KR20120109615A - Joining method - Google Patents

Abstract

It is an object of the present invention to provide a joining method capable of easily joining abutting portions of a pair of metal members and increasing the airtightness and watertightness of the joined portion. The joining method which concerns on this invention WHEREIN: The butt | matching part J8 which abuts the said metal members in the structure (joint metal member N) formed by butt | matching the flat plate 14 which is a metal member, and the corner member R4. It is a joining method of, and after performing the friction stirring process which performs friction stirring from the outer surface A side of a structure with respect to the butt | matching part J8, the welding process which performs welding from the inner surface B side with respect to the butt | matching part J8 is carried out. It is characterized by performing.

Description

Joining method {JOINING METHOD}

The present invention relates to a joining method of a metal member using friction stirring.

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

For example, as shown in Fig. 35A, when the friction stir is performed on the butt portion J formed by abutting the end faces of the pair of metal members 101 and 101, the butt portion J The backing material 102 is arrange | positioned at the back surface side of), and friction stirring is performed along the butt | matching part J using the rotating tool G. Such techniques are described, for example, in Document 1 and Document 2.

Document 1. Japanese Patent Application Laid-Open No. 2001-225179 Document 2. Japanese Patent Application Laid-Open No. 2005-131666

However, according to the conventional joining method, as shown in FIG. 35 (b), since the metal members 101 and 101 are contracted in the joining portion, the joined metal members 101 deform without becoming horizontal. There was a problem that the quality of the product was deteriorated. For example, when inserting a joint member (not shown) into the groove portion 103 formed between the metal members 101 and 101, the bottom portion of the groove portion 103 does not become flat, so that the joint member can be disposed with high precision. There was a problem that there was not. In addition, due to shrinkage of the metal members 101 and 101, there was a concern that a cutout portion K was formed on the back surface side of the plasticized region W. FIG. Thereby, while the tensile strength in the junction part fell, the water-tightness and airtightness also fell.

Similarly, as shown in FIG. 35C, when the side surface of the metal member 105 and the end surface of the metal member 105 are joined vertically to each other, the metal member ( When friction stir is performed from the outside of the 105 and 105, there is a problem that one metal member 105 is bent due to the contraction of the metal members 105 and 105. Moreover, there existed a problem that the notch part E was formed in the corner part (inner corner part) inside the junction part of the metal member 105,105.

Here, for example, when friction stirring is performed from the back surface side of the metal members 101 and 101 or the inside of the metal members 105 and 105, this problem is solved. However, depending on the form of the abutment between the metal members to be joined, for example, in the case of performing friction stirring from the inside of the tubular structure or in the case of friction stirring the inner corner portion as shown in FIG. There existed a problem that it became difficult to operate a rotating tool appropriately by connection of a stirring apparatus.

From this point of view, an object of the present invention is to provide a joining method capable of easily joining abutting portions of a pair of metal members and increasing airtightness and watertightness.

The joining method which concerns on this subject is a joining method of the butt | matching part which abuts a pair of metal members, and performs the friction stirring process which performs friction stirring from one surface side with respect to the said butt | matching part, It is characterized by including the welding process of welding from the other surface side with respect to the.

According to this joining method, since friction agitation is performed from one side of a pair of metal members, welding is performed from the other side, so that even if a cutout is formed, it can be sealed with a weld metal, so that watertightness and airtightness are achieved. Can increase. In addition, according to the welding, problems such as connection of the device are solved, so that the joining operation can be performed relatively easily.

Moreover, this invention is the joining method of the butt | matching part which abuts the said metal member in the cylindrical structure formed butt | matching the some metal member, and friction stirring which performs friction stirring from the outer surface side of the said structure to the said butt | matching part. And a welding step of performing welding from the inner surface side of the structure to the butt portion, after performing the step.

According to this joining method, after friction stir is performed from the outside of the structure, welding is performed from the inside of the structure, so that even if a cutout portion is formed on the inner surface of the structure, it can be sealed with a weld metal, thereby improving watertightness and airtightness. Can be. In addition, according to the welding, even a structure surrounded by a metal member can be relatively easily joined from the inside of the structure.

Moreover, it is preferable that the plasticization area | region formed in the said friction stirring process and the welding metal formed in the said welding process contact. According to this joining method, since it is sealed over the full length of the depth direction of the butt part, the watertightness and airtightness of a joining part can be improved more.

Moreover, in the said welding process, it is preferable to include the welding metal filling process of filling a weld metal in the recessed part formed along the butt | matching part which appears on the said other surface. Moreover, in the said welding process, it is preferable to include the welding metal filling process of filling a weld metal in the recessed part formed along the butt | matching part which appears on the inner surface of the said structure. According to this joining method, welding workability can be improved.

Moreover, in the said friction stirring process, it is preferable to include the temporary joining process of performing temporary joining with a small rotating tool, before performing the main joining process of performing main bonding with a large rotating tool. According to this joining method, it is possible to prevent the abutment part from opening when performing main joining.

Moreover, it is preferable that the said friction stirring process includes the tab material arrangement | positioning process which arrange | positions a pair of tab material on both sides of the said abutment part, and the tab material provisional bonding process which performs friction stirring along the abutment part of the said tab material and the said metal member. . According to this joining method, setting of the insertion position and the detachment position of a rotation tool becomes easy by using a tab material.

