KR101133384B1 - Jointing method - Google Patents

Abstract

It is a joining method which friction-stirres metal members with a joint member interposed, and provides the joining method which can improve the airtightness and water tightness of a metal member. The joining method which concerns on this invention is to the to-be-joined metal member 1 formed by fitting the joint member U1 to the hollow part which formed the 1st metal member 1a and the 2nd metal member 1b by the edge part. Is a joining method of moving the rotary tool G to perform friction stir welding. The surface joining step of performing friction stir from the surface A with respect to the front side butting portion J1, and the back side butting portion J2. Friction stir from the first side surface C with respect to the back side bonding step of performing friction stir from the back surface B and the second metal side joint butt portion J3 and the first metal side joint butt portion J4. It is characterized by including a side side joining process.

Description

Joining method {JOINTING METHOD}

This invention relates to the joining method of a metal member using friction stirring.

Friction stir welding (FSW = Friction Stir Welding) is known as a method of joining metal members. In friction stir welding, the metal members are joined together in solid phase by moving along the butt part of the metal members while rotating the rotary tool, and plastically flowing the metal of the butt part by frictional heat of the rotary tool and the metal member. Moreover, it is common for a rotating tool to protrude and provide a stirring pin (probe) in the lower end surface of the shoulder part which shows a cylinder shape.

42A and 42B are cross-sectional views showing a conventional joining method in which friction stir welding is performed on a pair of metal members. In the conventional joining method, first, as shown in FIGS. 42A and 42B, the end portions of the concave grooves 100a and the second metal member 101 cut out at the ends of the first metal member 100. The to-be-joined metal member 104 formed by fitting the joint member 103 is formed in the hollow part formed by the recessed grooves 100a and 101a so that the recessed groove 101a cut out in the back may be opposed. And friction stir welding is performed from the surface and the back surface of the butt | matching part 110 of the 1st metal member 100 and the 2nd metal member 101. FIG. This conventional joining method is described in Document 1.

FIG. 43 is a view showing a conventional joining method in which friction stir is performed stepwise through a joint member provided between a pair of metal members provided with stepped portions having different thicknesses, (a) before (b) ) Represents after conjugation.

As shown in FIGS. 43A and 43B, the first metal member 210a including the stepped portion 202 having a smaller thickness than the main body portion 201 at the edge portion of the main body portion 201 and A step of abutting the second metal member 210b with the stepped portions 202, a stepped friction stirring step of performing friction agitation with respect to the abutted portion Jd of the stepped portions, and a recess formed in the abutting process ( Joint member arranging process which arrange | positions the joint member U in 203, the butt | matching part Ja of the 1st metal member 210a and the joint member U, the 2nd metal member 210b, and the joint member U. It is provided with the friction stirring process of performing friction stirring with respect to the butt | matching part Jb of this. According to such a joining method, even if the member of the metal member has a large thickness, the metal members can be appropriately joined by performing friction stir welding step by step. This conventional joining method is described in Document 2.

In addition, as shown in FIG. 43 (b), when the airtightness and water tightness of the metal member are increased, friction agitating the butt portion Jc between the bottom surface of the joint member U and the bottom surface of the recess 203. It is desirable to. That is, the depth Wa of the plasticization area | region W formed by the said friction stirring process is set larger than the thickness Ua of the joint member U, and the rotary tool G is reciprocated several times, and the butt part ( Jc) is frictionally stirred over the entire surface. Thereby, the watertightness and airtightness of a metal member can be improved.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2004-167498 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-358535

However, like the conventional joining method shown in FIG. 42, when joining the edge parts of the 1st metal member 100 and the 2nd metal member 101 via the joint member 103, the 1st metal member ( Since the abutment portion 100b of the 100 and the joint member 103 and the abutment portion 101b of the second metal member 101 and the joint member 103 are exposed between both sides of the metal member 104 to be joined, There exists a problem that the watertightness and airtightness of the to-be-joined metal member 104 fall.

On the other hand, according to the conventional joining method shown in FIG. B (b), the larger the bottom area of the joint member U is, the larger the moving distance of the rotary tool G is, and thus there is a problem that the work becomes complicated. . Moreover, when the thickness Ua of the joint member U is larger than the depth Wa of the plasticization area | region W formed in the said friction stir process, the unfired area | region at the abutment part Ja, Jb, Jc is carried out. Since this has occurred, it was difficult to increase the watertightness and the airtightness of the metal member.

In view of the above, the present invention is a joining method of friction stiring metal members with a joint member interposed therebetween, and an object thereof is to provide a joining method capable of improving the airtightness and watertightness of the metal member.

The joining method which concerns on this subject is rotated to the to-be-joined metal member formed by inserting a joint member in the hollow part which formed the 1st metal member and the 2nd metal member which have a recessed groove in the edge part, and the said edge part formed. It is a joining method of carrying out a friction stir welding by moving a tool,

On the surface side joining process of performing friction stir from the surface of the to-be-joined metal member with respect to the butt | matching part of a said 1st metal member and a said 2nd metal member, and about the butt part of a said 1st metal member and a said 2nd metal member. A back side joining step of performing friction stir from the back surface of the metal member to be joined, an abutting portion of the first metal member and the second metal member, an abutting portion of the joint member and the first metal member, and a joint member; And a side-side joining step of performing friction stir from the side surface of the metal member to be joined to the butt portion of the second metal member.

According to this joining method, the front and back surfaces of the metal member to be joined are frictionally agitated, and the abutment portion of the first metal member and the second metal member exposed to the side surface of the metal member to be joined, the joint member, and the first member are exposed. The unfired region is sealed by performing friction stirring on the butt portion of the first metal member and the butt portion of the joint member and the second metal member. Thereby, the airtightness and water tightness of a to-be-joined metal member can be improved.

In addition, the joint member is inserted into the butt portion of the first metal member and the second metal member, and frictionally stirs the butt portion of the joint member and the first metal member and the butt portion of the joint member and the second metal member, thereby increasing the strength of the joint portion. It can increase.

Moreover, it is preferable that the plasticization area | region formed in the said front side joining process and the back side joining process, and the said joint member contact. According to such a joining method, since it can seal over the entire length of the butt | matching part of the 1st metal member and the 2nd metal member of a to-be-joined metal member, the quality of a product can further be improved.

Moreover, in the said side side joining process, it is preferable to friction stir the plasticization area | region formed in the said front side joining process and the back side joining process with the said rotary tool. According to such a joining method, since the plasticized region formed by the side joining process and the plasticized region formed in the said front side joining process and the back side joining process overlap, the quality of a product can be improved further.

In addition, the present invention provides a joint inserted into a hollow portion formed by abutting a first metal member and a second metal member having a concave groove in an end face, and an end face of the first metal member and one side surface of the second metal member. A joining method in which a friction stir welding is performed by moving a rotating tool to a joined metal member having a member, the first insertion step of inserting the joint member into the concave groove of the first metal member, and the first metal member. And the first main joining step of performing friction stir from the side surface of the first metal member, and the end face of the first metal member to face one side surface of the second metal member with respect to the butt portion of the joint member. A second insertion step of inserting the joint member into the concave groove of the second metal member, and an abutting portion between an end face of the first metal member and one side surface of the second metal member; 2nd main joining process which performs friction stirring from the surface and the back surface of a to-be-joined metal member, the abutment part of a said 1st metal member and a said 2nd metal member, and the abutment part of a said 2nd metal member and a said joint member. With respect to the third main joining step of performing friction stir from the end face of the second metal member and the abutment portion of the second metal member and the joint member, friction stir is performed from the other side of the second metal member. It comprises a 4th present bonding process performed.

According to this joining method, the front and back surfaces of the metal member to be joined are frictionally agitated, and the abutment portion of the first metal member and the second metal member exposed to the side surface of the metal member to be joined, the joint member, and the first member are exposed. The unfired region is sealed by performing friction stirring on the butt portion of the first metal member and the butt portion of the joint member and the second metal member. Thereby, the airtightness and water tightness of a to-be-joined metal member can be improved.

In addition, the joint member is inserted into the butt portion of the first metal member and the second metal member, and frictionally stirs the butt portion of the joint member and the first metal member and the butt portion of the joint member and the second metal member, thereby increasing the strength of the joint portion. It can increase.

In addition, the present invention provides a joint inserted into a hollow portion formed by abutting a first metal member and a second metal member having a concave groove in an end face, and an end face of the first metal member and one side surface of the second metal member. A joining method of performing friction stir welding by moving a rotary tool to a joined metal member having a member, comprising: a third insertion step of inserting the joint member into the concave groove of the second metal member; and the second metal member And a fourth main joining step of performing friction stir from the other side of the second metal member to the butt portion of the joint member, the butt portion of the first metal member and the second metal member, and the second metal. The third main joining step of performing friction stir from the end face of the second metal member to the butt portion of the member and the joint member, and the end face of the first metal member include the second metal. A fourth insertion step of inserting the joint member into the concave groove of the first metal member so as to face one side of the member, and the end face of the first metal member and one side of the second metal member 2nd main joining process which performs friction stirring with respect to the part from the surface and the back surface of the said to-be-joined metal member, and friction stirring from the side surface of the said 1st metal member with respect to the butt | matching part of the said 1st metal member and the said joint member. It is characterized by including the 1st main bonding process which performs the following.

According to this joining method, the front and back surfaces of the metal member to be joined are frictionally agitated, and the abutment portion of the first metal member and the second metal member exposed to the side surface of the metal member to be joined, the joint member, and the first member are exposed. The unfired region is sealed by performing friction stirring on the butt portion of the first metal member and the butt portion of the joint member and the second metal member. Thereby, the airtightness and watertightness between the both sides of a to-be-joined metal member can be improved.

In addition, the joint member is inserted into the butt portion of the first metal member and the second metal member, and frictionally stirs the butt portion of the joint member and the first metal member and the butt portion of the joint member and the second metal member, thereby increasing the strength of the joint portion. It can increase.

Moreover, in this invention, the plasticization area | region formed in the said 1st main bonding process, the plasticization area | region formed in the said 2nd main bonding process overlaps, and the said plasticization area | region formed in the said 2nd main bonding process, and the said 3rd It is preferable that the plasticized region formed in the present bonding step is overlapped, and the plasticized region formed in the third main bonding step overlaps with the plasticized region formed in the fourth main bonding step.

According to such a joining method, since the butt part is overlapped by overlapping the plasticized area | region formed by each joining process, the quality of a product can be improved further.

Moreover, this invention has the 1st metal member, the 2nd metal member, and the 3rd metal member which have a recessed groove in an end surface, and the joint member inserted into the said recessed groove, The said 1st metal member on both sides of the said joint member. And inserting the third metal member, and moving the rotating tool to the to-be-joined metal member having a T-shape in plan view formed by inserting a second metal member between the first metal member and the third metal member. A joining method for performing friction stir welding, comprising: a fifth insertion step of inserting the first metal member and the third metal member on both sides of the joint member, an abutting portion of the first metal member and the joint member, and the first agent; 5th main joining process which performs friction stirring with respect to the butt | matching part of 3 metal members and the said joint member from one side surface of the said joint member, and said 2nd in the said joint member A sixth insertion step of inserting the inner member, an end portion of the first metal member and one side surface of the second metal member, an abutment portion of the second metal member and the joint member, and the first A sixth main joining step of performing friction stir between the end face of the third metal member and the other side surface of the second metal member from the end face of the second metal member; and the end face of the first metal member and the Friction stirring is performed from the front and rear surfaces of the metal member to be joined to one of the side surfaces of the second metal member, and the end surface of the third metal member and the other side surface of the second metal member. A 7th main joining process of performing friction stir from the front and back surfaces of the said to-be-joined metal member with respect to a butt | matching part is characterized by the above-mentioned.

According to such a joining method, even a to-be-joined metal member having a T-shape in plan view formed by inserting the first metal member, the second metal member, the third metal member, and the joint member is exposed to the side surface of the metal member to be joined. By performing friction stirring on the butt portion, the watertightness and airtightness of the metal member to be joined can be improved. Moreover, the strength of a junction part can be raised by providing a joint member through friction and stirring-flush with respect to the butt | matching part of a joint member and each metal member.

Moreover, in this invention, the plasticization area | region formed in the said 5th main bonding process, the plasticization area | region formed in the said 6th main bonding process overlaps, and the plasticization area | region formed in the said 6th main bonding process, and the said 7th It is preferable to overlap the plasticized region formed in the present bonding step.

According to such a joining method, since the butt part is overlapped by overlapping the plasticized area | region formed by each joining process, the quality of a product can be improved further.

Moreover, this invention is the joining method of carrying out friction stir welding by moving a rotating tool with respect to the butt | matching part of two metal members, and the joint member interposed between the said metal member, and the butt | matching part of each said metal member, A step of joining the stepped portions of the two metal members including the stepped portion having a smaller thickness than the main body portion at an end portion of the main body portion to form a concave portion between the main body portions, and the surface of the stepped portion between the stepped portions. And a first step portion main joining step of performing friction stir from any one of the back surfaces, a joint member arranging step of inserting the joint member into the concave portion, and abutting the joint member to the main body portions, and the one metal described above. A first surface bone for performing friction stir from the surface with respect to the body portion of the member and the butt portion of the joint member. A joining step, a second surface main joining step of performing friction stir from the surface with respect to the abutment portion of the main body portion and the joint member of the other metal member, an abutting portion of one of the metal member and the joint member, And a side bone bonding step of performing friction stir from the side surface to the butt portion of the other metal member and the joint member, and overlapping the plasticized region formed in the first stepped bone bonding step and the side bone bonding step. And the plasticized areas formed in the first surface bone bonding step and the side bone bonding step, and the plasticized areas formed in the second surface bone bonding step and the side bone bonding step are overlapped.

According to such a joining method, the abutting part can be sealed by performing friction stirring from the side face to the abutting part exposed to the side face of the metal member and overlapping the plasticized regions formed in the respective main joining steps. Thereby, the airtightness and water tightness of a to-be-joined metal member can be improved.

Moreover, in this invention, the 2nd step part main joining process which carries out friction stir from the other of a front surface and a back surface with respect to the butt | matching part of the said stepped parts, The said 1st step part main joining process and the said 2nd Step Step It is preferable to overlap the plasticized region formed in the main bonding step.

According to such a joining method, since the butt | matching part of a step part is friction-stirred over the full length of a depth direction, it is possible to reliably seal the butt part.

Moreover, in this invention, it is preferable that the said side bone joining process performs friction stirring over the full length of the butt | matching part of the said step part.

According to such a joining method, in the side view joining process, it can seal more reliably by friction-stirring with respect to the unfired area | region of the butt | matching part of a step part.

Moreover, in this invention, in the plasticization area | region formed by the said 1st surface bone joining process and the said 2nd surface bone joining process, the tunnel shape cavity defect which communicates from one side surface to the other side surface has the said one metal member, and It is a case where it is formed in the said other metal member, and in the said side bone joining process, when making the said rotation tool turn right, the start position which concerns on the said side bone joining process so that the said joint member may be located to the left of the advancing direction. It is preferable to set the starting position regarding the side bone bonding step so that the joint member is located on the right side of the traveling direction when setting the, and rotating the rotary tool to the left.

Here, in the 1st surface bone joining process and the 2nd surface bone joining process, there exists a possibility that the tunnel-shaped cavity defect which communicates between both sides may be formed to the left of the advancing direction when the rotating tool rotates to the right, and to the right of the advancing direction when it is rotated to the left. . Such a cavity defect has become a factor which reduces the airtightness and water tightness of a metal member.

According to the joining method according to the present invention, however, the tunnel-shaped cavity defect can be appropriately sealed by setting the rotational direction and the starting position of the rotary tool in the side bone joining step in accordance with the position where the tunnel-shaped cavity defect is formed. .

Moreover, in this invention, in the plasticization area | region formed by the said 1st surface bone joining process and the said 2nd surface bone joining process, the tunnel-shaped cavity defect which communicates from one side surface to the other side surface is formed only in the said joint member, If the rotation tool is rotated to the right, the start position of the side bone bonding step is set such that the joint member is located on the right side of the moving direction, and the left side of the moving direction is left to rotate the rotary tool. It is preferable to set the starting position regarding the side bone bonding step so that the joint member is located at.

According to this joining method, the tunnel-shaped cavity defect can be appropriately sealed by setting the rotational direction and the starting position of the rotary tool in the side bone joining step in accordance with the position where the tunnel-shaped defect is formed.

According to the joining method which concerns on this invention, when carrying out friction stirring of metal members through a joint member, the airtightness and water tightness of a metal member can be improved.

1 is an overall perspective view showing a bonding method according to a first embodiment.
FIG. 2 is a diagram showing a butting step according to the first embodiment, (a) is a perspective view, and (b) is a side view. FIG.
It is a figure which shows the tab material arrangement process which concerns on 1st Embodiment, (a) is a perspective view, (b) is a top view of (a).
(A) is sectional drawing of the II line of FIG. 3 (b), (b) is sectional drawing of the II-II line of FIG.3 (b).
FIG. 5 is a view showing a rotary tool according to the first embodiment, (a) is a side view of the small rotary tool, and (b) is a side view of the large rotary tool.
FIG. 6 is a view showing a state of use of the small rotary tool according to the first embodiment, (a) is a diagram in which the small rotary tool is brought into contact with the first tab member, and (b) the small rotary tool is connected to the first tab member. It is a drawing pushed in.
FIG. 7: is a top view which shows the 1st tab material joining process of the 1st preliminary process which concerns on 1st embodiment, a provisional bonding process, and a 2nd tab material bonding process. FIG.
FIG. 8: is sectional drawing which showed the surface side joining process which concerns on 1st Embodiment in the direction of the III-III arrow of FIG. 7, (a) is a starting position part, (b) an intermediate part, and (c) an ending position. It is a figure which shows the friction stir welding of a part.
(A) is sectional drawing toward the 1st metal member 1a side from the surface side abutting part J1 after the to-be-joined metal member installation process of the 2nd preparation process which concerns on 1st Embodiment. (b) is a top view which shows the 2nd tab material joining process of the 2nd preliminary process which concerns on 1st Embodiment, the provisional bonding process, and the 1st tab material bonding process.
FIG. 10: is sectional drawing IV-IV line | wire of (b) of FIG. 9 which shows the back side joining process which concerns on 1st Embodiment, (a) is a starting position part, (b) is a friction stir welding of an intermediate part. Figure is shown.
FIG. 11 is a perspective view illustrating a state in which a tab material is removed after a back side bonding step.
12 is a diagram showing a first side-side bonding step in a first embodiment, wherein (a) is a first half portion and (b) is a plan view showing a second half portion.
FIG. 13 is an overall perspective view illustrating the bonding method according to the third embodiment. FIG.
14 is an exploded perspective view of the metal member to be joined according to the third embodiment.
FIG. 15 is a perspective view illustrating the joined metal member according to the third embodiment from three directions. FIG.
FIG. 16: is a figure which concerns on 3rd Embodiment, (a) is a perspective view which shows a 1st insertion process, (b) is a top view which shows the 1st main joining process. FIG.
FIG. 17 is a perspective view illustrating a second insertion step according to the third embodiment. FIG.
FIG. 18 is a view showing a second main junction according to a third embodiment, (a) is a plan view, and (b) is a VV line sectional view of (a). FIG.
FIG. 19 is a plan view illustrating a third main bonding step according to the third embodiment. FIG.
FIG. 20 is a plan view illustrating a fourth main bonding step according to the third embodiment. FIG.
Fig. 21 is a perspective view illustrating an example of friction stirring of the recessed corner portion according to the third embodiment.
Fig. 22 is a diagram according to a fourth embodiment, (a) is a perspective view showing a third insertion step, and (b) is a plan view showing a fourth main joining step.
FIG. 23 is a diagram according to a fourth embodiment, (a) is a side view showing a fourth insertion step, and (b) is a plan view showing a third main bonding step. FIG.
FIG. 24 is a diagram according to a fourth embodiment, (a) is a plan view showing the second main bonding step, and (b) is a sectional view taken along the line VI-VI of (a). FIG.
25 is a diagram illustrating a first main joining step according to a fourth embodiment, wherein (a) is a first joint butt joining step, (b) is a corner joining step, and (c) is a second joint. The butt joint joining process is shown.
It is a figure which shows the bonding method which concerns on 5th Embodiment, (a) is an overall perspective view, (b) is VII-VII line cross section of (a).
Fig. 27 is an exploded perspective view of the metal member to be joined according to the fifth embodiment.
FIG. 28 is a plan view illustrating a fifth main bonding step according to the fifth embodiment. FIG.
FIG. 29 is a plan view illustrating a sixth main bonding step according to the fifth embodiment. FIG.
30 is a plan view illustrating a seventh present bonding step according to the fifth embodiment.
FIG. 31 is an overall perspective view illustrating a bonding method according to a sixth embodiment. FIG.
FIG. 32 is a diagram illustrating a butt step in accordance with a sixth embodiment, (a) is a perspective view, (b) is a plan view, (c) is a sectional view taken along line II of (b), and (d) is a It is sectional drawing of the II-II line.
FIG. 33 is a plan view illustrating a first stepped temporary welding step according to a sixth embodiment. FIG.
(A) and (b) are sectional drawing which showed the 1st step part main bonding process which concerns on 6th Embodiment.
(A) and (b) are perspective views which show the joint member arrangement | positioning process which concerns on 6th Embodiment.
(A) is a top view of FIG. 35 (b), (b) is sectional drawing along the IV-IV line of (a).
FIG. 37 is a plan view illustrating a surface provisional bonding step according to a sixth embodiment. FIG.
38 is a plan view showing the surface-bonding step according to the sixth embodiment.
FIG. 39: is a top view which shows the 2nd step part main bonding process which concerns on 6th Embodiment. FIG.
(A) is a top view which shows the side bone joining process which concerns on 6th Embodiment, (b) is a top view which shows the side bone bonding process which concerns on 7th Embodiment.
FIG. 41: is a schematic perspective view which shows the joining method of this side bonding process, (a) is a 1st pattern, (b) is a figure which showed the 2nd pattern. FIG.
(A) and (b) are sectional drawing which shows the conventional joining method which carried out the friction stir welding to a pair of metal member.
Fig. 43 is a view showing a conventional joining method in which friction stir is performed step by step between a pair of metal members provided with stepped portions having different thicknesses, and (b) before joining (b). Shows after bonding.