Moreover, in the said friction stirring process, it is preferable to include the preliminary hole formation process which forms a preliminary hole in advance in the insertion planned position of the rotating tool which performs friction stirring. According to this joining process, the indentation resistance at the time of pushing in a rotary tool can be reduced. Thereby, the precision of friction stir welding can be improved, and a joining operation can be performed quickly.

Moreover, this invention is the joining method of the butt | matching part formed by abutting a pair of metal members, and after performing the welding process which welds from the other surface side with respect to the said butting part, friction stirring is performed from one surface side with respect to the said butting part. It is characterized by including the friction stirring process to be performed.

According to such a joining method, prior to the friction stirring process performed from one surface side, friction stirring can be performed in the state which attached the other surface side by welding from the other surface side. Thereby, since generation | occurrence | production of the notch which is easy to generate | occur | produce on the back surface (other surface) side of the surface on which friction stirring is performed can be prevented, the watertightness and airtightness of the metal member of a joint part can be improved. In addition, by welding from the other surface side, problems such as connection of the device are eliminated, and thus the joining operation can be performed relatively easily. Moreover, in a friction stirring process, since friction stirring can be performed in the state which temporarily attached the pair of metal members, workability can be improved.

Furthermore, in the cylindrical structure formed by abutting a plurality of metal members, it is a joining method of abutting portion formed by abutting the metal members, and after performing a welding step of welding from the inner surface side of the structure to the abutting portion, It is preferable to include the friction stir process which performs friction stir from the outer surface side of the said structure with respect to the butt | matching part.

According to such a joining method, by performing welding from the inner surface side of a structure before a friction stirring process performed from the outer surface side of a structure, friction stirring can be performed in the state which attached the inner surface side. Thereby, since generation | occurrence | production of the notch which is easy to generate | occur | produce on the back surface (inner surface of a structure) side of the surface on which friction stirring is performed can be prevented, the watertightness and airtightness of the metal member of a junction part can be improved. In addition, by welding from the inner surface side of the structure, problems such as connection of an apparatus when joining the inside of the structure are eliminated, and thus the joining operation can be performed relatively easily. Moreover, in a friction stirring process, since friction stirring can be performed in the state which temporarily attached the pair of metal members, workability can be improved.

The joining method which concerns on this invention can join easily the butt | matching part of a pair of metal member, and can improve airtightness and water tightness.

1 is a perspective view showing a structure according to a first embodiment.
2 is a plan view showing a structure according to the first embodiment.
3 is a view showing an intermediate member according to the first embodiment, wherein (a) is an exploded perspective view and (b) is a plan view.
4 is a perspective view illustrating a butting step according to the first embodiment.
FIG. 5: (a) is a perspective view which shows after the bonding process which concerns on 1st Embodiment, (b) is a perspective view which shows the groove part formation process which concerns on 1st Embodiment.
It is a perspective view which shows the tab material arrangement process which concerns on 1st Embodiment.
(A) is a side view which shows a small rotating tool, (b) is a side view which shows a large rotating tool.
8 is a plan view illustrating a provisional bonding step according to the first embodiment.
9 is a plan view illustrating the main bonding step according to the first embodiment.
10 is a cross-sectional view taken along the line II of FIG. 9.
11 is a side view illustrating a welding step according to the first embodiment.
It is a perspective view which shows the joint member insertion process which concerns on 1st Embodiment.
It is a perspective view which shows the tab material arrangement process which concerns on 1st Embodiment.
It is a top view which shows the outer side temporary bonding process which concerns on 1st Embodiment.
It is a figure which shows the outer side main bonding process which concerns on 1st Embodiment, (a) is a top view, (b) is sectional drawing along the II-II line of (a).
(A) is a side view which shows the recessed part formation process which concerns on 2nd Embodiment, (b) is a side view which shows the weld metal filling process which concerns on 2nd Embodiment.
(A) is a perspective view which looked at the structure which concerns on 3rd Embodiment from the outside, (b) is a perspective view which looked at the structure which concerns on 3rd Embodiment from inside.
18 is an exploded perspective view showing the structure according to the fourth embodiment.
(A) is a perspective view which shows the friction stirring process of 4th Embodiment, (b) is a partial perspective perspective view which shows the welding process of 4th Embodiment.
20 is a front view illustrating a butt step in accordance with a fifth embodiment.
21 is a perspective view illustrating a welding step according to the fifth embodiment.
It is a perspective view which shows the preparation step of the friction stirring process which concerns on 5th Embodiment.
FIG. 23A is an enlarged perspective view of a part of FIG. 22, and FIG. 23B is a perspective view illustrating a groove forming step.
It is a perspective view which shows the tab material arrangement process which concerns on 5th Embodiment.
It is a top view which shows the temporary bonding process which concerns on 5th Embodiment.
It is a top view which shows the main bonding process which concerns on 5th Embodiment.
FIG. 27 is a cross-sectional view taken along the line II of FIG. 26.
It is a figure which shows the welding process which concerns on 6th Embodiment, (a) is a figure which shows a recessed part formation process, (b) shows a weld metal filling process.
(A) is a perspective view which shows the butt process which concerns on 7th Embodiment, (b) is a perspective view which shows the welding process which concerns on 7th Embodiment.
(A) is a perspective view which shows the tab material arrangement process which concerns on 7th Embodiment, and (b) shows the friction stirring process which concerns on 7th Embodiment.
(A) is an exploded view of the to-be-joined metal member which concerns on 8th Embodiment, (b) is a figure which shows the butt process which concerns on 8th Embodiment, (c) is welding which concerns on 8th Embodiment. It is a figure which shows a process and a friction stirring process.
32 is a perspective view showing a structure according to an eighth embodiment.
33 is an exploded perspective view of the metal member to be joined according to the ninth embodiment.
FIG. 34A is a perspective view illustrating a welding process according to a ninth embodiment, and FIG. 34B is a perspective view illustrating a friction stirring process according to a ninth embodiment.
35 is a cross-sectional view showing a conventional bonding method.

[First Embodiment]

The bonding method which concerns on this invention is demonstrated in detail using drawing. About the joining method which concerns on this embodiment, as shown in FIG. 1, the case where the structure 1 which shows the cylindrical shape formed enclosed by four wall members H1, H2, H3, H4 is manufactured is taken as an example. Explain. In addition, in description, the hollow part side of the structure 1 is made into the inner side, and the opposite side is made into the outer side. Moreover, the surface which comprises the outer side which comprises the surface which comprises the inside of the structure 1 is made into the outer surface.

As shown in FIG. 1 and FIG. 2, the structure 1 according to the present embodiment is a cylindrical body having a hollow portion that is substantially rectangular in cross section. The structure 1 comprises four corners of the structure 1, and has corner members R1, R2, R3, and R4 that exhibit a substantially L shape in plan view, and corner members R1, R2, R3, and R4. It consists of the flat plates 11, 12, 13, and 14 provided between them, and the side end surface of each member is joined. The corner members R1 to R4 and the flat plates 11 to 14 are made of a friction stirable metal material such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium or magnesium alloy.

The wall member H1 is comprised by the corner members R1 and R4 arrange | positioned at intervals, and the flat plate 11 arrange | positioned between the corner members R1 and R4. The wall member H2 is comprised from the flat plate 12 arrange | positioned between the corner members R1 and R2. The wall member H3 is comprised from the corner members R2 and R3 arrange | positioned at intervals, and the flat plate 13 arrange | positioned between the corner members R2 and R3. The wall member H4 is comprised from the flat plate 14 arrange | positioned between the corner members R3 and R4, and the joint members U and U. As shown in FIG.

Butt part J1 of one side end surface of the corner member R4 and the other side end surface of the flat plate 11, and butt part J2 of the other side end surface of the corner member R1 and one side end surface of the flat plate 11 ) Is frictionally agitated from the outer side (outer surface) and the inner side (inner surface) of the wall member H1, and the tip end side of each plasticization region formed by the friction stirring is formed to overlap. In addition, a plasticization area shall include both the state heated by the frictional heat of the rotary tool mentioned later, and actually plasticized, and the state which the joining rotary tool passed and returned to normal temperature.

Similarly, abutment portion J3 of one side end surface of the corner member R1 and the other side end surface of the flat plate 12 and another side end surface of the corner member R2 and one side end surface of the flat plate 12 are also aligned. Part J4, one side end surface of the corner member R2 and the other side end surface of the flat plate 13 and the other end side surface J5 and the other side end surface of the corner member R3 and one side end surface of the flat plate 13 The abutting portion J6 is frictionally agitated from the outer surface side and the inner surface side of each wall member, and the tip end side of each plasticization region formed by friction stirring is formed to overlap.

On the other hand, the abutment part J7 of one side end surface of the corner member R3 and the other side end surface of the flat plate 14, and the abutment part of the other side end surface of the corner member R4 and one side end surface of the flat plate 14 J8 is characterized in that friction stir is performed from the outer surface side after being welded from the inner surface side of the wall member H4.

Hereinafter, the joining method of this embodiment is demonstrated in detail. In addition, since the U-shaped intermediate member is roughly equivalent to the conventional friction stir welding in the cross section which consists of wall members H1, H2, and H3, it demonstrates briefly.

The joining method which concerns on this embodiment is (1) intermediate member joining process, (2) butt process, (3) groove part formation process, (4) friction stirring process, (5) welding process, (6) joint member insertion process. , (7) outer temporary bonding step, and (8) outer main bonding step are mainly included.

(1) intermediate member bonding process

The intermediate member bonding step is a step of forming the intermediate member 20 (see FIG. 3B) as an intermediate of the structure 1. The intermediate member 20 is a member in which only the flat plate 14 is removed from the structure 1 and has a substantially U shape in cross section. The intermediate member 20 is a flat plate 12 (wall member H2) interposed between the wall member H1 and the wall member H3, which are disposed to face each other, and the wall member H1 and the wall member H3. Has In the intermediate member bonding step, after forming the wall member H1 and the wall member H3, respectively, the flat plate 12, the wall member H1, and the wall member H3 are joined.