[First Embodiment]

In the joining method according to the first embodiment, as shown in FIG. 1, the joint member U1 is inserted into a hollow portion formed to face the first metal member 1a and the second metal member 1b, The butt | matching part of the 1st metal member 1a, the joint member U1, the 2nd metal member 1b, and the joint member U1 is joined by friction stirring. It is characterized by the above-mentioned.

First, the to-be-joined metal member 1 of the joining method which concerns on this embodiment is demonstrated in detail, and the 1st tab material 2 and the 2nd tab material 3 used when joining this to-be-joined metal member 1 are mentioned. ) Will be described in detail.

As shown to (a) and (b) of FIG. 2, the to-be-joined metal member 1 is a pair of 1st metal member 1a by which recessed grooves ka and kb were formed in the edge part in this embodiment. And a joint member U (U1) inserted into the hollow portion formed by abutting the second metal member 1b and the first metal member 1a and the second metal member 1b.

The first metal member 1a has a rectangular shape when viewed in cross section, and a rectangular concave groove ka is formed in the end surface T1 when viewed in a cross section continuous from the first side surface 14a toward the second side surface 15a. Formed. The second metal member 1b is a metal member formed in a shape substantially equivalent to the first metal member 1a. The concave groove kb formed in the second metal member 1b is disposed to face the concave groove ka of the first metal member 1a, and the first metal member 1a and the second metal member 1b are disposed. ), The hollow part is formed.

The 1st metal member 1a and the 2nd metal member 1b are metal materials of the same composition in this embodiment, For example, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy The friction material is made of a metal material.

In addition, as shown in FIG. 1, the surface of the to-be-joined metal member 1 is surface A, the back surface B, the one side 1st side C, and the other side 2nd side ( It is called D). In addition, up, down, left, and right in front and back in this embodiment follow the arrow of FIG.

The joint member U1 is a rectangular parallelepiped forming a rectangle when viewed in cross section, and both end surfaces in the longitudinal direction of the joint member U1 have the same height as both side surfaces of the first metal member 1a and the second metal member 1b. It is formed so that it may become a surface. The height u ₁ of the joint member U1 is the height k ₁ of the concave groove ka of the first metal member 1a and the height k of the concave groove kb of the second metal member 1b. It is formed almost equal to ₃ ). In addition, the width u ₂ of the joint member U1 is formed almost equal to the sum of the width k ₂ of the concave groove ka and the width k ₄ of the concave groove kb. That is, the joint member U1 is inserted so that there is almost no gap in the hollow part of the to-be-joined metal member 1, as shown to FIG. 2 (b). In the present embodiment, the joint member U1 is made of the same material as the first metal member 1a.

As shown in FIG. 1 and FIG. 2B, a portion where the first metal member 1a and the second metal member 1b abut on the surface A side of the metal member 1 to be joined. Is called the surface side butting part J1. In addition, in the back surface B side of the to-be-joined metal member 1, the part which the 1st metal member 1a and the 2nd metal member 1b butted is called back surface side abutment part J2. In addition, in the 1st side surface C and the 2nd side surface D side, the part which the joint member U1 and the 2nd metal member 1b butted is called 2nd metal side joint abutting part J3. In addition, the part which the joint member U1 and the 1st metal member 1a butted is called 1st metal side joint abutting part J4.

The first tab member 2 and the second tab member 3, as shown in Figs. 2, 3 (a) and (b), are provided with the front side facing portion J1 and the rear surface of the metal member 1 to be joined. 1st metal member 1a and 1st which are arrange | positioned so that the side abutment part J2 may be interposed and are respectively affixed to the to-be-joined metal member 1 and exposed to the 1st side surface C and the 2nd side surface D. 2 A seam (boundary line) of the metal member 1b is covered and covered. Although there is no restriction | limiting in particular in the material of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, it is formed with the metal material of the same composition as the metal member 1 to be joined. The shape and dimensions of the first tab member 2 and the second tab member 3 are not particularly limited. However, in the present embodiment, the thickness of the metal member 1 to be joined in the surface-side butting part J1 is measured. It is made the same as the thickness dimension of.

Next, with reference to FIG. 5, the small rotating tool F (henceforth "small rotating tool F") used for friction stirring, and the large rotating tool G (henceforth a "large rotating tool ( G) ”will be described in detail.

The small rotating tool F shown in FIG. 5 (a) is made of a metal material harder than the metal member 1 to be joined such as tool steel, and has a shoulder portion F1 that exhibits a cylindrical shape, and the shoulder portion ( It is comprised and equipped with the stirring pin (probe) F2 protruded in the lower end surface F11 of F1). Although the dimension and shape of the small rotating tool F may be set according to the material, thickness, etc. of the to-be-joined metal member 1, the large rotating tool G used by the surface side joining process demonstrated later at least (FIG. 5) (refer to (b)). In this way, joining can be performed with a small load, and it becomes possible to reduce the load applied to the friction stirring device at the time of joining, and it can smoothly stir even in a relatively complicated path. Moreover, since it becomes possible to make the moving speed (feed speed) of the small rotary tool F faster than the moving speed of the large rotary tool G, it becomes possible to reduce the work time and cost required for joining.

The lower end surface F11 of the shoulder part F1 is a site | part which plays a role which prevents scattering to the circumference by pressing the plastically fluidized metal, and is molded in concave shape in this embodiment. There are no particular limitations on the size of the outer diameter (X ₁₎ of the shoulder portion (F1), in the present embodiment is smaller than the outer diameter (Y ₁₎ of the shoulder portion (G1) of a large rotating tool (G).

The stirring pin F2 hangs from the center of the lower end surface F11 of the shoulder part F1, and is shape | molded by the truncated truncated cone shape in this embodiment. Moreover, the stirring blade engraved in helical shape is formed in the circumferential surface of the stirring pin F2. Stirring particular limitation to the size of the outer diameter of the pin (F2), but, in the present embodiment, the maximum outer diameter of the maximum outside diameter (top end diameter) (X ₂₎ is stirred in a large rotating tool (G) pin (G2) (an upper end diameter) ( Y ₂ ), and the minimum outer diameter (lower end diameter) X ₃ is smaller than the minimum outer diameter (lower end diameter) Y ₃ of the stirring pin G2. Stirring pin (F2) the length (L _2), the length of the stirring pins (G2) of a large rotating tool (G) (L ₁₎ [see Figure 5 (b)] is preferred to be smaller than the.

The large rotary tool G shown in FIG. 5B is made of a metal material harder than the metal member 1 to be joined such as tool steel, and has a shoulder portion G1 that exhibits a cylindrical shape, and the shoulder portion ( The stirring pin (probe) G2 protruded and provided in the lower end surface G11 of G1 is comprised.

The lower end surface G11 of the shoulder part G1 is shape | molded in concave shape similarly to the small rotating tool F. As shown in FIG. The stirring pin G2 hangs from the center of the lower end surface G11 of the shoulder part G1, and is shape | molded by the truncated truncated cone shape in this embodiment. Moreover, the stirring blade engraved in the spiral shape is formed in the peripheral surface of the stirring pin G2.

Hereinafter, the bonding method which concerns on this embodiment is demonstrated in detail. The joining method which concerns on this embodiment is (1) 1st preparatory process, (2) 1st preliminary process, (3) surface side joining process, (4) 2nd preparatory process, (5) 2nd preliminary process, ( 6) back side joining process, (7) tap material cutting process, (8) 3rd preparation process, (9) 1st side side bonding process, (10) 4th preparation process, (11) 2nd side side bonding process, (12) It includes a tab cutting process.

(1) 1st preparation process

A first preparation step will be described with reference to FIGS. 2 to 4. The 1st preparation process is a process of preparing the contact member (1st tap material 2 and 2nd tap material 3) in which the start position and end position of friction stirring of the to-be-joined metal member 1 are formed. In this embodiment, the first preparatory step is a butt step of facing the first metal member 1a and the second metal member 1b and inserting the joint member U1 into the hollow portion, and of the metal member 1 to be joined. A tab member arranging step of arranging the first tab member 2 and the second tab member 3 on both sides of the surface side butting part J1, and the first tab member 2 and the second tab member 3 to be joined by welding. The provisional welding process which temporary-joins a metal member 1, and the to-be-joined metal member installation process which installs the to-be-joined metal member 1 to a friction stirring apparatus are provided.

(1-1) Butt Process

In the butt step, as shown in FIGS. 2 and 3, the end face T2 of the second metal member 1b is brought into close contact with the end face T1 of the first metal member 1a, and the concave groove ka , the joint member U1 is inserted into the hollow portion formed by kb).

In addition, as shown in FIG. 4 etc., the surface 12a of the 1st metal member 1a and the surface 12b of the 2nd metal member 1b are made into the surface of the same height, and also the 1st metal member 1a is made. The back surface 13a of the and the back surface 13b of the 2nd metal member 1b are made into the surface of the same height. In addition, similarly, the first side surface 14a of the first metal member 1a and the first side surface 14b of the second metal member 1b are set to have the same height, and the second side of the first metal member 1a is provided. The side surface 15a and the second side surface 15b of the second metal member 1b are the surfaces of the same height.

(1-2) Tap Repositioning Process

In the tab member arrangement step, as shown in FIGS. 2A and 2B, the first tab member 2 is disposed along the surface side abutting portion J1 on the second side surface D side, and the contact surface thereof is disposed. Contact to the second side (D). Moreover, the 2nd tab material 3 is arrange | positioned at the 1st side surface C along the surface side butt | matching part J1, and the contact surface is made to contact the 1st side surface C. As shown in FIG. At this time, as shown in FIG. 4B, the surface 22 of the first tab member 2 and the surface 32 of the second tab member 3 are separated from the surface A of the metal member 1 to be joined. The back surface 23 of the first tab member 2 and the back surface 33 of the second tab member 3 are the same height as the back surface B of the metal member 1 to be joined. do.

(1-3) Fusible Welding Process

In the tack welding step, as shown in Figs. 3A and 3B, the corner portions 2a and 2b formed by the metal member 1 to be joined and the first tab member 2 are welded and joined. The metal member 1 and the first tab member 2 are temporarily joined. Moreover, the corner part 3a, 3b formed by the to-be-joined metal member 1 and the 2nd tab material 3 is welded, and the to-be-joined metal member 1 and the 2nd tab material 3 are temporarily joined.

In addition, welding may be performed continuously over the entire length of the indented corner portions 2a, 2b, and 3a, 3b, or may be interrupted and welded. In addition, in the 1st preparation process, when abbreviate | occur | producing a welding process, you may perform the butt process and the tab material arrangement process on the mount of a friction stirring apparatus not shown.

(1-4) Process of installing metal member to be joined

In the to-be-joined metal member attachment process, the to-be-joined metal member 1 is fixed to the mount of the friction stirring apparatus which is not shown in figure so that the surface A of the to-be-joined metal member 1 may face upward. In addition, in this embodiment, friction stirring shall be performed from above the mount.

(2) first preliminary step

The 1st preliminary process is a process performed before a surface side joining process, In this embodiment, the butt | matching part j2 of the to-be-joined metal member 1 and the 1st tab material 2 is carried out in the surface A side. Joining process of the first tab material to be joined, temporary joining process of temporarily joining the surface side butting part J1 of the to-be-joined metal member 1, and butt part of the to-be-joined metal member 1 and the 2nd tab material 3 2nd tab material joining process which joins (j3), and the lower hole formation process which forms a lower hole in the starting position of friction stirring in a surface side joining process.

In the first preliminary step, as shown in FIG. 7, one small rotary tool F is moved to form a movement trajectory (bead) of one brush stroke, and continuous with respect to the butt portions j2, J1, j3. Friction stirring. That is, the stirring pin F2 (refer FIG. 5 (a)) of the small rotating tool F inserted in the starting position S _P1 of friction stirring is moved to the end position E _P1 without deviating in the middle. . In addition, in this embodiment, although the start position S _P1 of friction stirring is provided in the 1st tab material 2 and the end position E _P1 is provided in the 2nd tab material 3, the start position S _P1 It is not intended to limit the positions of the and end positions E _P1 . In addition, in this embodiment, all the rotation directions of the small rotating tool F and the large rotating tool G shall perform right rotation. In this way, by unifying the rotation directions of the small rotary tool F and the large rotary tool G, the labor of the work can be saved.

The sequence of friction stirring in the 1st preliminary process of this embodiment is demonstrated in detail with reference to FIG. 6 and FIG.

First, a first small rotation tool place to position the miniature rolling tool (F) directly on top of a starting position (S _P1) installed on, and subsequently the taepjae 2, as shown in Figure 6 (a) ( to turn right while lowering the F) and pressure in the stirring pins (F2) to the starting position (S _P1). Although the rotation speed of the small rotating tool F is set according to the dimension and shape of the stirring pin F2, the material, thickness, etc. of the to-be-joined metal member 1 etc. which are friction-stirred, most are 500-2000 (rpm) It is set in the range of.

When the stirring pin F2 is in contact with the surface 22 of the first tab member 2, the metal around the stirring pin F2 is plasticized and fluidized by frictional heat, as shown in Fig. 6B. , The stirring pin F2 is inserted into the first tab member 2.

When the whole of the stirring pin F2 enters the 1st tap material 2, and the whole surface of the lower end surface F11 of the shoulder part F1 contacts the surface 22 of the 1st tap material 2, FIG. As shown in the figure, while rotating the small rotary tool F, it is relatively moved toward the start point s2 of the first tab member bonding step.

Although the moving speed (feeding speed) of the small rotating tool F is set according to the dimension and shape of the stirring pin F2, the material, thickness, etc. of the to-be-joined metal member 1, which are friction-stirred, most are 100-100 It is set in the range of 1000 (mm / min). The rotational speed at the time of the movement of the small rotating tool F is equal to or lower than the rotational speed at the time of insertion. In addition, when moving the small rotating tool F, the axis line of the shoulder part F1 may be inclined a little to the rear side of the advancing direction with respect to a perpendicular line, but when making it perpendicular without making it incline, the direction change of the small rotating tool F will be made. It becomes easy and complex movement becomes possible. When the small rotary tool F is moved, the metal around the stirring pin F2 is plastically fluidized in turn, and the metal which was plastically fluidized is hardened again at the position away from the stirring pin F2.

When the small rotary tool F is relatively moved and friction stir is performed continuously to the start point s2 of the first tap material joining process, the first tap material joining process is performed as it is without leaving the small rotary tool F at the start point s2. To fulfill.

(2-1) First Tab Material Bonding Step

In the first tab member joining step, friction stirring is performed on the butt portion j2 between the first tab member 2 and the metal member 1 to be joined. Specifically, the abutment part is formed by setting a route of friction stir on the joint (boundary line) of the to-be-joined metal member 1 and the 1st tab material 2, and moving the small rotating tool F relatively along the said route. Friction stirring is performed for j2). In addition, in this embodiment, friction stirring is performed continuously from the start point s2 of the 1st tap material joining process to the end point e2, without leaving small-sized rotating tool F in the middle.

In addition, when the small rotating tool F is rotated to the right, since there is a possibility that a fine cavity defect may occur on the left side of the small rotating tool F in the advancing direction, the metal to be joined to the right side of the small rotating tool F in the advancing direction. It is preferable to set the position of the start point s2 and the end point e2 of a 1st tab material joining process so that the member 1 may be located. In this case, since a cavity defect is less likely to occur on the side of the metal member 1 to be joined, a high quality joined body can be obtained.

Incidentally, when the small rotary tool F is rotated to the left, there is a possibility that a fine cavity defect may occur on the right side in the travel direction of the small rotary tool F. Therefore, the left side of the small rotary tool F is joined to the left in the travel direction. It is preferable to set the positions of the start point and the end point of the first tab material joining process so that the metal member 1 is located. Although illustration is abbreviate | omitted specifically, a starting point is provided in the position of the end point e2 when the small rotating tool F is rotated to the right, and it is located in the position of the starting point s2 when the small rotating tool F is rotated to the right. It is good to have an end point.

Moreover, when the stirring pin F2 of the small rotary tool F enters the butt | matching part j2, although the force which tries to isolate | separate the to-be-joined metal member 1 and the 1st tab material 2 acts, the to-be-joined metal member Since the corner parts 2a and 2b (refer FIG. 3) which were formed by (1) and the 1st tab material 2 are temporarily joined by welding, between the to-be-joined metal member 1 and the 1st tab material 2 There is no occurrence of gap in.

(2-2) Temporary Bonding Process

When the small rotary tool F reaches the end point e2 of the first tap material joining step, the friction stir is continuously performed to the start point s1 of the temporary joining step without ending the friction agitation at the end point e2, and then Transfer to the bonding process. That is, friction stirring is continued from the end point e2 of a 1st tap material joining process to the start point s1 of a provisional bonding process, without leaving the small rotating tool F, and at the starting point s1, the small rotating tool F is carried out. The process proceeds to the temporary bonding process without deviating. By doing in this way, the detachment | work operation of the small rotating tool F in the end point e2 of a 1st tab material joining process becomes unnecessary, and the insertion work of the small rotating tool F in the starting point s1 of a temporary joining process is no longer performed. Since it becomes unnecessary, the efficiency of preliminary joining operation | work and speed can be aimed at.

In this embodiment, the route of friction stirring from the end point e2 of the first tap material joining step to the start point s1 of the provisional joining step is set in the first tap material 2, and the small rotary tool F is set to the first. The movement trace at the time of moving from the end point e2 of a tab material joining process to the start point s1 of a provisional joining process is formed in the 1st tab material 2. In this case, in the process from the end point e2 of the first tab member joining step to the start point s1 of the provisional joining step, it is difficult for the joint defect to occur in the joined metal member 1, whereby a high quality joined body can be obtained. have.

In the provisional bonding process, friction stir is performed with respect to the surface side abutment part J1 (refer FIG. 7) of the to-be-joined metal member 1. Specifically, the route of friction stir is set on the joint (boundary line) of the to-be-joined metal member 1, and the total length of the surface side butt | matching part J1 is made by relatively moving the small rotating tool F along the said route. Friction stirring is performed continuously over. In addition, in this embodiment, friction stirring is performed continuously from the start point s1 of the temporary joining process to the end point e1, without leaving the small rotating tool F in the middle.

When the small rotary tool F reaches the end point e1 of the provisional joining process, friction stirring is continuously performed to the start point s3 of the second tap material joining process without terminating the friction agitation at the end point e1, and the 2 We move to tap material joining process. That is, friction stirring is continued from the end point e1 of the provisional joining process to the start point s3 of the 2nd tap material joining process, without leaving the small rotating tool F, and the small rotating tool F at the starting point s3. It moves to a 2nd tab material joining process, without leaving this.

In this embodiment, the route of friction stirring which reached the starting point s3 of the 2nd tap material joining process from the end point e1 of the provisional joining process is set to the 2nd tap material 3, and the temporary rotation tool F is temporarily joined. The movement trace at the time of moving from the end point e1 of a process to the start point s3 of a 2nd tap material joining process is formed in the 2nd tab material 3. In this way, in the process from the end point e1 of the provisional joining step to the start point s3 of the second tab material joining step, it is difficult for the joint defect to occur in the metal member 1 to be joined, whereby a high quality joined body can be obtained. have.

(2-3) 2nd tap material joining process

In the second tab member joining step, friction stirring is performed on the butt portion j3 between the metal member 1 to be joined and the second tab member 3. Specifically, a butt portion is formed by setting a route of friction stir on the joint (boundary line) of the to-be-joined metal member 1 and the second tab member 3 and moving the small rotating tool F along the route. Friction stirring is performed for j3). In addition, in this embodiment, friction stirring is performed continuously from the start point s3 of the 2nd tap material joining process to the end point e3, without leaving small-sized rotating tool F in the middle.

In addition, since the small rotating tool F is rotated to the right, the start point s3 and the end point e3 of the second tab material joining process are positioned so that the metal member 1 to be joined is located on the right side in the advancing direction of the small rotating tool F. Set the position of.

Moreover, when the stirring pin F2 of the small rotary tool F enters the butt | matching part j3, the force which tries to isolate | separate the to-be-joined metal member 1 and the 2nd tab material 3 acts, but the to-be-joined metal member Since the corner parts 3a and 3b (refer FIG. 3) which entered 1 and 2nd tab material 3 are temporarily joined by welding, they spread between the metal member 1 and the 2nd tab material 3 to be joined. This never happens.

When the small rotary tool F reaches the end point e3 of the second tap material joining step, the end point e3 is continuous to the end position E _P1 provided in the second tap material 3 without terminating the friction agitation. Friction stirring. In addition, in this embodiment, the end position E _P1 is provided on the extension line of the seam (boundary line) shown on the surface A side of the to-be-joined metal member 1. Incidentally, the end position E _P1 is also the start position S _M1 of friction stir in the surface side joining step described later.

When the small rotary tool F reaches the end position E _P1 , the small rotary tool F is raised while rotating the small rotary tool F to release the stirring pin F2 from the end position E _P1 .

As mentioned above, although the 1st tab material joining process, the temporary joining process, and the 2nd tab material joining process were demonstrated, the trace in each joining process is an illustration to the last and may be another form. In addition, you may abbreviate | omit the 1st tab material bonding process and the 2nd tab material bonding process, and may perform only a temporary bonding process.

(2-4) lower hole forming process

Subsequently, a lower hole forming step is performed. The lower hole formation process is a process of forming lower hole P1 in the starting position of friction stirring in a surface side joining process, as shown to FIG. 5 (b). In the lower hole formation process which concerns on a 1st preliminary process, the lower hole P1 is formed in the starting position S _M1 set in the surface 32 of the 2nd tab material 3.

The lower hole P1 is provided for the purpose of reducing the insertion resistance (pressing resistance) of the stirring pin G2 of the large rotary tool G. In this embodiment, the stirring pin F2 of the small rotary tool F is provided. It is formed by expanding the diameter with the drill etc. which do not show the hollow hole H1 formed at the time of leaving (refer FIG. 5 (a)). When the empty hole H1 is used, the formation process of the lower hole P1 can be simplified, and work time can be shortened. Although there is no restriction | limiting in particular in the form of lower hole P1, In this embodiment, it is set as cylindrical shape. In addition, although the lower hole P1 is formed in the 2nd tab material 3 in this embodiment, there is no restriction | limiting in particular in the position of the lower hole P1, You may form in the 1st tap material 2, Although it may be formed in j2, j3, it is suitably formed on the extension line of the seam (boundary line) of the to-be-joined metal member 1 shown in the surface A side of the to-be-joined metal member 1 like this embodiment. It is preferable.

In addition, in this embodiment, the case where the hollow hole H1 of the stirring pin F2 (refer FIG. 5 (a)) of the small rotating tool F is expanded and made into the lower hole P1 was illustrated, The maximum outer diameter X ₂ of the stirring pin F2 is larger than the minimum outer diameter Y ₃ of the stirring pin G2 of the large rotary tool G, and the maximum outer diameter X ₂ of the stirring pin F2 is stirred. In the case of (Y ₃ <X ₂ <Y ₂ ) smaller than the maximum outer diameter Y ₂ of the fin G2, the empty hole H1 of the stirring pin F2 may be used as the lower hole P1 as it is.

(3) surface side bonding process

The surface side joining process is a process of joining the surface side butt | matching part J1 in the surface A side of the to-be-joined metal member 1 in earnest. In the surface side joining process which concerns on this embodiment, using the large rotating tool G shown to Fig.5 (b), it is the metal member 1 to be joined with respect to the surface side butt | matching part J1 of the temporary welding state. Friction agitation is performed from the surface A side of the substrate.

In the surface side joining process, as shown to (a)-(c) of FIG. 8, the stirring pin G2 of the large rotating tool G is attached to the lower hole P1 formed in the starting position S _M1 . It inserts (presses in) and moves the inserted stirring pin G2 to the end position E _M1 without detaching it halfway. That is, in the surface side joining process, friction stirring is started from lower hole P1 and friction stirring is performed continuously to the end position E _M1 .

Here, at the starting point which completed the said 1st preliminary process, the friction stirring apparatus provided with the small rotating tool F is located directly above the end position E _P1 of the 2nd tap material 3 (refer FIG. 7). Therefore, if the start position of the surface side joining process is set to S _M1 , the surface side joining process can be performed without moving the friction stirring device provided with the large rotary tool G, and the work can be simplified.

In addition, in this embodiment, although the starting position S _M1 of friction stirring is provided in the 2nd tab material 3 and the ending position E _M1 is provided in the 1st tap material 2, the starting position S _M1 It is not intended to limit the positions of the and end positions E _M1 .

The surface side joining process is demonstrated in more detail with reference to FIG.8 (a)-(c).

First, as shown to Fig.8 (a), the large rotating tool G is located just above the lower hole P1 (starting position S _M1 ), and then the large rotating tool G is rotated rightward. While lowering, the tip of the stirring pin G2 is inserted into the lower hole P1. When the stirring pin G2 enters the lower hole P1, the circumferential surface (side surface) of the stirring pin G2 contacts the hole wall of the lower hole P1, and the metal plastically fluidizes from the hole wall. In such a state, since the plasticized fluidized metal is pushed out from the peripheral surface of the stirring pin G2, the stirring pin G2 is press-fitted, and it becomes possible to reduce the indentation resistance in the press-fitting initial stage. In addition, before the shoulder portion G1 of the large rotary tool G contacts the surface 32 of the second tab member 3, the stirring pin G2 contacts the hole wall of the lower hole P1, so that the frictional heat is reduced. Since it arises, it becomes possible to shorten the time until plastic fluidization. That is, it becomes possible to reduce the load of the friction stir device, and further shorten the work time required for the present bonding.

When the whole of the stirring pin G2 enters the 2nd tap material 3 and the whole surface of the lower end surface G11 of the shoulder part G1 contacts the surface 32 of the 2nd tap material 3, FIG. As shown in (b) of FIG. 2, the large rotary tool G is relatively moved toward one end of the surface-side butting portion J1 of the metal member 1 to be joined while performing friction stir, and the butting portion j3 ) Is crossed to the surface side butting portion J1. When the large rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in turn, and at the position away from the stirring pin G2, the metal that has been plastically fluidized again is cured and plasticized area. (Hereinafter, referred to as "surface side plasticized region W1") is formed. In addition, the plasticization area shall include both the state heated by the frictional heat of the rotary tool and actually plasticized, and the state in which the rotary tool has passed excessively and returned to normal temperature.

The depth Wa of the surface side plasticization area | region W1 becomes larger than the distance u _a from the surface A of the to-be-joined metal member 1 to the upper surface of the joint member U1 in this embodiment. It is preferable to form so that. That is, by bringing the surface side plasticized area | region W1 into contact with the joint member U1, friction agitation can be performed over the entire length of the surface side butt | matching part J1 in the depth direction, and the quality of a product can further be improved. .

Although the moving speed (feeding speed) of the large rotary tool G is set according to the dimension and shape of the stirring pin G2, the material, thickness, etc. of the to-be-joined metal member 1 friction-stirred, most are 30- It is set in the range of 300 (mm / min).

When there exists a possibility that the heat input amount to the to-be-joined metal member 1 may become excessive, it is preferable to cool by supplying water from the surface A side to the circumference | surroundings of the large rotary tool G. Moreover, when coolant enters between the 1st metal member 1a and the 2nd metal member 1b, there exists a possibility that an oxide film may generate | occur | produce on a joining surface (end surface T1, T2, see FIG.3 (b)). However, in this embodiment, since the joint is closed by performing a temporary joining process, it is difficult for cooling water to enter between the to-be-joined metal members 1, and there exists no possibility of deteriorating the quality of a junction part.

In the surface-side butt | joint part J1 of the to-be-joined metal member 1, the route of friction stirring is set to the seam phase (the moving trace image in a temporary joining process) of the to-be-joined metal member 1, By relatively moving the large rotary tool G, friction stirring is performed continuously from the one end part of the surface side butt | matching part J1 to the other end part. When the large rotary tool G is relatively moved to the other end of the surface-side butting part J1, the abutting part j2 is traversed while performing friction agitation, and is relatively moved toward the end position E _{M1 as} it is.

In addition, in this embodiment, since the starting position S _M1 of friction stirring is set on the extension line of the seam (boundary line) of the to-be-joined metal member 1 exposed to the surface A side of the to-be-joined metal member 1, The route of friction stirring in the surface side joining process can be straightened. If the route of the friction stirring is in a straight line, the movement distance of the large rotary tool G can be kept to a minimum, so that the surface side joining process can be performed efficiently, and it is possible to reduce the amount of wear of the large rotary tool G. It becomes possible.

When the large rotating tool G reaches the end position E _M1 , as shown in FIG. 8C, the large rotating tool G is raised while rotating the large rotating tool G to move the stirring pin G2 to the ending position E. FIG. _M1 ) (see FIG. 8B). In addition, when the stirring pin G2 is separated upward in the end position E _M1 , the hollow hole Q1 which is almost the same shape as the stirring pin G2 is inevitably formed, but is left as it is in this embodiment. .

The rotation speed (rotation speed at the time of departure) of the large rotation tool G at the time of leaving the stirring pin G2 of the large rotation tool G from the end position E _M1 is higher than the rotation speed at the time of movement. It is desirable to. In this way, since the separation resistance of the stirring pin G2 becomes small compared with the case where the rotational speed at the time of departure is the same as the rotational speed at the time of movement, the stirring pin G2 in the end position E _M1 It is possible to quickly perform the detachment work.

In addition, in this embodiment, although the 1st preliminary process was performed before the surface side joining process, you may skip the 1st preliminary process and perform a surface side joining process immediately after a 1st preparatory process.

(4) 2nd preparation process

The second preparation step is a preparation step performed before the second preliminary step. In this embodiment, the back surface B side of the to-be-joined metal member 1 faces upward, and the to-be-joined metal member attachment process which installs again in a friction stirring apparatus not shown is provided.

(4-1) Process of installing metal member to be joined

In the to-be-joined metal member installation process, after canceling the restraint of the to-be-joined metal member 1 which finished the surface side joining process, the front and back of the to-be-joined metal member 1 are reversed, and the back surface B side is turned upwards. And reattach to the mount of the friction stir device. In this embodiment, the to-be-joined metal member 1 is rotated half around the front-back axis shown in FIG. 1, and the front and back of the to-be-joined metal member 1 are reversed.

Here, FIG. 9 (a) is sectional drawing toward the 1st metal member 1a side from the surface side abutting part J1 after the to-be-joined metal member installation process of the 2nd preparation process which concerns on 1st Embodiment. As shown to Fig.9 (a), in the to-be-joined metal member installation process, the upper surface of the to-be-joined metal member 1 turns into a back surface B, and the 1st metal from the surface side butt | matching part J1 side. When it faces the member 1a, the 2nd tap material 3 is located in the left side of the to-be-joined metal member 1, and the 1st tap material 2 is located in the right side.

In addition, depending on the friction stirring device, the front and back may be rotated without releasing the restraint of the metal member 1 to be joined.

(5) second preliminary step

A 2nd preliminary process is a process performed before a back surface side joining process, The 2nd which joins the butt | matching part j3 of the to-be-joined metal member 1 and the 2nd tab material 3 in the back surface B side. The tab material joining step, the temporary joining step of temporarily joining the back side side abutting part J2 of the to-be-joined metal member 1, and the abutting part j2 of the to-be-joined metal member 1 and the first tab member 2 are performed. The 1st tab material joining process to bond and the lower hole formation process of forming a lower hole in the starting position of friction stirring in a back side joining process are provided.

(5-1) Second Tab Material Bonding Step, (5-2) Temporary Bonding Step and (5-3) First Tab Material Bonding Step

(5-1) The second tab material joining step, the (5-2) temporary joining step, and (5-3) the first tab material joining step are the (2-3) second tab material joining step according to the first preliminary step described above. , (2-2) provisional bonding step and (2-1) first tab material bonding step are almost the same process. As shown in FIG. 9 (b), one small rotary tool F is moved to form a movement trajectory (bead) of one brush drawing, and is continuously operated in the order of the abutting parts j3, J2, j2. Friction stirring is performed. That is, the stirring pin F2 (refer to FIG. 5 (a)) of the small rotary tool F inserted in the starting position S _P2 of friction stirring is moved to the end position E _P2 without deviating in the middle. , (5-1) Second tap material joining step, (5-2) Temporary joining step, and (5-3) First tap material joining step are continuously performed. In addition, the end position E _P2 becomes the start position S _M2 of the back surface joining process performed next.

Here, in a 1st preliminary process, as shown in FIG. 7, (2-1) 1st tab material joining process, (2-2) provisional bonding process, and (2-3) agent from the 1st tab material 2 side The two-tap material joining step was performed in sequence. On the other hand, in the 2nd preliminary process, when it goes to the 1st metal member 1a side from the back surface side abutting part J2, the 2nd tab material 3 will be located on the left side of the to-be-joined metal member 1, and it will be the surface side. Since the friction stirring device provided with the large rotary tool G is located above the 2nd tap material 3 at the starting point which completed the joining process, it is (2-1) 2nd tap material joining process from the 2nd tap material 3 side. , (5-2) temporary bonding step and (5-3) first tab material bonding step are performed in this order. In this case, since the moving distance of the friction stirring apparatus provided with the small rotating tool F becomes small, the labor of a work can be saved.

In addition, detailed description of the (5-1) 2nd tab material joining process, (5-2) provisional bonding process, and (5-3) 1st tab material joining process is substantially the same as a 1st preliminary process, and it abbreviate | omits.

(5-4) lower hole forming process

The lower hole formation process is a process of forming lower hole P2 in the starting position S _M2 of friction stirring in a back side joining process, as shown to FIG. 10 (a). That is, the lower hole forming step is a step of forming the lower hole P2 at a position where the stirring pin G2 of the large rotary tool G is to be inserted. Thereby, insertion resistance (pressing resistance) of the stirring pin G2 of the large rotating tool G can be reduced.

In addition, since the lower hole formation process (5-4) is substantially the same as the lower hole formation process (2-4) which concerns on a 1st preliminary process, detailed description is abbreviate | omitted.

(6) Back side joining process

A back surface side joining process is a process of joining the back surface side facing part J2 in the back surface B side of the to-be-joined metal member 1 in earnest. In the back side joining process which concerns on this embodiment, it uses the large rotary tool G, and it frictions from the back surface B side of the to-be-joined metal member 1 with respect to the back side butt | matching part J2 of the temporary welding state. Stirring is performed.

As shown in (a) and (b) of FIG. 10, the back side bonding step is a stirring pin G2 of the large rotary tool G in S _M2 set on the back surface 23 of the first tab member 2. Is inserted (press-in), and the inserted stirring pin G2 is moved to the end position E _M2 without detaching it halfway. In the back surface joining process, friction stirring is started from the lower hole P2, and friction stirring is performed continuously to the end position E _M2 . When the large rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in turn, and at the position away from the stirring pin G2, the metal that has been plastically fluidized again is cured and plasticized area. (Hereinafter, referred to as "back side plasticized region W2") is formed.

In this embodiment, the depth Wa of the back surface side plasticization area | region W2 becomes larger than the distance u _a from the back surface B of the to-be-joined metal member 1 to the upper surface of the joint member U1. It is preferable to form so that. That is, by bringing the back side plasticized area | region W2 into contact with the joint member U1, friction stirring can be performed over the full length of the back side butt | matching part J2 in the depth direction, and the quality of a product can be improved much further. .

Here, in the starting point which finished the 2nd preliminary process, the friction stirring apparatus provided with the small rotating tool F was immediately above the end position E _P2 of the 1st tab material 2 (refer FIG. 9 (b)). Since the starting position S _M2 of the back side joining process is set above the first tab member 2, the front side joining process is performed without moving the friction stir device with the large rotary tool G. It can be done, and the effort of work can be saved.

In addition, about a back side bonding process, since it is substantially the same as a surface side bonding process, detailed description is abbreviate | omitted. In addition, in this embodiment, although the 2nd preliminary process was performed, you may abbreviate | omit the 2nd preliminary process and may perform a back surface joining process immediately after a surface side joining process.

(7) tapping material cutting process

In the tab member cutting step, the first tab member 2 and the second tab member 3 are removed from the metal member 1 to be joined. In this embodiment, the to-be-joined metal member 1 which completed the back surface side joining process is once removed from the mount of a friction stirring apparatus, and the 1st tab member (2) is joined along the abutting parts j2 and j3 using the cutting mechanism which is not shown in figure. 2) and the 2nd tab material 3 are excised.

FIG. 11 is a perspective view showing a state in which a tab material is removed after the back side bonding step in the first embodiment. FIG. As shown in FIG. 11, the surface side plasticization area | region W1 and the back surface side plasticization area | region W2 are formed continuously from the 1st side surface C side to the 2nd side surface D side.

Here, the surface-side small flame region (W1) and the back side small flame region (W2), the traveling direction of the large rotating tool (G) (see the arrow V _1, V ₂₎ the left side, that is, the second metal member (1b) Therefore, there is a possibility that a tunnel shape cavity defect (not shown) that is continuous from the first side C side to the second side D side occurs.

Moreover, the oxide film which is not shown in figure may be wound in the both ends of surface side plasticization area | region W1 and back surface plasticization area | region W2. An oxide film is formed by winding the oxide film formed in the 1st side surface C and the 2nd tab material 3, the 2nd side surface D, and the 1st tab material 2 inside the to-be-joined metal member 1. Will be.

Therefore, when a tunnel-shaped cavity defect and an oxide film are formed, you may weld and perform the repair process which fills these defects (gaps) with a weld metal.

(8) 3rd preparation process

The 3rd preparation process is a process performed before a 1st side side joining process, The 1st tab material 2 and the 2nd tab material 3 in which the start position and end position of friction stirring of the to-be-joined metal member 1 are provided are provided. ) Is the process of preparing. The third preparation step includes a tab member arrangement step of arranging the first tab member 2 and the second tab member 3 on the surface A and the rear surface B of the metal member 1 to be joined, Temporary welding step of temporarily joining the first tab member 2 and the second tab member 3 to the to-be-joined metal member 1 by welding, and the to-be-joined metal to install the to-be-joined metal member 1 to the friction stir device. The member mounting process is provided.

(8-1) Tap Repositioning Process

In the tab material arrangement step, as illustrated in FIG. 12A, the first tab material 2 is disposed along the longitudinal direction of the surface-side plasticized region W1 of the metal member 1 to be joined, and the rear surface thereof. It is a process of arrange | positioning the 2nd tab material 3 along the longitudinal direction of the side plasticization area | region W2. The surface and the back surface of the 1st tab material 2 and the 2nd tab material 3 are formed so that it may become the surface of the same height as 1st side surface C and 2nd side surface D. As shown in FIG.

(8-1) The tab material arrangement step is almost the same as the tab material placement step (1-2), so detailed description thereof is omitted.

(8-2) Fusible Welding Process

As shown in Fig. 12A, the tack welding step welds the corner portion formed by the metal member 1 to be joined with the first tab member 2 to weld the metal member 1 and the first tab member ( Provisionally attach 2). Moreover, the corner part formed by the to-be-joined metal member 1 and the 2nd tab material 3 is welded, and the to-be-joined metal member 1 and the 2nd tab material 3 are temporarily joined.

(8-3) Process of installing metal member to be joined

In the to-be-joined metal member installation process, as shown to Fig.12 (a), the 1st side surface C of the to-be-joined metal member 1 faces upwards, and to the mount of the friction stirring apparatus which is not shown in figure. The to-be-joined metal member 1 is fixed.