The abutment part J1 of one side end surface of the corner member R4 and the other side end surface of the flat plate 11 is the inner surface side of the wall member H1 over the full length of the longitudinal direction of the abutting part J1, and It is joined by friction stir from the outer surface side. In addition, the front-end | tip side (thickness direction center part of the flat plate 11) of the plasticization area | regions W1 and W1 formed in the butt | matching part J1 overlaps. Thereby, since all the gaps of the depth direction of the butt | matching part J1 can be friction-stirred, airtightness and water tightness can be improved. Similarly, the abutment portion J2 of the other side end surface of the corner member R1 and one side end surface of the flat plate 11 is frictioned from the inner surface side and the outer surface side over the entire length of the abutment portion J2 in the longitudinal direction. Stirring is performed, and the front-end | tip side of the plasticization area | regions W2 and W2 overlaps.

The abutment part J5 of one side end surface of the corner member R2 and the other side end surface of the flat plate 13 is the inner surface side of the wall member H3 over the full length of the longitudinal direction of the abutting part J5, and It is joined by friction stir from the outer surface side. In addition, the front-end | tip side (thickness direction center part of the flat plate 13) of the plasticization area | regions W5 and W5 formed in the butt | matching part J5 overlaps. Thereby, since all the gaps of the depth direction of the butt | matching part J5 can be friction-stirred, airtightness and water tightness can be improved. Similarly, the abutment portion J6 of the other side end surface of the corner member R3 and one side end surface of the flat plate 13 is frictioned from the outer surface side and the inner surface side over the entire length of the abutment portion J6 in the longitudinal direction. Stirring is performed, and the front-end | tip part side of the plasticization area | regions W6 and W6 overlaps.

The flat plate 12 is interposed between the corner member R1 and the corner member R2 as shown in FIGS. 3A and 3B. The abutment part J3 of the other side end surface of the flat plate 12 and one side end surface of the corner member R1 is the inner surface side and the outer surface of the flat plate 12 over the full length of the longitudinal direction of the abutting part J3. It is joined by friction stir from the side. The tip end side (thickness center part of the flat plate 12) of the plasticization area | regions W3 and W3 formed in the butt | matching part J3 overlaps. Thereby, since all the gaps of the depth direction of the butt | matching part J3 can be friction-stirred, airtightness and water tightness can be improved. Similarly, the butt | matching part J4 of the other side end surface of the corner member R2, and the one side end surface of the flat plate 12 is the inner surface side of the flat plate 12 over the full length of the longitudinal direction of the butt | matching part J4. And friction stir from the outer surface side, and the tip end sides of the plasticized regions W4 and W4 overlap.

As shown in FIG. 3B, an opening portion 21 into which the flat plate 14 is inserted is formed in a part of the intermediate member 20. In addition, in this embodiment, although the friction stirring was performed from the both surfaces of the outer surface side and the inner surface side in each abutting part of the intermediate member 20, it is not limited to this. For example, welding may be performed from any one of the outer surface side and the inner surface side of the intermediate member 20, and friction stirring may be performed from the other side.

(2) butt process

In the butt step, as shown in FIG. 4, the flat plate 14 is inserted into the opening 21 (see FIG. 3B) of the intermediate member 20. The width of the flat plate 14 is formed substantially equal to the width of the opening portion 21. That is, when the flat plate 14 is inserted into the opening 21, the pair of side end surfaces R3b and R4a appearing in the opening 21 and the side end surfaces 14a and 14b of the flat plate 14 abut. As shown in FIG. 4, the other side end surface 14a of the flat plate 14 and the one side end surface R3b of the corner member R3 are joined, and the butt | matching part J7 is formed. On the other hand, one side end surface 14b of the flat plate 14 and the other side end surface R4a of the corner member R4 abut, and the butt | matching part J8 is formed.

In addition, the metal member formed by which the flat plate 14 and the corner member R4 were butted is also called the to-be-joined metal member N hereafter. In addition, the outer side surface A of the joined metal member N, the inner side surface B of the inner side surface B, the one end surface 1st end surface C, and the other end surface 2nd end surface D Also called.

At the time of the butt | matching process, it is preferable to arrange | position the backing stand 25 inside the intermediate member 20, as shown to FIG. 4 and FIG. The backing stand 25 is a member that supports the flat plate 14 from the inside of the intermediate member 20. The backing stand 25 is the vertical member (1) standing upright between the 1st backing material 25a, the 2nd backing material 25b, and the 1st backing material 25a and the 2nd backing material 25b which are arrange | positioned at spaced apart ( 25c, 25c). The distance from the outer surface of the first backing material 25a to the outer surface of the second backing material 25b is approximately equal to the distance from the inner surface of the flat plate 12 to the inner surface of the flat plate 14 (see FIG. 2). It is formed equally. In this embodiment, one backing stand 25 is provided for every butt | matching part J7, J8.

In addition, the (3) groove part formation process, (4) friction stirring process, (5) welding process, (6) joint member insertion process, (7) outer side temporary bonding process, and (8) outer side main bonding process described below Although it is a process performed with respect to the butt | matching part J7 and the butt | matching part J8, since the work content is substantially equal in both butt | matching parts, it demonstrates using the butt | matching part J8 as an example.

(3) groove forming process

In the groove forming step, the groove K is formed on the outer surface A of the metal member N to be joined with respect to the butt portion J8. In the groove portion forming step, as shown in FIG. 5B, the groove portion K is formed by cutting into a predetermined width and depth along the butt portion J8 using a known end mill or the like. In the present embodiment, the groove portion K is formed into a rectangle in cross section, but may be in another shape.

(5) friction stirring process

In the friction stirring step, as illustrated in FIG. 5B, friction stirring is performed using the large rotating tool G along the butt portion J8 appearing on the bottom surface of the groove K. FIG. In this embodiment, the friction stirring step includes a tab member arranging step of arranging a pair of tab members, a temporary joining step of temporarily joining the abutting portion J8, and a preliminary hole at an insertion scheduled position of the main joining step. And a preliminary hole forming step and a main bonding step of performing main bonding to the abutting portion J8.

Here, referring to FIG. 7, a rotation tool (hereinafter referred to as "small rotation tool F") and a rotation tool larger than the small rotation tool F (hereinafter referred to as "large rotation") used for each friction stir. Tool G "] will be described in detail.

The small rotating tool F shown in FIG. 7 (a) is made of a metal material harder than the metal member N to be joined such as tool steel, and has a shoulder portion F1 showing 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). The size and shape of the small rotary tool F may be set in accordance with the material, thickness, and the like of the metal member N to be joined, but at least smaller than the large rotary tool G (see FIG. 8B). This makes it possible to perform friction stir welding with a smaller load than when using the large rotary tool G, so that the load applied to the friction stir device can be reduced, and furthermore, the small rotary tool F Since the moving speed (feeding speed) can be made higher than the moving speed of the large rotary tool G, it is possible to reduce the work time and cost required for friction stir welding.

The lower end surface F11 of the shoulder part F1 is a site | part which plays a role which prevents scattering to the surroundings by pressing 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 descends perpendicularly from the center of the lower end surface F11 of the shoulder part F1, and is shape | molded in the shape of the truncated cone in this embodiment. Moreover, the stirring blade engraved in spiral shape is formed in the peripheral surface of the stirring pin F2. It stirred There are no particular limitations on the size of the outer diameter of the pin (F2), in the present embodiment, the maximum outer diameter (top end diameter) (X ₂₎ the maximum outer diameter (top end diameter) of the stirring pins (G2) of a large rotating tool (G) It is smaller than (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. In addition, the length L _A of the stirring pin F2 is smaller than the length L _B of the stirring pin G2 of the large rotary tool G.

The large rotating tool G shown to Fig.7 (b) consists of a metal material harder than the to-be-joined metal member N, such as tool steel, and has the shoulder part G1 which shows a cylindrical shape, and this shoulder part ( 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 descends perpendicularly from the center of the lower end surface G11 of the shoulder part G1, and is shape | molded in the shape of the truncated cone in this embodiment.

In the tab member arrangement step, as shown in Figs. 6 and 8, a pair of tab members are disposed on both end faces of the metal member N to be joined. The 1st tab material 31 and the 2nd tab material 32 are arrange | positioned so that the butt | matching part J8 may be fitted, and the butt | matching part J8 appearing in the 1st end surface C and the 2nd end surface D, respectively. It is provided with the dimensions and shape which can cover. The 1st tab material 31 and the 2nd tab material 32 are arrange | positioned at the 1st backing material 25a of the backing stand 25 in this embodiment. The surface of the 1st tab material 31 and the 2nd tab material 32 is formed in the surface of the same height as the bottom face of the groove part K. As shown in FIG. Although there is no restriction | limiting in particular in the material of the 1st tab material 31 and the 2nd tab material 32, In this embodiment, it is formed from the metal material of the same composition as the metal member N to be joined.

In addition, the to-be-joined metal member N, the 1st tab material 31, and the 2nd tab material 32 are joined by welding. Thereby, when performing below-mentioned friction stirring, it can prevent that the to-be-joined metal member N and each tab material spread.

In the temporary joining process, friction stirring is performed using the small rotating tool F along the butt | matching part J8 which appears in the bottom face of the groove part K. As shown in FIG. That is, as shown in FIG. 8, the small rotation tool F is located directly on the starting position S _P1 provided in place of the 1st tab material 31, and then the small rotation tool F is rotated to the right. While lowering, the stirring pin F2 (see FIG. _7A ) is pushed down to the starting position SP1. When the whole stirring pin F2 enters the 1st tap material 31, and the whole surface of the lower end surface F11 of the shoulder part F1 contacts the surface of the 1st tap material 31, the small rotating tool F The relative movement is made toward the starting point s1 of the provisional bonding step while rotating. When the small rotation tool F reaches the time point s1, it moves to the end point e1 of the provisional joining process, without leaving the small rotation tool F at the time point s1. Thereby leaving a small rotating tool (F) is the end point (e1) reaches to a small rotating tool (F) an without departure is moved to the end position (E _P1), small in the end position (E _P1) rotating the tool (F) .

Moreover, the stirring pin F2 of the small rotating tool F is the abutting part J31 of the to-be-joined metal member N and the 1st tab material 31, the to-be-joined metal member N, and the 2nd tab material 32 The force which tries to separate the to-be-joined metal member N and each tab material acts when it crosses the butt | matching part J32 of this, but the to-be-joined metal member N, the 1st tab material 31, and the 2nd tab material 32 Since the inner corner part formed by () is joined by welding, the gap between the to-be-joined metal member N, the 1st tab material 31, and the 2nd tab material 32 can be prevented. The end position E _P1 of the provisional bonding process becomes the start position S _M1 of the main bonding process mentioned later.