In addition, you may arrange | position a 1st tap material 2 and a 2nd tap material 3 on a friction stirring apparatus, and perform welding welding after performing the to-be-joined metal member attachment process.

(9) First Side Side Bonding Step

The 1st side side joining process is a surface side butt | matching part J1, the back side butt | matching part J2 with the 1st metal member 1a and the 2nd metal member 1b in 1st side surface C, and On the second metal side joint butt portion J3 between the first metal member 1a and the joint member U1, and the first metal side joint butt portion J4 between the second metal member 1b and the joint member U1. On the other hand, friction stir welding is performed as a method of drawing a brush.

In this embodiment, the 1st side side joining process is a surface side butt | joint joining process which friction-stirres the surface side butt | matching part J1 of the surface A side, the 2nd metal member 1b, and the joint member U1. And a second metal side butt joint joining step of friction stirring the second metal side joint butt joint J3 with), and a back side butt joint joining step of friction stir the back side butt joint J2 on the back surface B side; And back-side butt joint rejoining step of friction-stirring back-side butt joint J2 and friction-stirring first metal-side joint butt joint J4 between first metal member 1a and joint member U1. A first metal side joint butt joint joining step and a surface side butt joint rejoining step of friction-stirring the surface side butt joint J1 on the surface A side are provided.

In addition, in the 1st side side joining process, it carries out by turning right using the small rotating tool F which can cope relatively quickly.

(9-1) Surface Side Butt Joining Process

The surface side butt | bonding part joining process is a process of performing friction stirring with respect to the surface side butt | matching part J1 exposed to 1st side surface C, as shown to Fig.12 (a). In this embodiment, in the above-mentioned surface side joining process, since friction stirring is performed over the full length of the surface side butt | matching part J1 exposed to 1st side surface C, surface side plasticization area | region W1 The friction stir again.

That is, in the surface side butt part joining process which concerns on this embodiment, the contact point f2 which the surface side butt part J1 and the joint member U1 contact from the starting position S _M3 set in the 1st tab material 2. Friction stirring is performed continuously until. After pressing the small rotary tool F to the starting position S _M3 set to the 1st tab material 2, the small rotary tool F is moved to the starting point f1 of the surface side butt | joint joining process. And it moves to the contact point f2, without removing the small rotating tool F. As shown in FIG.

According to the surface side butting part joining process, even if the surface side plasticization area | region W1 is friction-stirred again, for example, when an oxide film is wound up and cavity defect generate | occur | produces in the surface side plasticization area | region W1, These defects can appropriately repair these defects.

(9-2) Second metal side joint butt joining step

The second metal side joint butt joint step is a step of performing friction stirring on the second metal side joint butt portion J3 of the second metal member 1b and the joint member U1. When the small rotary tool F is moved to the contact point f2, it transfers to a 2nd metal side joint butt | joining process as it is, without leaving. And the friction stirring is performed along the 2nd metal side joint abutting part J3, and the small rotating tool F is moved to the contact point f3 of the back side abutting part J2 and the joint member U1.

(9-3) Backside Butt Joining Process

Back surface side butt | bonding part joining process is a process of performing friction stirring with respect to the back surface side butt | matching part J2 exposed to 1st side surface C. As shown in FIG. In this embodiment, in the above-mentioned back side joining process, since friction stirring is performed over the full length of the back side side facing part J2 exposed to the 1st side surface C, back side side plasticization area | region W2 The friction stir again.

That is, the back surface abutting part adhering step includes a step of performing a second taepjae 3, the friction stir in succession to the turn-around point (R _M3) installed on from the contact point (f3) of the embodiment. That is, when the small rotary tool F is moved to the contact point f3, it will transfer to a back surface side joining part bonding process as it is, without leaving. And it passes through the end point f4 of the back side butt part joining process set to the butt | matching part j3 of the 2nd tab material 3 and the back surface B of the to-be-joined metal member 1, and to return point R _M3 . Move the small rotary tool (F).

Thereby, friction stirring can be performed more reliably with respect to the back surface facing part J2. In addition, even when winding-up of an oxide film and a cavity defect generate | occur | produce in back surface side plasticization area | region W2, these defects can be repaired suitably.

(9-4) Back Joining Process

The back surface-side butt joint rejoining step is a step of continuously performing friction stir welding from the return point R _M3 to the contact point f3. When the small rotary tool F is moved to the return point R _M3 , it transfers to the back side butt-bonding rebonding process without detaching. That is, the (9-4) back side butt | joint part rejoining process is a process in which the advancing direction of the (9-3) back side butt | joint part joining process becomes reverse.

(9-5) First metal side joint butt joining step

As shown in FIG. 12B, the first metal side joint butt joint joining step is friction against the first metal side joint butt joint J4 between the first metal member 1 a and the joint member U1. It is a process of stirring. When the small rotary tool F is moved to the contact point f3, it transfers to the 1st metal side joint butt | joining process as it is, without leaving. And the friction stirring is performed along the 1st metal side joint abutting part J4, and the small rotating tool F is moved to the contact point f2.

(9-6) Rebonding Process of Surface Side Butt

The surface-side butt joint rejoining step is a step of continuously performing friction stir welding from the contact point f2 to the start position S _M3 . When the small rotary tool F is moved to the contact point f2, it transfers to a surface side butt | bond part rebonding process as it is, without leaving. That is, the (9-6) surface-side butt joint rejoining step is a step in which the advancing direction of the (9-1) surface-side butt joint joining process is reversed. Moving the small rotary tool F to the end position E _M3 releases the small rotary tool F from the first tab member 2. In addition, the plasticization area | region formed at the 1st side side bonding process demonstrated above is called 1st side surface plasticization area | region w3.

Thus, by performing a 1st side side joining process, surface side abutment part J1 (surface side plasticization area | region W1), back side abutment part J2 (back side side plasticization area | region W2), By performing friction stir welding on the 2nd metal side joint abutting part J3 and the 1st metal side joint abutting part J4, the abutting part exposed to the 1st side surface C can be sealed. That is, the butt portion can be sealed more reliably by overlapping the first side-side plasticized region w3, the surface-side plasticized region W1 and the back-side plasticized region W2. Moreover, by carrying out friction stir according to the method of drawing a brush, the joining work can be efficiently performed.

(10) 4th preparation process

When the 1st side side joining process is complete | finished, the restraint of the to-be-joined metal member 1 is once released, and the to-be-joined metal member 1 is again fixed to a friction stirring apparatus with the 2nd side surface D side facing upwards. do.

(11) 2nd side side joining process

The 2nd side surface side joining process WHEREIN: The surface side butt | matching part J1, the back side butt | matching part J2, the 2nd metal side joint butting part J3, and the 1st metal side joint butting in a 2nd side surface D. In FIG. By performing friction stir welding to the portion J4, the butt portion exposed to the second side surface D is sealed. Since the 2nd side side joining process is substantially the same as a 1st side side joining process, detailed description is abbreviate | omitted.

According to the 2nd side side bonding process, the butt part is sealed more reliably by overlapping the plasticization area | region formed by the 2nd side side bonding process, and the surface side plasticization area | region W1 and the back side plasticization area | region W2. can do. Moreover, by carrying out friction stir according to the method of drawing a brush, the joining work can be efficiently performed.

Although the 1st side side joining process and the 2nd side side joining process were performed as mentioned above in this embodiment, it is not limited to the said process. The trajectory of the small rotary tool F may be another trajectory, or may not be a trick of drawing a brush. In addition, when the tunnel shape defect and the winding of an oxide film generate | occur | produce in the formed plasticization area | region by the 1st side side joining process and the 2nd side side joining process, it is preferable to fill this defect by welding etc.

According to 1st Embodiment described above, after friction-stirring the surface A and the back surface B of the to-be-joined metal member 1, the 1st side surface C and the 2nd side surface of the to-be-joined metal member 1 The unfired region can be reliably sealed by performing friction stirring on the second metal side joint butt portion J3 and the first metal side joint butt portion J4 exposed to (D). Thereby, the airtightness and watertightness of the to-be-joined metal member 1 can be improved.

In addition, the joint member U is inserted into the hollow portion formed to face the first metal member 1a and the second metal member 1b, and the joint member U and the metal member 1 to be joined are friction stir-bonded. By doing this, the strength of the joint can be increased. Moreover, production efficiency can be improved by performing friction stirring of the 1st side surface C and the 2nd side surface D by the method of brush drawing.

In addition, after performing friction stirring in each process, it is preferable to remove the burr etc. which were produced by these processes, and to make a surface smooth. As a result, in each tab member arrangement step, the tab member can be brought into close contact with the metal member 1 to be joined.

Second Embodiment

2nd Embodiment is the joining method which replaced the order of the process of 1st Embodiment.

The joining method which concerns on 2nd Embodiment is after performing said (8) 3rd preparation process, (9) 1st side side bonding process, (10) 4th preparation process, and (11) 2nd side side bonding process. You may perform the (3) surface side joining process, and (6) back surface side joining process.

That is, after performing friction stir welding of the 1st side surface C and the 2nd side surface D previously, you may perform friction stirring on the surface A side and the back surface B side. In this way, even if the friction stir welding is performed from the side surface by replacing the steps, the same effects as in the first embodiment can be obtained.

[Third Embodiment]

As shown in FIG. 13, 3rd Embodiment forms the to-be-joined metal member 20, abutting the end surface of the 1st metal member 20a, and the side surface of the 2nd metal member 20b, and to-be-joined. It differs from 1st Embodiment in that friction stirring is performed with respect to the butt part exposed to the metal member 20. FIG. That is, as shown in FIG. 14, concave grooves kc and kd are cut out at the end portions of the first metal member 20a and the second metal member 20b, respectively. 2 The joint member U2 is inserted into the hollow part which formed the metal member 20b, but was formed. And the butt portion of the first metal member 20a and the second metal member 20b, the butt portion of the first metal member 20a and the joint member U2, the second metal member 20b and the joint member U2. The friction stir welding is performed at the butt portion of the.

First, the to-be-joined metal member 20 which concerns on 3rd Embodiment is demonstrated.

13 and 14, the to-be-joined metal member 20 consists of the 1st metal member 20a, the 2nd metal member 20b, and the joint member U2, and the 1st metal member ( 20a) and the 2nd metal member 20b are formed so that it may become substantially perpendicular to planar view.

The first metal member 20a is a metal member that is rectangular in cross section, and the end face T1 is formed with a concave groove kc continuous from the first side face S1 to the second side face S2. have. The concave groove kc is rectangular in cross section and is formed in height p ₁ , width p ₂ and length p ₃ .

The second metal member 20b is a metal member that is rectangular in cross section, and the end face T2 is formed with a concave groove kd continuous from the third side face S3 to the fourth side face S4. have. The concave groove kd is rectangular in cross section, and is formed in the height q ₁ , the width q ₂ , and the length q ₃ .

The joint member U2 is a metal member representing a rectangular parallelepiped, and is inserted into the hollow portion formed by the concave groove kc of the first metal member 20a and the concave groove kd of the second metal member 20b. . The joint member U2 is formed with the height r ₁ , the width r ₂ , and the length r ₃ .

In the present embodiment, the first metal member 20a, the second metal member 20b, and the joint member U2 are made of an aluminum alloy. The first metal member 20a, the second metal member 20b, and the joint member U2 are made of, for example, friction-stirrable metal materials such as aluminum, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. It is preferable.

The height p ₁ of the concave groove kc of the first metal member 20a, the height q ₁ of the concave groove kd of the second metal member 20b, and the height r ₁ of the joint member U2. ) Is formed approximately equally. In addition, the length p ₃ of the concave groove kc, the length q ₃ of the concave groove kd, and the length r ₃ of the joint member U2 are formed substantially equal. In addition, the width r ₂ of the joint member U2 is formed almost equal to the sum of the width p ₂ of the concave groove kc and the width q ₂ of the concave groove kd.

That is, the joint member U2 is formed of the end surface T1 of the first metal member 20a and the second metal member 20b as shown in FIGS. 14 and 15A to 15C. By abutting the fourth side surface S4, the hollow portion formed by the concave groove kc and the concave groove kd is inserted without a gap, and at the same time, the side surface S5 of the joint member U2 and the first metal member 20a are provided. 1st side surface S1 of the same height is formed, and the side surface S6 of the joint member U2 and the 3rd side surface S3 of the 2nd metal member 20b are formed in the surface of the same height.

Here, the butt | matching part of the to-be-joined metal member 20 is demonstrated. 15A to 15C are perspective views of the joined metal member 20 viewed from three directions.

As shown in Fig. 15A, the end surface T1 (see Fig. 14) and the second metal member (1) of the first metal member 20a are formed on the surface A of the metal member 20 to be joined. The surface side butt | matching part J10 formed facing the 4th side surface S4 of 20b) is exposed. The back surface B of the metal member 20 to be joined is formed to face the end surface T1 of the first metal member 20a and the fourth side surface S4 of the second metal member 20b. The side abutment part J11 is exposed.

In addition, as shown in FIG. 15A, the first metal member 20a and the joint member U2 face each other to the first side surface S1 of the first metal member 20a in a substantially C shape. The first joint abutting part J20 to be formed is exposed. In addition, as shown in FIG. 15C, the first metal member 20a and the joint member U2 face each other to the second side surface S2 of the first metal member 20a in a substantially C shape. The second joint abutting part J21 formed is exposed.

15 (a) and 15 (c), in the first side surface S1 and the second side surface S2, the front side butting part J10 and the back side butting part ( J11) is exposed.

In addition, as shown in FIG. 15B, the end surface T2 of the second metal member 20b is formed to face the upper and lower surfaces of the second metal member 20b and the joint member U2. The third joint abutting part J22 to be exposed is exposed. In addition, the fourth joint abutting portion J23, which is formed in a substantially C shape with the second metal member 20b and the joint member U2, is exposed on the third side surface S3 of the second metal member 20b. It is.

Next, the specific joining method in 3rd Embodiment is demonstrated.

The joining method which concerns on 3rd Embodiment is (1) 1st preparatory process, (2) 1st main joining process, (3) tab material cutting process, (4) 2nd preparatory process, (5) agent 2 main bonding process, (6) tap material cutting process, (7) 3rd preparation process, (8) 3rd main bonding process, (9) tap material cutting process, (10) 4th preparation process, (11) 4th main joining process and (12) tab material cutting process are provided.

In the joining method according to the third embodiment, friction stir welding is performed on each butt portion of the metal member to be joined while arranging and cutting the tab material for each step. A tab material shall use a new thing for every process, respectively.

(1) 1st preparation process

A 1st preparation process is a process performed before a 1st main joining process, In the (1-1) 1st insertion process which inserts the joint member U2 into the 1st metal member 20a, and a 1st insertion process, (1-2) a tab material arrangement step of placing the tab member on the formed intermediate member, (1-3) a tack welding step of welding the intermediate member and the tab member, and (1-4) an intermediate member to install the intermediate member in the friction stir device. It is equipped with a member installation process.

(1-1) First Insertion Step

As shown in FIG. 16A, the first insertion step is a step of inserting one end side of the joint member U2 into the recessed groove kc of the first metal member 20a. The member formed by the first insertion process is hereinafter referred to as intermediate member 21.

(1-2) Tap Repositioning Process

As shown in FIG.16 (b), a tab material arrangement process is a process of arrange | positioning a pair of 1st tab material 2 and 2nd tab material 3 in the corner | angular recessed part of the intermediate member 21. FIG. The upper and lower surfaces of the first tab member 2 and the second tab member 3 are formed to have the same height as the upper and lower surfaces of the intermediate member 21.

(1-3) Fusible Welding Process

The tack welding process is performed with respect to the corner parts 2a and 2b of the 1st tab material 2 and the intermediate member 21, and the corner parts 3a and 3b of the 2nd tab material 3 and the intermediate member 21. We do welding. Thereby, in this joining process demonstrated later, spreading at the time of friction-stirring the butt | matching part of the tab material and the intermediate member 21 can be prevented.

(1-4) Intermediate Member Installation Process

The intermediate member attachment step is a step of fixing the intermediate member 21 to a friction stirring device (not shown). In 3rd Embodiment, as shown in FIG.16 (b), the intermediate member 21 is fixed to a friction stirring apparatus by making the 1st side surface S1 side of the intermediate member 21 into an upper surface.

(2) First main bonding step

The first main joining step is a step of performing friction stir welding to the butt portion between the first metal member 20a and the joint member U2. The first main joining step includes a first joint butt joint joining step of performing friction stir welding from the first side surface S1 of the intermediate member 21 and an intermediate member reinstallation step of reinstalling the intermediate member 21 into the friction stir device. And a second joint butt joining step of performing friction stir welding from the second side surface S2 of the intermediate member 21. In the first main joining step, a small rotary tool F that is relatively effective for small rotation is used.

(2-1) First Joint Butt Joining Process

The first joint butt joint joining step is a step of performing friction stir along the first joint butt joint J20 as shown in FIG. 16B. In 3rd Embodiment, friction stirring is performed by the method of one brush drawing from the starting position S _M1 set to the 1st tab material 2 to the end position E _M1 set to the 2nd tab material 3. After pressing the small rotating tool F to the starting position S _M1 of the 1st tab material 2, it moves to the starting point h1 of the 1st joint abutting part J20. And friction stirring is performed along the 1st joint abutting part J20. When it moves to the end point h2, the small rotating tool F is moved to the end position E _M1 set to the 2nd tab material 3 as it is, without leaving. Thereby, the 1st joint plasticization area | region w20 is formed in the 1st joint abutting part J20.

(2-2) Intermediate member reinstallation process

When the 1st joint butt | bonding part joining process is complete | finished, once the restraint of the intermediate member 21 is inverted and the front and back are reversed, the intermediate member 21 is installed in a friction stirring apparatus again.

(2-3) Second Joint Butt Joining Process

Although not shown in detail, the second joint butt joint joining step is the second joint butt portion J21 exposed on the second side surface S2 side of the first metal member 20a (see FIG. 15C). It is a process of performing friction stirring with respect to. Since the 2nd joint butt part joining process is substantially the same as a 1st joint butt part joining process, detailed description is abbreviate | omitted. Thereby, the 2nd joint plasticization area | region w21 (refer FIG. 17, FIG. 21) is formed in the 2nd joint abutting part J21.

In addition, in 3rd Embodiment, although the starting position S _M1 of friction stirring was set to the 1st tap material 2, it is not limited to this, You may set to the 2nd tap material 3. In addition, depending on the friction stirring device, the intermediate member reinstallation step may be omitted.

(3) tapping material cutting process

The tab material cutting step is a step of cutting the first tab material 2 and the second tab material 3 from the intermediate member 21 that has completed the first main bonding step.

(4) 2nd preparation process

The 2nd preparation process is a process performed before a 2nd main joining process, As shown in FIG. 17, the agent which inserts the intermediate member 21 into the 2nd metal member 20b, and forms a to-be-joined metal member 2 inserting step, a tab material arrangement step of arranging the tab member on the metal member 20 to be joined, a soluble welding step of welding the metal member 20 and the tab member to be joined, and the metal member 20 to be friction-stirred. It is equipped with the to-be-joined metal member attachment process provided in this.

(4-1) Second Insertion Step

As shown in FIG. 17, the second insertion step is a step of inserting the intermediate member 21 into the second metal member 20b. That is, the recessed groove kd of the 2nd metal member 20b and the part regarding the joint member U2 of the intermediate member 21 are fitted together, and the end surface T1 and 1st of the 1st metal member 20a are made | formed. 2 A metal part 20 to be joined is formed to face the 4th side surface S4 of the metal member 20b.

(4-2) Tap Repositioning Process

In the tab material arrangement step, as shown in FIGS. 15 and 18A, a pair of first tab members 2 and a second tab member 3 opposing the opposite side surfaces of the metal member 20 to be joined are provided. It is a process to arrange. The 1st tab material 2 is arrange | positioned so that the surface side butt | matching part J10 and the back surface side butt | matching part J11 may be covered in the 1st side surface S1 side of the 1st metal member 20a. Moreover, the 2nd tab material 3 covers the surface side butt | matching part J10 and the back surface side butt | matching part J11 in the recessed part formed with the 1st metal member 20a and the 2nd metal member 20b. Is placed.

(4-3) Fusible Welding Process

In the tack welding step, welding is performed on the first tab member 2, the metal member 20 to be joined, and the second tab member 3 and the metal member 20 to be joined. Thereby, in this joining process demonstrated later, spreading at the time of friction-stirring the butt | matching part of the tab material and the to-be-joined metal member 20 can be prevented.

(4-4) Process of installing metal member to be joined

The to-be-joined metal member attachment process is a process of fixing the to-be-joined metal member 20 to the friction stirring apparatus which is not shown in figure. In 3rd Embodiment, as shown to Fig.18 (a), it fixes to the friction stirring apparatus so that the surface A side of the to-be-joined metal member 20 may face upward.