In addition, when performing a provisional welding process, the abutting part J31 of the to-be-joined metal member N and the 1st tab material 31, and the abutting part J32 of the to-be-joined metal member N and the 2nd tab material 32 are carried out. Therefore, you may perform friction stirring using the small rotating tool F (tab material temporary joining process). Thereby, since the to-be-joined metal member N, the 1st tab material 31, and the 2nd tab material 32 can be joined more firmly, the gap at the time of performing this later joining process can be prevented more. Moreover, workability | operativity can be improved by carrying out friction stir | fever continuously by the method of one-point notch of a tab material temporary joining process and a temporary joining process.

In the preliminary hole forming step, as shown in FIG. 7B, the preliminary hole P1 is formed at a starting position of friction stiring in the main bonding step described later. That is, in the preliminary hole formation process which concerns on this embodiment, the preliminary hole P1 is formed in the starting position S _M1 set in the surface of the 2nd tab material 32. As shown in FIG.

The preliminary hole P1 is formed in order to reduce the insertion resistance (pressing resistance) of the stirring pin G2 of the large rotating tool G. In this embodiment, the stirring pin F2 of the small rotating tool F is carried out. Is formed by expanding the punch hole n1, which is formed at the time of detachment), with a drill or the like (not shown). When the punch hole n1 is used, the formation process of the preliminary hole P1 can be simplified, and the work time can be shortened. Although there is no restriction | limiting in particular in the form of preliminary hole P1, In this embodiment, it is set as cylindrical shape. In addition, in this embodiment, although the preliminary hole P1 is formed in the 2nd tab material 32, there is no restriction | limiting in particular in the position of the preliminary hole P1, You may form in the 1st tab material 31, and suitably It is preferable to form on the extension line of the seam (boundary line) shown in the bottom face of the groove part K like this embodiment.

In this joining process, the butt | matching part J8 is joined in earnest using the large rotating tool G. In this joining process which concerns on this embodiment, friction stir is performed from the outer surface A side of the to-be-joined metal member N with respect to the butt | matching part J8 of the temporarily joined state using the large rotating tool G. .

In this bonding process, as shown in FIG. 9, the stirring pin G2 of the large rotating tool G is inserted (press-in) in the starting position S _M1 , and the inserted stirring pin G2 is detached | moved in the middle. It moves to the end position E _M1 without making it work. That is, in this bonding process, friction stirring is started from the preliminary hole P1, and friction stirring is performed continuously to the end position E _M1 .

In addition, in this embodiment, although the start position S _M1 of friction stirring is provided in the 2nd tab material 32 and the end position E _M1 is provided in the 1st tab material 31, the start position S _M1 ) And the end position (E _M1 ) are not intended to limit.

The main bonding process will be described in more detail with reference to FIG. 9.

First, the large rotating tool G is positioned directly above the start position S _M1 (spare hole P1), and then the large rotating tool G is lowered while turning the large rotating tool G to the right to reserve the tip of the stirring pin G2. Insert into the hole P1. When the whole of the stirring pin G2 enters the 2nd tap material 32, and the whole surface of the lower end surface G11 of the shoulder part G1 contacts the surface of the 2nd tap material 32, friction stirring is performed, The large rotary tool G is relatively moved toward one end of the butting part J8, and the inlet part J8 is plunged. When the large rotary tool G is moved, the metal around the stirring pin G2 is sequentially plasticized, and at the position spaced apart from the stirring pin G2, the metal that has been plastically fluidized is cured again and plasticized. A region (hereinafter referred to as "groove firing region W8") is formed (see FIG. 10).

When the amount of heat input to the to-be-joined metal member N may become excessive, cooling water by supplying water from the bottom surface (outer surface A side) of the groove part K around the large rotating tool G is cooled. desirable. In addition, when cooling water enters between the corner member R4 and the flat plate 14, there exists a possibility that an oxide film may generate | occur | produce in a joining surface. In this embodiment, provisional bonding process is performed and corner member R4 and flat plate ( Since the joint between 14) is blocked, it is difficult for cooling water to enter the joint between the corner member R4 and the flat plate 14, and there is no fear of deteriorating the quality of the joint.

In the abutment part J8 of the to-be-joined metal member N, the route of friction stirring is set on the movement trace on the joint of the to-be-joined metal member N, and the large rotating tool G is along the said route. By relatively moving, friction stirring is performed continuously from one end of the butt | matching part J8 to the other end. When the large rotary tool G is relatively moved to the other end of the butt | matching part J8, it moves relatively toward the end position E _M1 , performing friction stirring. When the large rotary tool G reaches the end position E _M1 , it raises, rotating the large rotary tool G, and disengages the stirring pin G2 from the end position E _M1 . When the main bonding step is completed, it is preferable to cut the burr and the like generated on the bottom face of the groove portion K to smooth the bottom face. Moreover, when this main bonding process is complete | finished, a pair of tap material is cut off.

(5) welding process

A welding process is a process of welding along the butt | matching part J8 from the inner surface B side of the to-be-joined metal member N. FIG. In the welding process, as shown in FIG. 11, the backing stand 25 is removed once, and the back part 25 is welded by TIG welding, MIG welding, etc. from inside of the groove part plasticization area | region W8, and the butt | matching part J8 is made. Thus, the weld metal T1 is formed. The additional welding is performed to the extent that the weld metal T1 protrudes from the inner surface B of the metal member N to be joined. By performing the welding process, even when a cutout portion is formed inside the groove-plasticized region W8, the cutout portion can be sealed, so that the strength, watertightness, and airtightness of the bonded portion can be increased. have. Further, even when the shrinkage occurs in the joint portion by the friction stir process and the corner member R4 and the flat plate 14 are not formed on the same plane, welding is performed from the inner surface B side of the metal member N to be joined. By doing so, the deformation caused by the shrinkage can be corrected.

Moreover, it is preferable to cut the part T1 'which protrudes from the inner surface B among the welding metal T1. Thereby, the inner surface B can be formed smoothly.

(6) Joint member insertion process

The joint member insertion process is a process of inserting the joint member U into the groove part K, as shown in FIG. The width, depth, and length of the joint member U are each formed in substantially the same dimensions as the width, depth, and length of the groove portion K, and are formed of a metal having the same composition as the metal member N to be joined. . That is, when the joint member U is inserted into the groove portion K, the surface of the joint member U and the outer surface A of the metal member N to be joined become a surface of the same height and the joint member U The both end faces of are formed to have the same height as the first end face C and the second end face D of the metal member N to be joined. In the joint member insertion process, since the deformation | transformation of the to-be-joined metal member N is corrected by said welding process, the bottom face of the groove part K is formed substantially horizontally. Thereby, the joint member U can be inserted suitably.

(8) Outer temporary bonding process

In the outer temporary joining step, as shown in FIGS. 13 and 14, the butt portion J8a of the flat plate 14 and the joint member U and the butt portion J8b of the corner member R4 and the joint member U are shown. ), Temporary welding is performed using the small rotating tool (F). The outer temporary joining step in the present embodiment includes a tab member arranging step for arranging a pair of tab members, and temporary joining using the small rotating tool F with respect to the butt portion J8a and the butt portion J8b. It includes an outer temporary joining step and a preliminary hole forming step of forming a preliminary hole at an insertion scheduled position of the large rotary tool G.

As shown in FIG. 13 and FIG. 14, the tab member arrangement step includes the first tab member 33 and the second tab member in the first end face C and the second end face D of the metal member N to be joined. 34 is placed. The first tab member 33 and the second tab member 34 are arranged to sandwich the butt portion J8, the butt portion J8a, and the butt portion J8b, respectively, and the first end face C and the second tab member 34 are respectively disposed. It is provided with the dimension and shape which can cover each abutment part shown by the end surface D. As shown in FIG. The 1st tab material 33 and the 2nd tab material 34 are arrange | positioned at the 1st backing material 25a of the backing stand 25 in this embodiment. The surfaces of the first tab member 33 and the second tab member 34 are formed substantially equal to the outer surface A of the metal member N to be joined. Although there is no restriction | limiting in particular in the material of the 1st tab material 33 and the 2nd tab material 34, In this embodiment, it forms with the metal material of the same composition as the metal member N to be joined.

In the outer temporary joining step, friction stirring is performed using the small rotating tool F along the butt portion J8a and the butt portion J8b appearing on the outer surface A of the metal member N to be joined. In the present embodiment, the outer temporary joining step is performed from the starting position S _P2 set on the first tab member 33 to the end position E _P2 set on the first tab member 33 as shown in FIG. 14. Friction stirring is performed by moving the small rotating tool F relative to the bending method.

That is, the outer temporary joining step includes the first tab member temporary joining step of joining the first tab member 33 and the abutting portion J33 of the metal member N to be joined, and the flat plate 14 and the joint member U. The first outer temporary joining step of joining the butt parts J8a, the second tab member temporary joining step of joining the butt parts J34 of the second tab member 34 and the metal member N to be joined, and the corner member ( And a second outer temporary joining step of joining R4) and the abutting portion J8b of the joint member U to each other.

In the 1st tap material provisional bonding process, after pressing the small rotation tool F to the starting position S _P2 set to the 1st tab member 33, the small rotation tool F is a viewpoint of a 1st tap material provisional bonding process. Relative movement to (s33). When the small rotating tool F reaches the time point s33, the small rotation tool F is moved along the butt portion J33 to the end point e33 of the first tab member temporary bonding step. When the small rotary tool F reaches the end point e33, the small rotary tool F does not leave the first rotary member F, and once enters the first tab member 33, and moves to the starting point s14 of the first outer temporary bonding process. Let's do it.

In addition, when the small rotary tool F is rotated to the right, since there is a possibility that a fine void defect may occur on the left side of the small rotary tool F in the advancing direction, the small rotary tool F may be on the right side in the advancing direction of the small rotary tool F. It is preferable to set the position of the start point s33 and the end point e33 of the first tab member temporary joining step so that the metal member N to be joined is located. By doing in this way, since a cavity defect hardly arises on the side to be joined metal member N, it becomes possible to obtain a high quality joined body.

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 of the small rotary tool F in the advancing direction, and therefore, to be joined to the left side of the small rotating tool F in the advancing direction. It is preferable to set the position of the start point and the end point of the first tab member temporary bonding step so that the metal member N is located. Although illustration is abbreviate | omitted specifically, the viewpoint is provided in the position of the end point e33 when the small rotation tool F is made to turn right, and at the position of the starting point s33 when the small rotation tool F is turned right. It is good to install an end point.