(5) 2nd main bonding process

The second main joining step is a step of performing friction stir welding along the front side butting part J10 and back side butting part J11 from the surface A side and the rear face B side of the metal member 20 to be joined. to be. The second main joining step includes a front side butt joint joining step of performing friction stirring with respect to the front side butt joint J10, a joined metal member reinstallation step of reversing and reinstalling the joined metal member 20, and the back surface. It is equipped with the back surface side abutment part joining process which performs friction stirring with respect to the side abutment part J11. In addition, in the 2nd main joining process, the large rotating tool G is used.

(5-1) Surface Side Butt Joining Process

The surface side butt | bonding part joining process is a process of performing friction stirring with respect to the surface side butt | matching part J10, as shown to Fig.18 (a). In 3rd Embodiment, a surface side butt | joining part joining process carries out friction stir continuously from the starting position S _M2 set to the 1st tab material 2 to the end position E _M2 set to the 2nd tab material 3. Is done. That is, after pressing the large rotating tool G to the starting position S _M2 , the large rotating tool G is moved to the starting point h3 of the surface side butt | bonding joining process, and the end point h4 is not removed. When passing through and reaching the end position E _M2 , the large rotary tool G is pulled upward. Thereby, surface side plasticization area | region W10 is formed in surface side abutting part J10.

(5-2) Re-joining process of metal parts to be joined

When the surface side butt | bonding joining process is complete | finished, once the restraint of the to-be-joined metal member 20 is reversed and the front and back are reversed, the to-be-joined metal member 20 is again installed in a friction stirring apparatus.

(5-3) Back side joining part joining process

Although not shown specifically, a back surface side butt | joining part joining process is a process of performing friction stirring with respect to the back surface side butt | joining part J11 exposed to the back surface of the to-be-joined metal member 20. FIG. Since the back side butt part joining process is almost the same as the surface side butt part joining process, detailed description is abbreviate | omitted. Thereby, back surface plasticization area | region W11 (refer FIG. 18 (b)) is formed in back surface side abutment part J11.

In addition, before performing a surface side butt | joining part joining process and a back side side butt | joining part joining process, you may provide a lower hole in the 1st tab material 2 and the 2nd tab material 3 beforehand.

(6) tapping material cutting process

A tab material cutting process is a process of cutting off the 1st tab material 2 and the 2nd tab material 3 from the to-be-joined metal member 20 which completed 2nd main joining process.

18B is a cross-sectional view taken along the line VV of FIG. 18A. As shown in FIG. 18B, the depth Wa of the surface-side plasticized region W10 is the distance u from the surface A of the metal member 20 to be joined to the joint member U2. _It is formed so that it may become larger than _a ). In this way, when the surface side plasticized region W10 comes in contact with the joint member U2, the friction stir can be reliably performed over the entire length of the surface side butt portion J10 in the depth direction. Further, the surface-side butt portion J10 is formed by overlapping the first joint plasticization region w20 and the surface-side plasticization region W10 and the first joint plasticization region w20 and the back side plasticization region W11. The back side butt portion J11 and the first joint butt portion J20 can be sealed more reliably. Moreover, also in the 2nd side surface S2 side, by overlapping each plasticization area | region, the surface side abutting part J10, the back side abutting part J11, and the 2nd joint abutting part J21 are reliably sealed. have.

(7) 3rd preparation process

The 3rd preparation process is a process performed before a 3rd main joining process, The surface A and the back surface B of the to-be-joined metal member 20, and the 3rd side surface S3 of the 2nd metal member 20b. A tab member arrangement step of arranging the tab member along the surface, a tack welding step of welding the joined metal member 20 and each tab member, and a joined metal member installation step of installing the joined metal member 20 in the friction stir device. It is provided.

(7-1) Tap Repositioning Process

In the tab material arrangement step, as shown in FIG. 19, the first tab material 2 is disposed along the back surface side plasticization region W11 on the back surface B of the metal member 20 to be joined. Moreover, the 2nd tab material 3 is arrange | positioned along the 3rd side surface S3 of the 2nd metal member 20b. Moreover, the 3rd tab material 4 is arrange | positioned along the surface side plasticization area | region W10 in the surface A of the to-be-joined metal member 20. FIG.

(7-2) Fusible Welding Process

The tack welding process includes the first tab member 2 and the metal member 20 to be joined, the second tab member 3 and the metal member 20 to be joined, the third tab member 4 and the metal member 20 to be joined. It is a process of welding each. Thereby, in this joining process demonstrated later, spreading at the time of friction-stirring the butt | matching part of the tab material and the to-be-joined metal member 20 can be prevented.

(7-3) Process of installing metal member to be joined

The to-be-joined metal member attachment process is a process of fixing the to-be-joined metal member 20 to the friction stirring apparatus which is not shown in figure. In 3rd Embodiment, as shown in FIG. 19, the end surface T2 of the 2nd metal member 20b is made to face upward, and is fixed to a friction stirring apparatus.

(8) Third main bonding step

The third main joining step is a step of performing friction stir welding from the end face T2 side of the second metal member 20b. The 3rd main joining process is a back side joining part joining process of friction-stirring the back side joining part J11 formed in the end surface T2, and the 3rd joint of the joint member U2 and the 2nd metal member 20b. And a third joint butt joint joining step of friction stirring the butt joint J22 and a surface side butt joint joining step of friction stir the surface side butt joint J10 formed on the end face T2. That is, the friction of the brush drawing from the starting position S _M3 set on the first tab member 2 to the end position E _M3 set on the third tab member 4 via the second tab member 3 is performed. Stirring is performed. In a 3rd main joining process, the small rotating tool F is used.

(8-1) Backside Butt Joining Process

The back surface side butt | joint part joining process is a process of performing friction stirring with respect to the butt part exposed to the 1st side surface S1. In the present embodiment, (5) In the second main bonding step, all of the back surface facing portions J11 exposed to the first side surface S1 are frictionally agitated, so that the back surface plasticization region W11 is again replaced. Friction stir.

That is, as shown in FIG. 19, it continuously frictions from the starting position S _M3 set to the 1st tab material 2 to the contact point h5 which the joint member U2 and the back side facing part J11 contact. Stirring is performed.

(8-2) Third Joint Butt Joining Process

The third butt joint joining step is a step of continuously performing friction stirring from the contact point h5 to the contact point h8 where the joint member U2 and the surface side butt joint J10 contact each other. That is, when the small rotating tool F reaches the contact point h5, friction stirring is performed along the third joint abutting part J22a without detaching, and up to the change point h6 set in the second tab member 3. Move it. And it moves on the 2nd tab material 3 to the change point h7 which is a point on the extension line of the contact surface of the upper surface of the joint member U2, and the 2nd metal member 20b. And friction stirring is performed to the contact point h8 along the 3rd joint abutting part J22b, without removing the small rotating tool F. As shown in FIG.

(8-3) Surface Side Butt Joining Process

The surface side butt | bond part joining process is a process of performing friction stirring with respect to the butt part exposed to 1st side surface S1. In the present embodiment, (5) In the second main bonding step, all of the surface side butting portions J10 exposed to the first side surface S1 are frictionally agitated, so that the surface side plasticization region W10 is again replaced. Friction stir. That is, friction stirring is performed continuously from the contact point h8 to the end position E _M3 set in the 3rd tab material 4.

(9) tapping material cutting process

The tab material cutting step is a step of cutting the first tab material 2, the second tab material 3, and the third tab material 4 from the to-be-joined metal member 20 that has finished the third main bonding step.

In this way, by performing the third main bonding step, the third joint plasticization region w22 is formed in the end surface T2. Since the 3rd joint plasticization area | region w22 overlaps with the front-side plasticization area | region W10 and the back side plasticization area | region W11, the butt part exposed to the side surface can be sealed more reliably. In addition, when there are tunnel-shaped cavity defects, winding of an oxide film, etc., which are continuous to the surface-side plasticization region W10 and the back-side plasticization region W11, it can be repaired by filling the voids in the third main bonding step. have.

(10) 4th preparation process

As shown in FIG. 20, a 4th preparatory process is a process performed before a 4th main joining process, The tab material arrangement process of arrange | positioning a tab material in the end surface T2 of the 2nd metal member 20b, and The provisional welding process of welding the 2 metal member 20b and a tab material, and the to-be-joined metal member installation process of installing the to-be-joined metal member 20 to a friction stirring apparatus not shown are provided.

(10-1) Tap Repositioning Process

The tab member arrangement step is a step of arranging the first tab member 2 along the end face T2 of the second metal member 20b.

(10-2) Fusible Welding Process

The temporary welding process is a process of performing welding with respect to the corner | angular part 2a, 2b which entered the 1st tab material 2 and the 2nd metal member 20b. Thereby, in this joining process demonstrated later, spreading at the time of friction-stirring the butt | matching part of the 1st tab material 2 and the 2nd metal member 20b can be prevented.

(10-3) Process of installing metal member to be joined

The to-be-joined metal member attachment process is a process of fixing the to-be-joined metal member 20 to the friction stirring apparatus which is not shown in figure. In 3rd Embodiment, as shown in FIG. 20, the 3rd side surface S3 of the 2nd metal member 20b is made to face upward, and is fixed to a friction stirring apparatus.

(11) Fourth main bonding step

The fourth main bonding step is a step of performing friction stir welding from the third side surface S3 side of the second metal member 20b. The fourth main joining step includes a fourth joint butt joining step of frictionally stirring the fourth joint butt portion J23 of the joint member U2 and the second metal member 20b.

(11-1) 4th Joint Butt Joining Process

As shown in FIG. 20, a 4th joint butt | joining part joining process is a process of performing friction stirring continuously from the starting point h9 to the end point h10 of a 4th joint butt | joining part joining process. That is, in this embodiment, the small rotating tool F is moved from the starting position S _M4 provided in the 1st tab material 2 by the method of brush drawing, and it frictions along the 4th joint abutting part J23. Stir. Subsequently, friction stir is performed continuously to the end position E _M4 set on the extension line of the fourth joint butt portion J23.

(12) Tap material ablation process

The tab material cutting step is a step of cutting the first tab material 2 from the second metal member 20b that has finished the fourth main joining step.

In this manner, according to the fourth main bonding step, as illustrated in FIG. 20, friction stir is performed over the entire length of the fourth joint butt portion J23, and the fourth joint plasticization region w23 is formed. Therefore, as shown in FIG. 13, since the 4th joint plasticization area | region w23 and the 3rd joint plasticization area | region w22 formed in the 3rd main joining process can overlap, a butt part can be sealed more reliably. Can be.

According to the third embodiment described above, even when the first metal member 20a and the second metal member 20b are brought into a right angle, the butt portion exposed to the side surfaces and end surfaces of the metal member 20 to be joined. Since the friction stir welding can be performed efficiently and reliably, the quality of the product can be further improved. In addition, by overlapping the plasticized regions formed in each joining step, the butt portion can be sealed more reliably.

21 is the perspective view which looked at the to-be-joined metal member 20 from the 2nd side surface S2 side. In the third embodiment, friction stirring is not performed on the indented corner portion R1 formed in the first metal member 20a and the second metal member 20b. Therefore, you may weld to the indented corner | angular part R1.

For example, even if there exists a cavity defect, the winding of an oxide film, etc. in the surface side plasticization area | region W10 and the back surface plasticization area | region W11, it is applicable by carrying out paste welding, such as TIG welding and MIG welding, for example. The defect can be sealed with a weld metal.

Here, in 3rd Embodiment, after performing the 1st-4th joining process, it is preferable to remove the burr etc. which were produced by these processes, and to make a surface smooth. As a result, in each tab member arrangement step, the tab member can be brought into close contact with the metal member 20 to be joined.

In addition, in this embodiment, although friction stirring was performed in said order, it is not limited to this. For example, after the first main bonding step, the third main bonding step or the fourth main bonding step may be performed.

[4th Embodiment]

4th Embodiment is the joining method which changed the process order of 3rd Embodiment. That is, the bonding is performed in the order of the fourth bone bonding step, the third bone bonding step, the second bone bonding step, and the first bone bonding step in the third embodiment.

Specifically, the joining method according to the fourth embodiment includes (1) a fourth preparatory step, (2) a fourth main joining step, (3) a tab material cutting step, (4) a third preparatory step, ( 5) 3rd main joining process, (6) tap material cutting process, (7) 2nd preparation process, (8) 2nd main joining process, (9) tap material cutting process, (10) 1st preparation A process, (11) 1st main joining process, and (12) tab material cutting process are provided.

In addition, in the joining method which concerns on 4th Embodiment, the metal member equivalent to the to-be-joined metal member 20 which concerns on 3rd Embodiment is used. In addition, description is simplified about the process substantially equivalent to other embodiment.

(1) 4th preparation process

The fourth preparation step includes a third insertion step of inserting the joint member U2 into the second metal member 20b, a tab member arrangement step of arranging the tab member in the intermediate member formed in the third insertion step, the intermediate member and the tab member. And an intermediate member installation step of installing the intermediate welding member on a friction stirring device (not shown).

(1-1) Third Insertion Step

In the third insertion step, as shown in FIGS. 22A and 22B, the joint member U2 is inserted into the concave groove kd of the second metal member 20b to insert the intermediate member 24. It is a process of forming. The joint member U2 is inserted into the concave groove kd of the second metal member 20b, and the side surface S5 of the joint member U2 and the end surface T2 of the second metal member 20b have the same height. Shall be In addition, the side surface S6 of the joint member U2 and the 3rd side surface S3 of the 2nd metal member 20b are made into the surface of the same height.

(1-2) Tap material arrangement process, (1-3) Temperable welding process, (1-4) Intermediate member installation process

Since the tab material arrangement step, the tack welding step, and the intermediate member installation step are almost the same as in the fourth preparation step according to the third embodiment, description thereof is omitted.

(2) Fourth main bonding step

As shown in FIG.22 (b), 4th this joining process is a process of performing friction stirring with respect to the 4th joint abutting part J23 from the 3rd side surface S3 side of the intermediate member 24. FIG. Since this process is substantially equivalent to the 4th main joining process which concerns on 3rd Embodiment, description is abbreviate | omitted. By the friction stirring, the fourth joint plasticized region w23 is formed in the third side surface S3 of the second metal member 20b. After the fourth main bonding step, the tab member is removed.

(4) 3rd preparation process

In the third preparation step, as shown in FIGS. 23A and 23B, the joint member U2 of the intermediate member 24 is formed in the concave groove kc of the first metal member 20a. A fourth insertion step of inserting to form the metal member 20 to be joined, a tab material placement step of arranging a tab member in the metal member 20 to be joined, and a tack welding step of welding the metal member 20 and the tab member to be joined. And the to-be-joined metal member attachment process of installing the to-be-joined metal member 20 to the friction stirring apparatus which is not shown in figure.

(4-1) Fourth Insertion Step

The 4th insertion process is a process of inserting the joint member U2 which concerns on the intermediate member 24 to the 1st metal member 20a. That is, the joint member U2 is inserted into the concave groove kc of the first metal member 20a, and the end face T1 of the first metal member 20a and the fourth of the second metal member 20b are inserted. Back to the side (S4).

(4-2) Tap material arrangement process, (4-3) Weld welding process, (4-4) Metal member installation process to be joined

Since the tab material arrangement step, the tack welding step, and the metal member attaching step to be joined are almost the same as in the third preparation step according to the third embodiment, description thereof is omitted.

(5) Third main bonding step

As shown in FIG. 23B, the third main bonding step includes the third tab member 4 from the starting position S _M3 set in the first tab member 2 via the second tab member 3. Friction agitation is performed by the method of drawing a brush up to the end position E _M3 set at. By the said friction stirring, the 3rd joint plasticization area | region w22 is formed in the end surface T2. Since the third joint plasticization region w22 overlaps the fourth joint plasticization region w23, the butt portion exposed to the side surface of the metal member 20 to be joined can be reliably sealed.

In addition, since this process is substantially equivalent to the 3rd main bonding process of 3rd Embodiment, detailed description is abbreviate | omitted. In addition, after completion of the third main bonding step, the tab member is removed.

(7) 2nd preparation process

The 2nd preparation process is a process performed before a 2nd main joining process, The tab material arrangement process which arrange | positions a tab material to the to-be-joined metal member 20, and the soluble welding process which welds the to-be-joined metal member 20 and a tab material are carried out. And the to-be-joined metal member attachment process which installs the to-be-joined metal member 20 to a friction stirring apparatus.

Since the 2nd preparation process is substantially the same as the 2nd preparation process of 3rd Embodiment, description is abbreviate | omitted.

(8) 2nd main bonding process

As shown in FIGS. 24A and 24B, the second main bonding step includes the surface-side butt portion J10 from the surface A side and the rear surface B side of the metal member 20 to be joined. And friction stir welding along the rear surface facing portion J11. The second main joining step includes a front side butt joint joining step of performing friction stirring with respect to the front side butt joint J10, a joined metal member reinstallation step of reversing and reinstalling the joined metal member 20, and the back surface. It is equipped with the back surface side abutment part joining process which performs friction stirring with respect to the side abutment part J11. In a 2nd main joining process, the large rotating tool G is used.

In (8-1) the surface-side butt joint joining step, (8-2) the joined metal member reinstallation step, and (8-3) the back-side butt joint joining step, the second main bonding step of the third embodiment is almost the same. Since it is equivalent, the description is omitted. (B) is sectional drawing along the VI-VI line | wire of (a) of FIG. As shown in Fig. 24B, according to the second main bonding step, the third joint plasticization region w22 and the surface side plasticization region W10 and the back side plasticization formed in the third main bonding process are shown. Since the region W11 can be overlapped, the butt portion exposed to the side surface of the metal member 20 to be joined can be reliably sealed. In addition, since the surface side plasticization area | region W10 and the back side plasticization area | region W11 are in contact with the joint member U2, the surface side butting part J10 and the back side butting part J11 are more reliably. It can be sealed. Moreover, a tab material is excised after a 2nd main bonding process.

(10) First preparation step

A 1st preparation process is a process performed before a 1st main joining process, The tab material arrangement process which arrange | positions a tab material to the to-be-joined metal member 20, and the soluble welding process which welds the to-be-joined metal member 20 and a tab material are carried out. And the to-be-joined metal member attachment process which installs the to-be-joined metal member 20 to a friction stirring apparatus. In each process of a 1st preparation process, since it is substantially equivalent to the 1st preparation process of said 3rd embodiment, description is abbreviate | omitted.

(11) First bone bonding step

As shown in FIG. 25, the first main joining step is a step of performing friction stir welding to the butt portion between the first metal member 20a and the joint member U2. The 1st main joining process reinstalls the 1st joint butt part joining process which performs friction stir welding from the 1st side surface S1 side of the 1st metal member 20a, and the to-be-joined metal member 20 to a friction stirring apparatus. And a second joint butt joint joining step for performing friction stir welding from the second side surface S2 of the first metal member 20a. In the 1st main joining process, the small rotating tool F which can cope relatively quickly is used.

(11-1) First Joint Butt Joining Process

As shown in FIG. 25A, the first joint butt joint joining step includes the first joint butt portion (from the start position S _M1 set in the first tab member 2 to the end position E _M1 ). According to the method of drawing a brush along J20), friction stirring is performed continuously. The first joint plasticized region w20 formed in the first main joining step is subjected to friction stir of the first joint butt portion J20, and to the front side plasticized region W10 and the back side plasticized region W11. Since it can overlap, the surface side facing part J10 and the back side facing part J11 can be sealed more reliably.

(11-2) Re-joining Process of Metal to Be Bonded

When the 1st joint butt | bonding part joining process is complete | finished, the front and back of the to-be-joined metal member 20 are reversed and it is installed in a friction stirring apparatus again.

(11-3) Second Joint Butt Joining Process

As shown in FIGS. 25B and 25C, the second joint butt joining step is performed by welding to the corner portion R2 of the first metal member 20a and the second metal member 20b. At the same time, the first metal member 20a and the second joint butt portion J21 of the joint member U2 are subjected to friction stir.

That is, welding, such as TIG welding or MIG welding, is performed with respect to the surface side plasticization area | region W10 and the back surface plasticization area | region W11 which entered into the corner | angular part R2 which entered. Thereby, defects, such as a cavity defect exposed to the surface side plasticization area | region W10 and the back surface plasticization area | region W11, and winding up of an oxide film, can be sealed by a weld metal. Moreover, what is necessary is just to perform welding to the entered corner part suitably.

As shown in (c) of FIG. 25, in the 2nd joint abutting part J21, the end position (A) along the 2nd joint abutting part J21 from the starting position S _M1 set to the 1st tap material 2 Friction stirring is performed by the method of drawing a brush up to E _M1 ). Moreover, it is preferable that the 2nd joint plasticization area | region w21 formed by the 2nd joint butt | joining part joining process overlaps with the weld metal formed in the corner | angular part R2 which entered. Thereby, the recessed corner part R2 and the 2nd joint abutting part J21 of the to-be-joined metal member 20 can be sealed reliably.

As described above, in the fourth embodiment, even if friction stirring is performed in the order of the fourth, third, second, and first main bonding steps, the same effect as in the above-described third embodiment can be obtained.

In addition, in 4th Embodiment, although friction stir welding was performed in said order, it is not limited to this. For example, after a 3rd insertion process, you may carry out in a 3rd main joining process and a 4th main joining process.

[Fifth Embodiment]

The joining method which concerns on 5th Embodiment is the 3rd metal member 20c and the joint member which show the shape substantially the same as the 1st metal member 20a, the 2nd metal member 20b, and the 1st metal member 20a. U3) is bonded and bonded in a T-shape in plan view.

That is, as shown to FIG. 27, the to-be-joined metal member 30 which concerns on 5th Embodiment uses the joint member U3 larger in width than the joint member U2 used in 4th Embodiment. The to-be-joined metal member 30 inserts the 1st metal member 20a and the 3rd metal member 20c in the both ends of the joint member U3, and simultaneously attaches the 2nd metal member 20b to the 1st metal member 20a. ) And the third metal member 20c.

5th Embodiment is (1) 1st preparatory process, (2) 5th main bonding process, (3) tab material cutting process, (4) 2nd preparation process, and (5) 6th main bonding process And (6) tap material removal step, (7) third preparation step, and (8) seventh main bonding step.

In addition, the thing of the process substantially equivalent to other embodiment simplifies description.

(1) 1st preparation process

The 1st preparation process is a process performed before a 5th main joining process, The 5th insertion process which inserts each member and forms an intermediate member, The tab material arrangement process which arrange | positions a tab material to an intermediate member, An intermediate member and a tab material And an intermediate member installation step of installing the fusible welding step of welding the intermediate member to a friction stirring device (not shown).

(1-1) Fifth Insertion Step

As shown in FIG. 28, the fifth insertion step is a step of forming the intermediate member 34 by fitting the first metal member 20a, the third metal member 20c, and the joint member U3. The intermediate member 34 inserts the first metal member 20a and the third metal member 20c at both ends of the joint member U3, and at the same time, the first side surface S1 of the first metal member 20a. And the 5th side surface S7 regarding the 3rd metal member 20c, and the side surface S5 of the joint member U2 are formed in the surface of the same height.

(1-2) Tap Repositioning Process

In the tab member arrangement step, as shown in FIG. 28, the pair of first tab members 2 and the second tab member 3 are disposed at the corners of the first metal member 20a and the joint member U2. At the same time, a pair of the third tab member 4 and the fourth tab member 5 are disposed at the corners of the third metal member 20c and the joint member U3.

(1-3) Temperable Welding Process, (1-4) Intermediate Member Installation Process

The temporary welding process is a process of welding the intermediate | middle member 34 and the 1st tab material 2-the 4th tab material 5. And the intermediate member 34 which bonded the 1st tab material 2 to the 4th tab material 5 was made to the friction stirring apparatus which is not shown so that the 1st side surface S1 of the 1st metal member 20a may face upward. Install.

(2) Fifth bone bonding step

The fifth main joining step includes a first joint butt joint joining step of performing friction stirring on the first joint butt joint J20, and a fifth joint butt joint joining step of performing friction stir to the fifth joint butt joint J24. It is provided.

(2-1) First Joint Butt Joining Process

The 1st joint butt | joining part joining process of the 2nd tab material 3 and the 1st metal member 20a is carried out from the starting point m1 set in the corner | angular part of the 1st tab material 2 and the 1st metal member 20a. It is a process of performing friction stirring to the end point m2 set in the corner which entered. In this embodiment, friction stirring is performed by the method of brush drawing from the starting position S _M5 set to the 1st tab material 2 to the end position E _M5 along the 1st joint abutting part J20.

(2-2) Fifth Joint Butt Joining Process

In the fifth joint butt joint joining step, the fourth tab member 5 and the third metal member 20c are formed from the starting point m3 set in the corner of the third tab member 4 and the third metal member 20c. It is a process of performing friction stirring to the end point m4 set in the corner which entered. In this embodiment, friction stirring is performed by the method of brush drawing from the starting position S _M5 set to the 3rd tab material 4 to the end position E _M5 along the 5th joint abutting part J24. When the fifth main bonding step is completed, the first tab member 2 to the fourth tab member 5 are removed from the intermediate member 34. The fifth joint plasticization region w24 is formed in the fifth joint abutting portion J24.

(4) 2nd preparation process

The 2nd preparation process is a process performed before a 6th main joining process, The 6th insertion process which inserts each member and forms the to-be-joined metal member 30, and arrange | positions a tab material to the to-be-joined metal member 30. FIG. And a tack welding process for welding the joined metal member 30 and the tab member, and the joined metal member attaching step of installing the joined metal member 30 in a friction stirring device (not shown). .

(4-1) 6th insertion process, (4-2) tap material arrangement process

As shown in FIG. 27 and FIG. 29, the sixth insertion step is a step of inserting the intermediate member 34 into the second metal member 20b to form the metal member 30 to be joined. Then, the first tab member 2 to the fourth tab member 5 are disposed on the metal member 30 to be joined.

On the surface A side, the 1st tab material 2 is arrange | positioned along the 2nd surface side abutting part J42 which is a butt | matching part of the 3rd metal member 20c and the 2nd metal member 20b. On the surface A side, the 2nd tab material 3 is arrange | positioned along the 1st surface side abutting part J40 which is a butt | matching part of the 1st metal member 20a and the 2nd metal member 20b. The 3rd tab material 4 is arrange | positioned along the 2nd back surface side abutment part J43 which is a butt | matching part of the 2nd metal member 20b and the 3rd metal member 20c in the back surface B side. The 4th tab material 5 is arrange | positioned along the 1st back surface side abutment part J41 which is a butt | matching part of the 1st metal member 20a and the 2nd metal member 20b in the back surface B side.

(4-3) Temperable welding step, (4-4) Metal joined part installation step

The soluble welding step is a step of welding the first tab material 2 to the fourth tab material 5 and the metal member 30 to be joined. And the to-be-joined metal member 30 which welded the tab material is installed in a friction stirring apparatus so that the 1st side surface S1 of the 1st metal member 20a may face upward.

(5) 6th main bonding process

The 6th present joining process is provided with the surface side joining route which friction stirs the butt | matching part of the surface A side of the to-be-joined metal member 30, and the back side joining route which friction stirs the butt part of the back surface B side. will be.

The surface-side joining route is subjected to friction stir at the second surface-side butt joint (5-1) step of performing friction stir at the second surface-side butt joint J42, and (5) to friction stir at the third joint butt joint J22 (5). -2) 3rd joint abutting part joining process, and (5-3) 1st surface side abutting part joining process which performs friction stirring on the 1st surface side abutting part J40.

That is, the surface side joining route is continuous by the method of brush drawing in which the 2nd surface side butt joint joining process, the 3rd joint butt joint joining process, and the 1st surface side butt joint joining process are carried out from the starting point m5 to the end point m6. By friction stirring. In this embodiment, friction stirring is performed without leaving the small rotating tool F from the start position S _M6 set to the 1st tab material 2 to the end position E _M6 set to the 2nd tab material 3. Do it.

On the other hand, the back side joining route performs friction stir at the second back side butt-joining step (5-4) which performs friction agitation on the second back side butt-joint part J43, and performs friction stir at the third joint abutment part J22 ( 5-5) The 3rd butt | matching part joining process and the (5-6) 1st back side butt part joining process which perform friction stirring on the 1st back surface side butt | matching part J41 are provided.

That is, the back side joining route is a method of brush drawing in which the second back side butt joint joining process, the third joint butt joint joining process and the first back side butt joint joining process are performed from the starting point m7 to the end point m8. It is a process of performing friction stirring continuously. In this embodiment, friction stirring is performed without leaving the small rotating tool F from the starting position S _M6 set to the 3rd tab material 4 to the end position E _M6 set to the 4th tap material 5. Do it.

When the 6th main joining process is complete | finished, the 1st tab material 2-the 4th tab material 5 are cut out from the to-be-joined metal member 30. FIG.

(7) 3rd preparation process

The 3rd preparation process is a process performed before 7th this joining process, The tab material arrangement process which arrange | positions a tab material to the to-be-joined metal member 30, and the tack welding process which welds the tab material and a to-be-joined metal member 30 are carried out. And the to-be-joined metal member attachment process of installing the to-be-joined metal member 30 to the friction stirring apparatus which is not shown in figure.

(7-1) Tap Repositioning Process

As shown in FIG. 30, the tab member arrangement step is a step of arranging the first tab member 2 to the fourth tab member 5 on the metal member 30 to be joined. The 1st tab material 2 is arrange | positioned along the 1st surface side abutting part J40 in the 1st side surface S1 side of the 1st metal member 20a. The second tab member 3 is disposed at a corner of the first metal member 20a and the second metal member 20b. The third tab member 4 is disposed along the second surface side butt portion J42 on the fifth side surface S7 side of the third metal member 20c. The fourth tab member 5 is disposed at the corner of the second metal member 20b and the third metal member 20c.

(7-2) Weld welding process, (7-3) Metal joined part installation process

The soluble welding step is a step of welding the first tab material 2 to the fourth tab material 5 and the metal member 30 to be joined. And the to-be-joined metal member 30 which welded the tab material is installed in a friction stirring apparatus so that the surface A side may face upward.

(8) 7th main bonding process

The seventh present joining step includes a first surface-side butt joint joining step of frictionally stirring the first surface-side butt joint J40 on the surface side of the metal member 30 to be joined, and the metal member 30 to be joined. On the surface side of the second surface-side butt joint joining step of friction stir- ing the second surface-side butt joint J42, and on the rear face side of the metal member 30 to be joined, the first rear-side butt joint J41 1st back side butt part joining process of friction-stirring) and 2nd back side butt part joining process of friction-stirring 2nd back surface side abutment part J43 in the back surface side of the to-be-joined metal member 30, It is provided. In the seventh present bonding step, the large rotary tool G is used.

(8-1) First surface-side butt joint joining step, (8-2) Second surface-side butt joint joining step

The first surface-side butt joint joining step is the first surface-side butt portion J40 from the starting position S _M7 set in the first tab member 2 to the end position E _M7 set in the second tab member 3. Friction agitation). The second surface side butt joint joining step is friction along the second surface side butt joint J42 from the starting position S _M7 set in the third tab member 4 to E _M7 set in the fourth tab member 5. Stirring is performed.

In addition, as shown in FIG. 26, also in the back surface B side of the to-be-joined metal member 30, the 1st back surface side is substantially the same as a 1st surface side butt part joining process and a 2nd surface side butt part joining process. The butt joint joining step and the second back surface side butt joint joining step are performed.

FIG. 26B is a sectional view taken along line VII-VII of FIG. 26A. As illustrated in FIG. 26B, welding may be performed to the corner portions R3 and R4 of the metal member 30 to be joined. For example, the first surface side plasticized region W40, the second surface side plasticized region W42, and the first corner portion R3 and R4 are welded by MIG welding or TIG welding. Even when winding-up of an oxide film and a cavity defect generate | occur | produce in the 1st back surface side plasticization area | region W41 and the 2nd back surface side plasticization area | region W43, these defects can be sealed by a weld metal.

According to the fifth embodiment described above, the first metal member 20a, the second metal member 20b, the third metal member 20c, and the joint member U3 are fitted to form a T-shape in plan view. Even in this case, similarly to the joining method according to the first embodiment, the abutting portions exposed to the surface A and the back surface B side are stir-fried, and the abutting portions exposed to the side surfaces of the to-be-joined metal member 30 are efficiently The friction can be stirred. In addition, as shown in FIG. 26A, the butt portion can be sealed more reliably by overlapping the plasticized regions formed by the respective steps. That is, for example, abutting part can be sealed more reliably by overlapping the 1st surface side plasticization area | region W40, the 3rd joint plasticization area | region w22, and the 1st joint plasticization area | region w20. .

[Sixth Embodiment]

Next, a sixth embodiment of the present invention will be described.

31 is an overall perspective view illustrating a bonding method according to a sixth embodiment. As shown in FIG. 31, the joining method which concerns on 6th Embodiment is the 1st metal member 710a, the 2nd metal member 710b, the 1st metal member 710a, and the 2nd metal member 710b. Abutment exposed to each of the surface A, back surface B, first side C and second side D of the to-be-joined metal member 70 having a joint member 720 interposed therebetween. The friction stir welding is performed on the portion. Hereinafter, each process is explained in full detail.

The joining method which concerns on this embodiment is (1) abutment process, (2) 1st step part provisional joining process, (3) 1st step part main joining process, (4) joint member arrangement | positioning process, (5) surface provision A bonding process, (6) surface bone bonding process, (7) 2nd step part bone bonding process, and (8) side bone bonding process are included.

First, as shown in FIG. 32, interposition is provided between two metal members, the 1st metal member 710a and the 2nd metal member 710b, the 1st metal member 710a, and the 2nd metal member 710b. The joint member 720 to be described will be described.

The first metal member 710a, the second metal member 710b, and the joint member 720 are made of a metal that can be friction-stirred such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy, and the like. . The 1st metal member 710a, the 2nd metal member 710b, and the joint member 720 are formed with the metal material of the same composition in this embodiment.

The first metal member 710a and the second metal member 710b are members having substantially the same shape, and have a main body portion Q which is a thick portion and a stepped portion R formed thinly at an end of the main body portion Q. It is equipped with. In the following description, the side surface 711 which stands up from the surface 716 of the step part R among the side surfaces 711 and 714 of the main-body part Q is called the "standing side 711." The side surface 714 is called "exposed side surface 714". In addition, of the side surfaces 715 and 718 of the stepped portion R (refer to FIG. 32 (d)), the side face 715 facing the other stepped portion R is referred to as the “butting side 715”. The outer side surface 718 is called the "exposure side surface 718". In the present embodiment, the standing side surface 711 of the main body portion Q rises vertically from the surface 716 of the stepped portion R (see FIG. 32 (c)). It is parallel to the butting side 715 (see FIG. 32 (b)).

The stepped portion R is a portion having a smaller thickness than the body portion Q, and is formed by roughing or cutting the surface 712 of the body portion Q. As shown in FIG. 32C, the surface 716 of the stepped portion R is located at a lower position from the surface 712 of the main body Q, but the rear surface 717 of the stepped portion R is shown. Is the surface of the same height as the back surface 713 of the main body Q. As shown in FIG. The side face 715 of the stepped portion R is perpendicular to the surface 716 of the stepped portion R. As shown in FIG. The depth dimension of the stepped portion R (distance from the standing side surface 711 of the main body portion Q to the butted side surface 715 of the stepped portion R) is a large rotary tool G (described later). 5 (b)] is larger than the radius (= Y _1/2 ) of the shoulder portion G1. Although there is no restriction | limiting in particular in the magnitude | size of the step part R thickness t _B , In this embodiment, it is set to 2/3 of the thickness t _A of main-body part Q.

In addition, the first metal member 710a and the second metal member 710b are also referred to simply as the metal member 710.

(1) butt process

In the butt step, as shown in FIG. 32, the stepped portions R and R of the first metal member 710a and the second metal member 710b are brought into contact with each other, and the recessed portion is provided between the main body portions Q and Q. It is a process of forming 700. In the butt step, the butt side 715 of the stepped portion R of the second metal member 710b is brought into close contact with the butt side 715 of the stepped portion R of the first metal member 710a, and the first The surface (upper surface) 716 of the stepped portion R of the metal member 710a and the surface (upper surface) 716 of the stepped portion R of the second metal member 710b are set to the same height surface. The rear surface 717 of the stepped portion R of the first metal member 710a and the rear surface 717 of the stepped portion R of the second metal member 710b are the surfaces of the same height. The butt | matching part J720 is formed by mutually joining the step | step part R of the 1st metal member 710a and the 2nd metal member 710b.

In addition, when the stepped portions R and R are brought into contact with each other, the standing side 711 of one main body Q and the standing side 711 of the other main body Q will be described later. ) Are opposed at a larger interval than the outer diameter Y ₁ of the shoulder portion G1 of FIG.

(2) 1st step provisional bonding process

In the first stepped part joining step, as shown in FIG. 33, the stepped part J710 of the stepped part R and one tab member 730, the stepped part J720 between the stepped parts R and R, and The stepped portion J730 of the stepped portion R and the other tab member 740 is temporarily joined from the surface side.

The tab members 730 and 740 are arranged so as to sandwich the abutting portion J720 therebetween, and as shown in FIGS. 32A and 32B, exposed side surfaces 718 of the stepped portions R and R, respectively. , 718) is provided with a dimension and shape to cover and cover. The tab members 730 and 740 according to the present embodiment abut not only the exposed side surfaces 718 and 718 of the stepped portions R and R, but also the exposed side surfaces 714 and 714 of the main body portions Q and Q. The tab members 730 and 740 each have the same thickness dimension as the thickness dimension of the stepped portion R (see FIG. 32 (d)), so that the surface 716 and the back surface 717 of the stepped portion R are formed. It is arrange | positioned so that it may become the surface of the same height as, and it joins to the exposed side surface 714, 714 of main-body parts Q and Q by welding in this state. Although there is no restriction | limiting in particular in the material of the tab materials 730 and 740, In this embodiment, it is formed with the metal material of the same composition as the metal member 710. FIG.

Here, the length L ₁ (see FIG. 5) of the stirring pin G2 of the large rotary tool G used in the present embodiment is the thickness t _B of the stepped portion R (FIG. 2C). It is preferable to set so as to be 1/2 or more and 3/4 or less, and more preferably, so as to satisfy a relationship of 1.01 ≦ 2L ₁ / t _B ≦ 1.10.

In the first step provisional joining step, as shown in FIG. 33, one small rotary tool F is moved to form a movement trajectory (bead) of one brush drawing, and is joined to the abutting parts J710, J720, and J730. The friction stir is continuously performed from the surface 716 side. That is, the stirring pin F2 (refer FIG. 5 (a)) of the small rotary tool F inserted in the starting position S _P of friction stirring is moved to the end position E _P without deviating in the middle. .

In addition, although the 1st step part temporary joining process became the trajectory as shown in FIG. 33 in 1st Embodiment, it is not limited to this and may be another trajectory.

(3) First step main bonding step

1st step part In this joining process, friction stirring is performed from the surface 716 side of the step part R with respect to the butt | matching part J720 of the temporary welding state using the large rotating tool G. As shown in FIG. Specifically, as shown to (a) and (b) of FIG. 34, the stirring pin G2 of the large rotating tool G is inserted (press-in) in the starting position S _M1 , and the stirring pin which inserted this is inserted. (G2) is moved to the end position E _M1 without deviating in the middle.

When the large rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in turn, and at the position away from the stirring pin G2, the metal that has been plastically fluidized is cured again and the first step is made. The subplasticized region W71 is formed. In order to repair the joining defect which may be contained in this 1st step part plasticization area | region W71, you may perform friction stirring with respect to the 1st step part plasticization area | region W71 as needed.

When the above-mentioned first stepped part provisional bonding step and the first stepped part bonding step are completed, the burr generated by friction stir is removed and the surface 716 of the stepped part R (the bottom of the recessed part 700). Grind to smooth. In addition, in this embodiment, although the 1st step part provisional joining process and the 1st step part main joining process were performed from the surface 716 side of the step part R, the back surface 717 side of the step part R is shown. May be performed from.

(4) Joint member placement process

In the joint member arranging step, as shown in FIGS. 35A and 35B, the joint member 720 is inserted into the recess 700, and the joint member 720 is attached to both main body parts Q and Q. FIG. ), And a pair of tab members 71 and 72 are arrange | positioned so that the joint member 720 may be interposed, and each tab member 71 and 72 is abutting against the joint member 720. FIG.

In addition, in the following description, the side surface 721 which is symmetrical to the side surface (that is, the standing side surface 711 of the main body Q) among the side surfaces 721 and 722 of the joint member 720. ) Is referred to as "butting side 721" and the other side 722 is referred to as "exposure side 722". In addition, when distinguishing the tab members 71 and 72, the tab member 71 is called "the 1st tab member 71", and the tab member 72 is called the "2nd tab member 72".

The joint member 720 is mounted on the bottom surface of the recess 700 (that is, the surface 716 of the stepped portion R). The joint member 720 according to the present embodiment consists of a plate-shaped member having a plane shape (in this embodiment, a rectangle) substantially the same as the recessed portion 700, and when inserted into the recessed portion 700, The butt side 721 is in contact with the standing side 711 of the main body Q (see FIGS. 36A and 36B), and the exposed side 722 is the exposed side 714 of the main body Q. FIG. And the exposed side surface 718 of the stepped portion R (see FIG. 32 (a)). Although there is no restriction | limiting in particular in the magnitude | size of the thickness of the joint member 720, In this embodiment, it is set equal to the depth of the recessed part 700, and when the joint member 720 is inserted in the recessed part 700, The surface (upper surface) 723 of the member 720 and the surface (upper surface) 712 of the main body Q become a surface of the same height (see FIG. 36B). The material of the joint member 720 is not particularly limited, but is formed of a metal material having the same composition as the metal member 710 in this embodiment.

The tab members 71 and 72 cover the main body portions Q and Q appearing on the exposed side surface 722 side of the joint member 720 and the seams (boundary lines) of the joint member 720 to cover and cover them. Equipped with. The tab members 71 and 72 according to the present embodiment are not only exposed to the exposed side surfaces 722 of the joint member 720 but also to the exposed side surfaces 714 and 714 of the main body parts Q and Q.

In addition, as shown in FIG.35 (b), the tab member 71, 72 has the surface of the same height as the surface 712 of the main body part Q, and the surface 723 of the joint member 720, respectively. It is installed as possible. In addition, in this embodiment, the 1st tab member 71 is mounted on the surface (upper surface) of the tab member 730 used when joining the stepped portions R and R, and the main body portions Q and Q by welding. To the exposed side surfaces 714 and 714. Similarly, the second tab member 72 is mounted on the surface (upper surface) of the tab member 740 used when joining the step portions R and R, and the exposed side surfaces 714 of the main body portions Q and Q by welding. , 714).

In addition, the member formed by arrange | positioning the joint member 720 in the 1st metal member 710a and the 2nd metal member 710b is also called the to-be-joined metal member 70 hereafter. In addition, as shown in FIG. 31, the surface of the to-be-joined metal member 70 is surface A, the back surface B, the one side 1st side C, and the other side 2nd side ( It is called D).

(5) surface temporary bonding process

In the surface temporary joining process, friction stir is preliminarily performed from the surface A side with respect to the butt part exposed to the surface A of the to-be-joined metal member 70. As for the surface temporary joining process, as shown in FIG. 37, the butt | matching part J71 (4th intersection point c74 thru | or 4th) of the 1st tab material 71 and the joint member 720 is used using the small rotating tool F. As shown in FIG. 1 intersection c71], butt | matching part J72 (1st intersection c71 thru | or 2nd intersection c72) of the main-body part Q of the 1st metal member 710a, and the joint member 720, and 2nd Butt portion J73 (second intersection c72 to third intersection c73) of tab member 72 and joint member 720, and main body portion Q and joint member 720 of second metal member 710b. ) Is a step of performing friction stir with respect to the butt portion J74 (third intersection c73 to fourth intersection c74).

The surface of the bonding process, the start position (S _P) and end position (E _P) to a first taepjae 71 small rotary tool (F) is installed, and inserted into the starting position (S _P) of the friction stir during Relative movement is made to the end position E _P without disengaging. That is, in the joint temporary joining process, one small rotary tool F is moved so as to form a movement trajectory (bead) of one brush stroke, and friction stir is continuously performed on the butt portions J71 to J74.

First, the procedure of friction stirring in a surface temporary bonding process is demonstrated in more detail.

Place the small rotary tool F directly above the starting position _SP installed in place of the first tab member 71, and while lowering the small rotary tool F to the right, the stirring pin F2 (Fig. 5 (a) reference] is pressed to the starting position _SP . Although the rotation speed of the small rotating tool F is set according to the dimension and shape of the stirring pin F2, the material, the thickness, etc. of the to-be-joined metal member 70 to be friction-stirred, most of 500-2000 (rpm) It is set in the range.

When the stirring pin F2 is in contact with the surface of the first tab member 71, the metal around the stirring pin F2 is plasticized and fluidized by frictional heat, and the stirring pin F2 is inserted into the first tab member 71. do. The entire stirring pin F2 enters the first tab member 71, and the entire surface of the lower end surface F11 (see FIG. 5A) of the shoulder portion F1 is the surface of the first tab member 71. When it touches, it moves relative to the temporary joining starting point p71 provided in the center part (middle of 1st intersection c71 and 4th intersection c74) of the butt | matching part J71, rotating the small rotating tool F. As shown in FIG. Let's do it.

The moving speed (feeding speed) of the small rotating tool F is set according to the size and shape of the stirring pin F2, the material and the thickness of the metal member 710 or the like that is frictionally stirred, but most of them are 100 to 1000 ( Mm / min). In addition, when moving the small rotating tool F, although the axis line of the shoulder part F1 may be inclined a little to the rear side of the advancing direction with respect to a perpendicular line, if it makes it perpendicular without making it incline, the direction of the small rotating tool F will be Switching becomes easy, and complicated movement becomes possible.

When the small rotary tool F is moved relatively and friction stir is performed to the temporary joining starting point p71 continuously, the one end of the butt | matching part J71 is used as it is, without leaving the small rotary tool F from the temporary joining starting point p71. The relative movement toward the first intersection c71 is performed, and frictional stirring is performed on a part of the butt portion J71. That is, the root of friction stir is set on the joint (boundary line) of the first tab member 71 and the joint member 720, and the small rotating tool F is moved relative to the butt portion J71 by the relative movement. Friction stirring is performed.

Moreover, when the stirring pin F2 of the small rotating tool F enters the butt | matching part J71, the force which tries to isolate | separate the 1st tap material 71 and the joint member 720 acts, but the 1st tap material 71 Is welded to the main body portion Q, so that no gap occurs between the first tab member 71 and the metal member 710.

When the small rotary tool F is relatively moved to the first intersection c71, the first tab member 71 and the first metal member 710a are left as they are without leaving the small rotary tool F at the first intersection c71. Relatively moves toward the first intermediate point m71 provided in the abutting part J75 with the main body part Q of the tool, and performs friction stirring on the abutting part J75.

When the small rotary tool F is moved relatively to the first intermediate point m71, the small rotary tool F is intruded into the first tab member 71 without being detached from the first intermediate point m71, and the first intermediate member m71 is moved. While friction stirring is performed with respect to the tab material 71, it moves relatively to the 1st intersection c71 which is also an end part of the butt | matching part J72. That is, the route of friction stirring for returning the small rotary tool F from the 1st intermediate point m71 to the 1st intersection c71 is set to the 1st tab material 71. FIG. In this case, when the small rotating tool F is returned from the first intermediate point m71 to the first intersection point c71, joining defects are less likely to occur in the metal member 710 or the joint member 720, so that The conjugate of can be obtained.

When the small rotary tool F is returned to the first intersection c71, the small rotary tool F is driven into the butt portion J72 without being detached from the first intersection c71, and is brought into the butt portion J72. Relatively moves to the 2nd intersection point c72 which is the other end of the butt | matching part J72, performing friction stirring with respect to it. That is, when the small rotary tool F is returned to the first intersection point c71, the route of friction stir is set on the main body portion Q of the one metal member 710 and the seam (boundary line) of the joint member 720. By carrying out the relative movement of the small rotary tool F along the said route, friction stirring is performed with respect to the butt | matching part J72.

When the small rotary tool F is relatively moved to the second intersection c72, the small rotary tool F is intruded into the second tab member 72 without being detached from the second intersection c72, and the second tab member ( 72 is relatively moved to the second intermediate point m72 provided in the abutting portion J76 between the second tab member 72 and the main body portion Q of the first metal member 710a. That is, the route of friction stirring from the 2nd intersection point c72 to the 2nd intermediate point m72 is set to the 2nd tap material 72. As shown in FIG.

When the small rotary tool F is moved relatively to the second intermediate point m72, the second rotary point F is also a second end that is also one end of the butt portion J73 without detaching the small rotary tool F from the second intermediate point m72. The relative movement toward the intersection c72 is performed, and friction stirring is performed on the butt portion J76. That is, friction stirring is performed also about the butt | matching part J76 by relatively moving the small rotating tool F along the route of the friction stirring provided on the joint (boundary line) of the 2nd tab material 72 and the main-body part Q.

When the small rotary tool F is relatively moved to the second intersection c72, the third intersection c73, which is the other end of the butt portion J73, is left as it is without detaching the small rotary tool F from the second intersection c72. Relative movement toward the surface, and friction stirring is performed on the butt portion J73. That is, when friction stirring is continuously performed to the 2nd intersection point c72, friction provided on the joint (boundary line) of the 2nd tab material 72 and the main-body part Q, without ending friction stirring at the 2nd intersection point c72. Friction stirring is performed with respect to the butt | matching part J73 by relatively moving the small rotary tool F along the route of stirring.

When the small rotary tool F is relatively moved to the third intersection c73, the second tab member 72 and the second metal member 710b are intact without leaving the small rotary tool F at the third intersection c73. Relatively moves toward the third intermediate point m73 provided in the abutting part J77 with the main body part Q, and performs friction stirring on the abutting part J77. That is, when friction stirring is continuously performed to the 3rd intersection point c73 which is the other end part of the butt | matching part J73, the 2nd tap material 72 and the main-body part Q do not stop friction stirring at the 3rd intersection point c73. The friction stirring is also performed on the abutting part J77 by relatively moving the small rotary tool F along the route of the friction stirring provided on the seam (boundary line) of the joint.

When the small rotary tool F is moved relatively to the third intermediate point m73, the small rotary tool F is intruded into the second tab member 72 without being detached from the third intermediate point m73, and the second intermediate tool m73 is moved. While friction stirring is performed with respect to the tab material 72, it moves relative to the 3rd intersection point c73 which is also an end part of the butt | matching part J74. That is, the route of friction stirring for returning the small rotary tool F to the 3rd intersection point c73 from the 3rd intermediate point m73 is set to the 2nd tap material 72. As shown in FIG.

When the small rotary tool F is returned to the third intersection c73, the small rotary tool F is inverted into the butt portion J74 without detaching the small rotary tool F from the third intersection c73, and is brought into the butt portion J74. Relative movement is carried out to the 4th intersection point c74 which is the other end part of the butt | matching part J74, carrying out friction stirring. That is, when the small rotary tool F is returned to the third intersection point c73, the route of friction stir is set on the main body portion Q of the other metal member 710 and the joint (boundary line) of the joint member 720. Then, friction stirring is performed on the butt portion J74 by relatively moving the small rotary tool F along the route.

When the small rotary tool F is relatively moved to the fourth intersection c74, the small rotary tool F is moved to the first tab member 71 without leaving the small rotary tool F at the fourth intersection c74, and the first tab member ( Relatively moving to the fourth intermediate point m74 provided in the abutting portion J78 between the first tab member 71 and the main body portion Q of the other metal member 710 while performing friction stir with respect to 71). . That is, the route of the friction stirring from the fourth intersection c74 to the fourth intermediate point m74 is set in the first tab member 71.

When the small rotary tool F is moved relatively to the fourth intermediate point m74, the fourth rotary point F is also the other end of the butt portion J74 without being detached from the fourth intermediate point m74. The relative movement toward the intersection c74 is performed, and friction stirring is performed on the butt portion J78. That is, friction stirring is performed also about the butt | matching part J78 by relatively moving the small rotating tool F along the route of the friction stirring provided on the joint (boundary line) of the 1st tab material 71 and the main-body part Q.

When the small rotary tool F is relatively moved from the fourth intermediate point m74 to the fourth intersection c74, the butt portion J71 is directly removed without detaching the small rotary tool F from the fourth intersection c74. Relatively moves toward the temporary joining end point p72 provided in the middle, and performs friction stirring with respect to the butt | matching part J71. That is, when friction stirring is continuously performed to the 4th intersection point c74 which is the other end part of the butt | matching part J71, the 2nd tap material 72 and the main-body part Q do not stop friction stirring at the 4th intersection point c74. The friction stirring is performed with respect to the butt | matching part J71 by carrying out the relative movement of the small rotary tool F along the route of the friction stirring provided on the joint (boundary line).

When the small rotary tool F is moved relatively to the temporary joining end point p72, the small rotary tool F is plunged to the first tab member 71 without leaving the small rotary tool F at the temporary joint end point p72. Relatively move to the end position E _P of friction stirring, performing friction stirring with respect to 71).

When the small rotary tool F reaches the end position E _P , the small rotary tool F is raised while rotating, and the stirring pin F2 (see FIG. 5A) is moved from the end position E _P. Departure.

In addition, when the small rotating tool F is rotated to the right, there is a possibility that a minute joining defect may occur on the left side of the small rotating tool F in the advancing direction, so that the mating portions of the tab members 71 and 72 and the joint member 720 are rotated. When friction stirring is performed along (J71, J73) and the mating portions J75 to J78 of the tab members 71 and 72 and the main body portion Q, the tab member 71 is formed on the left side in the advancing direction of the small rotary tool F. It is preferable to set the route of friction stir so that 72 is located. That is, when the small rotary tool F is rotated to the right, the small rotary tool F reaches from the temporary joint starting point p71 to the temporary joint end point p72 so that the small rotary tool F moves to the right along the outer edge of the joint member 720. It is desirable to establish the route of frictional stirring. In this case, since joining defects are less likely to occur on the joint member 720 side, a high quality joined body can be obtained.

Incidentally, when the small rotary tool F is turned left, fine joining defects may occur on the right side in the advancing direction of the small rotary tool F, so that the tab members 71 and 72 are joined to the joint member 720. When friction stirring is performed along the portions J71 and J73 and the tab members 71 and 72 and the abutting portions J75 to J78 of the main body portion Q, the tab member 71 is disposed on the right side in the advancing direction of the small rotary tool F. , It is preferable to set the route of friction stir so that 72) is located. That is, when the small rotating tool F is turned left, the temporary joining end point p72 is moved from the temporary joining starting point p71 so that the small rotating tool F may move to the left along the outer edge (circumference) of the joint member 720. It is preferable to set the route of friction stirring leading to).

In addition, in this embodiment, although the route of the surface provisional bonding process was set as mentioned above, it is not limited to this route. In addition, it is not necessary to friction stir as a technique of drawing a brush.

(6) surface bone bonding process

Surface In this bonding step, friction stirring is performed in earnest from the surface A side with respect to the butt portion exposed to the surface A of the metal member 70 to be joined. That is, the surface-bonding process is a process of performing friction stirring with respect to the butt | matching part J72, J74 using the large rotating tool G larger than the small rotating tool F. As shown in FIG. In this embodiment, the friction stirring performed on the butt | matching part J72 is made into the 1st surface bone joining process, and the friction stirring performed on the butting part J74 is made into the 2nd surface bone bonding process.

In the surface-bonding process, as shown in FIG. 38, the starting position S _M2 and the end position E _M2 of friction stirring were provided in the 1st tab material 71, and were inserted in the starting position S _M2 . The large rotary tool G is relatively moved to the end position E _M2 without detaching it halfway. That is, in the surface bone bonding step, one large rotary tool G is moved to form a movement trajectory (bead) of one brush stroke, and the first surface bone bonding step and the second surface bone bonding step are continuously performed.

The surface-bonding process is explained in more detail. In the surface main joining process, first, the large rotary tool G is located directly on the lower hole (not shown) formed in the starting position S _M2 , and then the large rotary tool G is lowered while turning the large rotary tool G to the right to stir. (G2) The tip end portion (see Fig. 5B) is inserted into the lower hole not shown.

The entire stirring pin G2 enters the first tab member 71, and the entire surface of the lower end surface G11 (see FIG. 5B) of the shoulder portion G1 is the surface of the first tab member 71. In contact with each other, the large rotary tool G is relatively moved toward one end (first intersection c71) of the abutting part J72 while performing friction stir, and rushes into the abutting part J72 to make the first surface. This joining process is performed. When the large rotary tool G is moved, the metal around the stirring pin G2 is plastically fluidized in turn, and at the position away from the stirring pin G2, the metal which has been plastically fluidized again is hardened and the first surface is hardened. The plasticization region W72 is formed.

The moving speed (feeding speed) of the large rotary tool G is set depending on the size and shape of the stirring pin G2, the material and the thickness of the metal member 710 to be frictionally stirred, and the like. Mm / min).

When there exists a possibility that the heat input amount to the metal member 710 and the joint member 720 may become excessive, it is preferable to cool, for example, supplying water around the large rotary tool G. In addition, when coolant enters the abutting part J72, etc., there exists a possibility that an oxide film may generate | occur | produce in a joining surface. In this embodiment, a surface provisional bonding process is performed and the metal member 710 (main body part Q) is carried out. Since the joint of the joint member 720 is closed, there is no possibility that the quality of the joint will deteriorate as the cooling water becomes difficult to enter the abutting portion J72 and the like.

When the large rotary tool G intrudes into the butt | matching part J72, the route of friction stirring is set on the joint part of the main-body part Q and the joint member 720, and a large rotary tool G is made | formed along this route. By moving, friction stirring is performed continuously from the one end (1st intersection c71) of the butt | matching part J72 to the other end (2nd intersection c72).

When the large rotary tool G is relatively moved to the other end (second intersection c72) of the butt portion J72, the large rotary tool G is plunged into the second tab member 72 without being detached. Relatively moves to the one end part (third intersection c73) of the butt | matching part J74, performing friction stirring with respect to the 2nd tab material 72. As shown in FIG. That is, the route of the friction stirring from the second intersection c72 to the third intersection c73 is set in the second tab member 72.

When the large rotary tool G is relatively moved to one end (third intersection c73) of the abutting portion J74, the abutting portion J74 is intact without detaching the large rotary tool G from the third intersection c73. ), It is relatively moved to the fourth intersection c74, which is the other end of the butting part J74, while friction stirring is performed with respect to the butting part J74. That is, when the large rotary tool G is relatively moved to one end of the butting part J74, friction stirring is performed on the main body part Q of the other metal member 710 and the joint (boundary line) of the joint member 720. A 2nd surface main joining process is performed with respect to the butt | matching part J74 by setting a route and carrying out relative movement of the large rotating tool G along the said route.

When the large rotary tool G is relatively moved to the other end portion (fourth intersection point c74) of the butt portion J74, the large rotary tool G is plunged into the first tab member 71 without being separated. The relative movement is performed to the end position E _M2 while performing friction agitation with respect to the 1 tab material 71.

In addition, in the surface-bonding process, the large rotating tool G was rotated right from the start position S _M2 to the end position E _M2 , and friction stirring was performed by the method of drawing a brush, but the present invention is not limited thereto. no. For example, the large rotating tool G may be rotated to the left, and the large rotating tool G is once detached from any one of the first tab member 71 or the second tab member 72, which is not a trick of drawing a brush. You may perform friction stirring of the butt | matching part J72 or J74, respectively.

(7) 2nd step main bonding process

2nd step part In this joining process, the butt | matching part J720 of the step part R, R is referred to the back surface B side (back surface 717) side of the to-be-joined metal member 70 (refer FIG. 36 (b)). ]} Is subjected to frictional stirring. As shown in FIG. 39, when said surface bone joining process is complete | finished, the to-be-joined metal member 70 is released from the restraint of the friction stirring apparatus not shown, and the back surface B of the to-be-joined metal member 70 is shown. Re-install so that it comes upwards.

2nd step part This joining process is large along the butt | matching part J720 from the starting position S _M2 set to the 1st tab material 71 to the end position E _M2 set to the 2nd tab material 72. It is a process of performing friction stirring, without leaving rotating tool G. FIG. 2nd step part The 2nd step part plasticization area | region W74 is formed in the back surface B of the to-be-joined metal member 70 by this main bonding process. As shown in FIG. 31, the 2nd step part plasticization area | region W74 overlaps the 1st step part plasticization area | region W71. Thereby, the butt | matching part J720 which the stepped part R of the 1st metal member 710a and the stepped part R of the 2nd metal member 710b oppose is sealed over the full length of a depth direction. That is, the airtightness and watertightness between the side surfaces of the to-be-joined metal member 70 can be improved.

In addition, in this embodiment, although the 2nd step part main bonding process was performed after the surface main bonding, it is not limited to this, For example, you may carry out after a 1st step unit main bonding process.

(8) side bone bonding process

In the main bonding step, friction stir is applied to the butt portion exposed to the first side C and the second side D of the joined metal member 70, as shown in FIG. 40 (a). Do it. That is, a side bone bonding process includes the 1st side bone bonding process which carries out the friction stir of the 1st side surface C, and the 2nd side bone bonding process which carries out the friction stir of the 2nd side surface (D).

As shown in FIG. 40A, the tab member 750 is disposed in contact with the surface A of the metal member 70 to be joined, and is formed larger than the width of the joint member 720. In order to prevent the opening part of the to-be-joined metal member 70 and the tab material 750 from spreading at the time of friction stirring, it is welded together. The surface (upper surface) and the rear surface (lower surface) of the tab member 750 are flush with the first side C and the second side D (see FIG. 31) of the metal member 70 to be joined, respectively. Formed.

In the 1st side bone joining process, the small rotating tool F is relatively moved along the abutment part exposed to the 1st side surface C from the starting position S _M3 set on the surface of the tab member 750, and the end position E Friction stir until _M3 ). In this embodiment, the small rotating tool F is rotated to the right to perform the first side bone bonding step. After pressing the small rotating tool F to the starting position S _M3 and moving it to the starting point k71 of a 1st side bone joining process, the butt | matching part J72 will be removed, without leaving the small rotating tool F. FIG. Move along. At this time, since the small rotary tool F is subjected to friction stirring on the first surface plasticization region W72, the side surface plasticization region W75 and the first surface plasticization region frictionally agitated by the first side bone bonding process. (W72) can be duplicated.

When the small rotary tool F reaches the corner point k72, the abutment portion J710 between the bottom surface of the joint member 720 and the surface 716 of the step portion R of the first metal member 710a. And friction stir along the butt portion J711 between the lower surface of the joint member 720 and the surface 716 of the stepped portion R of the second metal member 710b. At this time, since the small rotary tool F is subjected to friction stirring on the first stepped plasticization region W71, the side step plasticized region W75 frictionally stirred by the first side bone joining process and the first stepped portion small. The torch regions W71 can overlap.

When the small rotary tool F reaches the corner point k73, friction stirring is performed along the butt | matching part J74. Then, when the small rotating tool F reaches the end point k74, the small rotating tool F is moved to the end position E _M3 as it is, and the small rotating tool F is detached from the tab member 750. At this time, since the small rotary tool F is subjected to friction stirring on the second surface plasticization region W73, the side surface plasticization region W75 and the second surface plasticization region frictionally agitated by the first side bone bonding process. (W73) can be duplicated.

In addition, it is preferable that starting position S _M3 and ending position E _M3 are set on the extension line of the butt | matching part J72 or J74, as shown to FIG. 40 (a). Thereby, the small rotating tool F can be moved in the shortest distance.

1st side According to this joining process, since the friction part can be agitated with the method of drawing a brush with respect to the butt part exposed to the 1st side surface C, work can be performed efficiently.

Here, in the above-described surface bonding process, the oxide film formed between the metal member 70 to be joined to the first tab member 71 and the second tab member 72 is formed inside the metal member 70 to be joined. There is possibility to wind up. Such an oxide film has a problem of being one cause of lowering the airtightness and watertightness of the joined metal member 70. However, according to the first side main bonding step, in the first surface plasticized region W72 and the second surface plasticized region W73, the oxide film exposed to the first side C can be sealed, and thus, The airtightness and watertightness can surely be improved.

In addition, the oxide film may be exposed to the surface A of the first surface plasticized region W72 and the second surface plasticized region W73 as shown in FIG. 31. In such a case, in order to seal such an oxide film, you may repair by friction stirring or welding. In addition, in this embodiment, although the 1st side bone joining process used the small rotating tool F which can cope relatively quickly, you may use the large rotating tool G. As shown in FIG.

2nd side Although this joining process is not shown in figure, it is a process of performing friction stirring with the technique of a brush stroke with respect to the butt part exposed to the 2nd side surface D of the to-be-joined metal member 70. FIG. Since the 2nd side bone bonding process is a process substantially the same as a 1st side bone bonding process, detailed description is abbreviate | omitted.

According to the joining method which concerns on this embodiment demonstrated above, 1st side surface C and 2nd with respect to the butt part exposed to the 1st side surface C and the 2nd side surface D of the to-be-joined metal member 70. FIG. The friction stir welding can be easily performed by performing friction stir according to the method of brush drawing from the side surface D.

As shown in FIG. 31, the first stepped portion plasticized region W71 and the second stepped portion plasticized region W74 are overlapped with each other, and the first surface plasticized region W72 and the side surface plasticized region are also overlapped. By overlapping the W75 and the second surface plasticized region W73 and the side plasticized region W75, the butt portion exposed to the side surface of the metal member 70 to be joined can be reliably sealed. Thereby, the airtightness and watertightness between the both sides of the to-be-joined metal member 70 can be improved.

Here, when friction-stirring the abutment parts J72 and J74 exposed to the to-be-joined metal member 70, a tunnel-shaped cavity defect (hereinafter, tunnel shape) which communicates with the 2nd side surface D from the 1st side surface C is here. There is a possibility of forming a cavity defect). Such a tunnel-shaped cavity defect is a factor of reducing the airtightness and watertightness of the to-be-joined metal member 70, but according to the joining process which concerns on this embodiment, these defects can be sealed suitably. Since the tunnel-shaped cavity defect is different from the site | part formed by the rotation direction and the advancing direction of a rotation tool, there are various combinations in the rotation direction and advancing direction of the rotation tool in each process. Hereinafter, the combination is demonstrated in detail.

That is, in friction stir welding, when moving a rotating tool while making a right rotation, there exists a possibility that a cavity defect may be formed in the advancing direction left side. On the other hand, when the rotary tool is turned left, there is a fear that the cavity defect is formed on the right side in the advancing direction. In view of this property, in order to fill a tunnel-shaped cavity defect appropriately, it is divided into the following 1st patterns and 2nd patterns.

It is a schematic perspective view which shows the joining method of a side bone bonding process, (a) is a 1st pattern, (b) is a figure which showed the 2nd pattern. Further, in the description of drawings, the said first side that proceed to the direction facing the second side (D) side are shown the direction N ₁ from (C), and the direction of progress in the opposite direction of the N _first moving direction N ₂ do.

<First pattern>

As shown in Fig. 41A, the first pattern is a tunnel-shaped cavity defect formed in the first surface plasticized region W72 and the second surface plasticized region W73 [790 (790a, 790b)]. ] Is a form formed in the 1st metal member 710a and the 2nd metal member 710b.

That is, in the first side surface C, the tunnel-shaped cavity defect 790a is formed in the first metal member 710a when (1-1) the rotation tool is set to the right turn in the advancing direction N ₁ , (1-2) In the case of setting to left turn in the traveling direction N ₂ .

On the other hand, in the first side surface C, the tunnel-shaped cavity defect 790b is formed in the second metal member 710b when (1-3) is set to the right turn in the advancing direction N ₂ . 4) when set to turn left at the advancing direction N _1. Therefore, in the surface-bonding process, there exist four methods mentioned above to become a form of a 1st pattern.

Next, the side bone bonding process in the case of a 1st pattern is demonstrated.

As shown in Fig. 41 (a), the one end surface of the tab member 750 has a starting position at either the starting point O ₁ or the starting point O ₂ which is one point on the extension line of the butt part J72 or the butt part J74. Is set.

When setting the starting position of the side bone joining step to the starting point O ₁ , it is preferable to rotate the rotary tool to the right and perform friction stirring. That is, if the start position is set to the starting point O ₁ and the rotation tool is set to the right turn to perform the side bone joining step, the frictional agitation of the right side of the traveling direction is ensured, so that the tunnel-shaped cavity defects 790a and 790b can be reliably sealed. Can be.

On the other hand, when setting the start position of the side surface of this bonding process to the origin O _2, it is desirable to turn the rotary tool. That is, when the start position is set to the starting point O ₂ and the rotation tool is set to the left turn to perform the side bone bonding process, the left side in the advancing direction is stably frictionally agitated, so that the tunnel-shaped cavity defects 790a and 790b are reliably It can be sealed.

As described above, in the first pattern, there are two methods for properly sealing the tunnel-shaped cavity defects 790a and 790b in the side bone bonding step. Therefore, in the first pattern, considering the surface-bonding process, the tunnel-shaped cavity defect 90 can be appropriately sealed by all eight bonding methods.

Next, the second pattern will be described. As shown in Fig. 41B, the second pattern is formed by jointing the tunnel-shaped cavity defects 790a and 790b formed in the first surface plasticized region W72 and the second surface plasticized region W73. It is a form formed in the member 720.

That is, in the first side surface C, the tunnel-shaped cavity defect 790a is formed in the joint member 720 in the (2-1) butt portion J72, and the rotating tool moves in the direction N ₁ . In the case of setting to the left turn in (2-2), in the abutting part J72, the rotating tool is set to the right turn in the advancing direction N ₂ .

On the other hand, in the first side surface C, the tunnel-shaped cavity defect 790b is formed in the joint member 720 (2-3) in the butt portion J74, in which the rotating tool is moved in the direction N _1. ) in the case of setting to the right, (2-4) a case of the butt in the unit (J74), sets the rotating tool to turn in the traveling direction (N _2). Therefore, in the surface-bonding process, there exist four methods mentioned above to become a form of a 2nd pattern.

Next, the side bone bonding step in the case of the second pattern will be described.

As shown in FIG. 41B, an end position of the tab member 750 is a starting position at either the starting point O ₁ or the starting point O ₂ , which is one point on the extension line of the butt part J72 or the butt part J74. Is set.

When setting the starting position of the side bone joining step to the starting point O ₁ , it is preferable to rotate the rotating tool to stir frictionally. That is, when the start position is set to the starting point O ₁ and the rotation tool is set to the left turn to perform the side bone joining step, the left side in the advancing direction is reliably sealed, so that the tunnel-shaped cavity defect 790a can be reliably sealed. .

On the other hand, when setting the start position of the side surface of this bonding process as a starting point O _2, it is desirable to bypass the rotary tool. That is, when the start position is set at the starting point O ₂ and the rotation tool is set to the right turn to perform the side bone joining step, the frictional stirring is surely performed on the right side in the direction of travel, so that the tunnel-shaped cavity defects 790a and 790b are reliably sealed. can do.

As described above, in the second pattern, in order to properly seal the tunnel-shaped cavity defects 790a and 790b in the side bone bonding step, there are two methods. Therefore, in the second pattern, considering the surface-bonding process, the tunnel-shaped cavity defect 90 can be properly sealed by all eight bonding methods.

[Seventh Embodiment]

FIG. 40B is a side view seen from the first side C side of the seventh embodiment. FIG. The joined metal member 70 according to the seventh embodiment differs from the sixth embodiment in that the height of the stepped portion R between the first metal member 710a and the second metal member 710b is large. That is, when the height of the butt | matching part J720 of step difference parts R is large, it becomes difficult to overlap the 1st step part plasticization area | region W71 and the 2nd step part plasticization area | region W74. In this case, it is preferable to friction stir the butt | matching part J720 in a side bone joining process.

That is, as shown to FIG. 40 (b), the side bone joining process of the joining method which concerns on 7th Embodiment further includes the process of carrying out the friction stirring of the butt | matching part J720.

The side bone bonding process which concerns on 7th Embodiment arrange | positions the tab material 760 made to contact a back surface B side in addition to the tab material 750 which makes contact with the surface A of the to-be-joined metal member 70. FIG. . The surface (upper surface) and the rear surface (lower surface) of the tab member 760 are formed so as to have a surface having the same height as the first side surface C and the second side surface D of the metal member 70 to be joined.

The side surface bonding process which concerns on 7th Embodiment sets the starting position to S _M3 of the 1st tab material 750, and then moves along the butt | matching part J72 and J710, rotating the small rotating tool F to the right. And when the small rotating tool F reaches the contact point k75 which the 1st metal member 710a, the 2nd metal member 710b, and the joint member 720 contact, friction stirring is performed along the butt | matching part J720. Do it. When friction stirring is performed over the entire length of the butt portion J720, the small rotating tool F is moved to the return point k76 set in the tab member 760 without being detached.

Then, the small rotary tool F is moved back to the butt portion J720 without moving away from the small rotary tool F, and the small rotary tool F is moved to the contact point k75, followed by the butt portion J711 and the butt portion J74. Friction stir and move to the end position (E _M3 ).

According to the second embodiment of the present invention, even when the height of the stepped portion R is large and the first stepped portion plasticized region W71 and the second stepped portion plasticized region W74 cannot be overlapped, The overlapping portion J720 can be sealed over the entire length by overlapping the side surface plasticization region W75, the first stepped portion plasticization region W71, and the second stepped portion plasticization region W74. Thereby, the watertightness and airtightness between the side surfaces of the to-be-joined metal member 70 can be improved. Moreover, since friction stir welding can be performed by the method of drawing a brush, work can be performed efficiently.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said form, A change suitable for the range which is not contrary to the meaning of this invention is possible.

For example, in the 6th embodiment, although the side bone joining process carried out the friction stirring on both surfaces of the 1st side surface C and the 2nd side surface D, you may carry out only in either one.

1: metal member to be joined
1a: first metal member
1b: second metal member
2: 1st tap material
3: 2nd tap material
70: metal member to be joined
700: recess
710a: first metal member
710b: second metal member
720: joint member
A: surface
B: If
C: first side
D: second side
F: small rotating tool
G: large rotating tool
J: Butt
K: concave groove
P: lower hole
U: Joint member
W, w: plasticization zone

Claims (13)

Joining method which carries out a friction stir welding by moving a rotating tool to the to-be-joined metal member formed by inserting a joint member in the hollow part which formed the 1st metal member and the 2nd metal member which have a recessed groove in the edge part by the said ends. ,
A surface side joining step of performing friction stir from the surface of the metal member to be joined with respect to the butt portion of the first metal member and the second metal member;
A back side joining step of performing friction stir from the back surface of the metal member to be joined to the butt portion of the first metal member and the second metal member;
From the side surface of the said to-be-joined metal member with respect to the butt | matching part of a said 1st metal member and a said 2nd metal member, the butt | matching part of a said joint member and a said 1st metal member, and the abutment part of the said joint member and a said 2nd metal member. The side joining process of performing friction stirring is included, The joining method characterized by the above-mentioned. The joining method according to claim 1, wherein the plasticized region formed in the front side joining step and the back side joining step is in contact with the joint member. The said side surface joining process of Claim 1,
Friction stirring of the plasticized area | region formed in the said front side joining process and the back side joining process with the said rotary tool, The joining method characterized by the above-mentioned. The joined part which has a 1st metal member and a 2nd metal member which have a recessed groove in an end surface, and a joint member inserted in the hollow part which formed the end surface of the said 1st metal member, and the side surface of the said 2nd metal member. It is a joining method of carrying out a friction stir welding by moving a rotating tool to a metal member,
A first insertion step of inserting the joint member into the concave groove of the first metal member;
A first main joining step of performing friction stir from a side surface of the first metal member with respect to the butt portion of the first metal member and the joint member;
A second insertion step of inserting the joint member into the concave groove of the second metal member such that the end face of the first metal member is against one side of the second metal member;
2nd main joining process which performs friction stirring from the surface and back surface of the to-be-joined metal member with respect to the abutment part of the end surface of the said 1st metal member and one side surface of the said 2nd metal member,
A third main joining step of performing friction stir from the end face of the second metal member to the butt portion of the first metal member and the second metal member and the butt portion of the second metal member and the joint member;
And a fourth main joining step of performing friction stir from the other side of the second metal member with respect to the butt portion of the second metal member and the joint member. The joined part which has a 1st metal member and a 2nd metal member which have a recessed groove in an end surface, and a joint member inserted in the hollow part which formed the end surface of the said 1st metal member, and the side surface of the said 2nd metal member. It is a joining method of carrying out a friction stir welding by moving a rotating tool to a metal member,
A third insertion step of inserting the joint member into the concave groove of the second metal member;
A fourth main joining step of performing friction stir from the other side of the second metal member with respect to the butt portion of the second metal member and the joint member;
A third main joining step of performing friction stir from the end face of the second metal member to the butt portion of the first metal member and the second metal member and the butt portion of the second metal member and the joint member;
A fourth insertion step of inserting the joint member into the concave groove of the first metal member such that the end face of the first metal member is against one side of the second metal member;
A second main joining step of performing friction stir from the front surface and the rear surface of the metal member to be joined to the abutment portion between the end surface of the first metal member and one side surface of the second metal member;
And a first main joining step of performing friction stir from the side surface of the first metal member with respect to the butt portion of the first metal member and the joint member. The plasticized area | region formed in the said 1st main joining process of Claim 4 or 5,
The plasticized region formed in the second main bonding step is overlapped,
A plasticized region formed in the second main bonding step;
The plasticized region formed in the third main bonding step is overlapped.
The plasticized region formed in the third main bonding step and
A joining method, wherein the plasticized region formed in the fourth main joining step is overlapped. It has a 1st metal member, a 2nd metal member, and a 3rd metal member which have a recessed groove in an end surface, and a joint member inserted into the said recessed groove, The said 1st metal member and the said 3rd metal on both sides of the said joint member. A friction stir welding is performed by moving a rotating tool to a to-be-joined metal member which shows a T-shape in the plane formed by inserting a member, and inserting a 2nd metal member between the said 1st metal member and a 3rd metal member. Joining method,
A fifth insertion step of inserting the first metal member and the third metal member into both sides of the joint member;
A fifth main joining step of performing friction stir from one side surface of the joint member to the butt portion of the first metal member and the joint member and the butt portion of the third metal member and the joint member;
A sixth insertion step of inserting the second metal member into the joint member;
An abutting portion between the end face of the first metal member and one side surface of the second metal member, an abutting portion between the second metal member and the joint member, an end face of the third metal member, and the second metal member A sixth main joining step of performing friction stir from the end face of the second metal member to the butt portion with the other side surface of the member;
Friction stirring is performed from the front and back surfaces of the metal member to be joined to the abutment portion between the end face of the first metal member and one side surface of the second metal member,
And a seventh main joining step of performing friction stir from the front surface and the rear surface of the metal member to be joined to the abutment portion between the end face of the third metal member and the other side surface of the second metal member. How to join. The plasticization region formed in the fifth main bonding step,
The plasticization region formed in the sixth main bonding step is overlapped,
A plasticized region formed in the sixth main bonding step;
A joining method, wherein the plasticized region formed in the seventh main joining step is overlapped. It is a joining method of carrying out friction stir welding by moving a rotating tool with respect to the butt | matching part of two metal members, and the joint member interposed between the said metal members, and the butt | matching part of each said metal member,
A step of joining the stepped portions of the two metal members provided with a stepped portion having a smaller thickness than the main body portion at an end of the main body portion to form a recessed portion between the main body portions;
1st step part main joining process which carries out friction stir from any one of a front surface and a back surface with respect to the butt | matching part of said step parts,
A joint member arrangement step of inserting the joint member into the recess and abutting the joint member with the main body portions;
A first surface bone joining step of performing friction stir from a surface with respect to the butt portion between the main body portion and the joint member of one of the metal members;
A second surface bone joining step of performing friction stir from the surface with respect to the butt portion between the main body portion and the joint member of the other metal member;
A side bone joining step of performing friction stir from a side surface with respect to the butt portion of the one metal member and the joint member, and the butt portion of the other metal member and the joint member,
Overlapping the plasticization region formed in the first stepped portion bonding process and the side bone bonding process;
The plasticized region formed in the first surface bone bonding step and the side bone bonding step is overlapped.
A joining method, wherein the plasticized region formed in the second surface bone bonding step and the side bone bonding step are overlapped. The second stepped portion main joining step according to claim 9, further comprising friction stir from the other of the front surface and the rear surface with respect to the butt portions of the stepped portions,
A joining method, wherein the plasticized region formed in the first stepped portion bonding step and the second stepped portion bonding step are overlapped. The bonding method according to claim 9, wherein in the side bone bonding step, friction stirring is performed over the entire length of the butt portions of the stepped portions. 10. The plasticized region formed by the first surface bone bonding step and the second surface bone bonding step, wherein the tunnel-shaped cavity defects communicating from one side to the other side face the metal member on one side and It is a case where it is formed in the said other metal member,
In the side bone bonding step,
When turning the said rotation tool to the right, set the starting position which concerns on the said side bone joining process so that the said joint member is located to the left of the advancing direction,
When rotating the said rotary tool left, the joining method characterized by setting the starting position which concerns on the said side bone joining process so that the said joint member is located to the right of the advancing direction. 10. The tunneling cavity defect according to claim 9, wherein in the plasticized region formed by the first surface bone bonding step and the second surface bone bonding step, tunnel-shaped cavity defects communicating from one side surface to the other side surface are formed only in the joint member. If yes,
When turning the said rotation tool to the right, set the starting position which concerns on the said side bone joining process so that the said joint member is located to the right of the advancing direction,
When turning the said rotary tool to the left, the joining method characterized by setting the starting position which concerns on the said side bone joining process so that the said joint member is located to the left of the advancing direction.

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