When the small rotating tool F reaches the time point s14 of the first outer temporary bonding step, the process proceeds to the first outer temporary bonding step as it is, and the small rotating tool F is moved along the butt portion J8a. When the small rotating tool F reaches the end point e14 of the first outer temporary bonding process, the small tapping tool F enters the second tab member 34 and is moved to the time point s34 of the second tab member temporary bonding process. When the small rotating tool F reaches the time point s34, the small rotating tool F is moved along the butt portion J34 to the end point e34 of the second tab member temporary bonding process.

When the small rotation tool F reaches the end point e34, it moves to the time point sR4 of a 2nd outer side temporary welding process, without leaving the small rotation tool F. As shown in FIG. When the small rotation tool F reaches sR4, the small rotation tool F is moved along the butt | matching part J8b, and it transfers to a 2nd outer provisional bonding process as it is. When the small rotation tool F reaches the end point eR4 of the 2nd outer provisional bonding process, it will intrude into the 1st tap material 33 as it is, and the small rotation tool F will be disengaged from the end position E _P2 . In addition, end position E _P2 is also the starting position S _M2 of the outer side main bonding process mentioned later.

When the outer provisional bonding process is completed, a preliminary hole is formed using a punch hole (not _shown ) formed at the end position E _P2 . Since the preliminary hole forming step is substantially equivalent to the above, the description thereof is omitted.

(9) Outside main bonding step

The outer main joining step is a step of authentically joining the abutting portions J8a and J8b appearing on the outer surface A of the metal member N to be joined. In the outer side main bonding process which concerns on this embodiment, the outer surface A of the to-be-joined metal member N with respect to the butt | matching part J8a and the butt | matching part J8b of the temporarily bonded state using the large rotating tool G. Friction stirring is performed from the side.

In the outer main joining step, as shown in FIG. 15A, the stirring pin G2 of the large rotary tool G is inserted into the starting position S _M2 , and the inserted stirring pin G2 is midway. Move to the end position (E _M2 ) without deviating from. In this embodiment, the position of the first taepjae start position of the friction stir in the (33) (S _M2) and end position (E _M2) the installation, but the start position (S _M2) and the end position (E _M2) It is not intended to limit the scope.

The outer main bonding step will be described in more detail with reference to FIGS. 15A and 15B.

First, as shown in Fig. 15A, the large rotary tool G is positioned directly above the preliminary hole (starting position S _M2 ), and then the large rotary tool G is lowered while turning to the right. The tip end of the stirring pin G2 is inserted into a spare hole. When the whole stirring pin G2 enters the 1st tap material 33 and the whole surface of the lower end surface G11 of the shoulder part G1 contacts the surface of the 1st tap material 33, it joins, performing friction stirring. The large rotary tool G is relatively moved toward one end of the portion J8b, and is made to rush to the butt portion J8b. When the large rotary tool G is moved, the metal around the stirring pin G2 is sequentially plasticized, and at the position spaced apart from the stirring pin G2, the metal that has been plastically fluidized is cured again and plasticized. A region (hereinafter referred to as "outer plasticized region W8 '") is formed.

And the large rotary tool G is reciprocated (two reciprocations in this embodiment) so that the formed outer side plasticization area | region W8 'may not contact the abutting part J34 and the abutting part J33, and the abutting part J8b and Friction stirring is performed continuously along the butt portion J8a. Finally, the large rotating tool G is separated from the end position E _M2 set in the first tab member 33 by passing through the butt portion J33.

As shown in FIG.15 (b), it is preferable to carry out friction stirring so that the front-end | tip part side of outer side plasticization area | region W8 'may contact the bottom face of groove part K. As shown to FIG. By this structure, friction stirring can be performed over the full length of the butt | matching part J8a and the butt | matching part J8b in the depth direction. In addition, by reciprocating while shifting the large rotary tool G, the interface between the lower surface of the joint member U and the bottom surface of the groove portion K can be frictionally stirred over the entire surface, whereby the watertightness and the airtightness can be further improved.

Furthermore, the oxidizing film of the butt part J34 and the butt part J33 is made by reciprocating the large rotation tool G so that the outer side plasticization area | region W8 'may not contact the butt part J34 and the butt part J33. Can be prevented.

According to the joining method of this embodiment demonstrated above, as shown in FIG. 11, the to-be-joined metal member N (structure 1) with respect to the abutting part J8 of the flat plate 14 and the corner member R4. After the friction stir is performed from the outside, welding is performed from the inside, so that even if a cutout portion (see (b) and (c) of FIG. 35) is formed at the butt portion J8 appearing on the inner surface B, for example, welding is performed. Since it can seal with metal (T1), watertightness and airtightness can be improved and the joint strength of a junction part can be improved. In addition, according to welding, even if the structure 1 is surrounded by wall members, for example like this embodiment, joining operation | work can be performed comparatively easily from the inside, without restricting the connection of a machine.

Moreover, when the groove part plasticized area | region W8 and the welding metal T1 contact, it can seal over the full length of the depth direction of the butt | matching part J8. Further, by performing the temporary joining step before performing each step of the friction stir step and the outer main joining step, it is possible to prevent gaps during the main joining of the butt portion.

As mentioned above, although embodiment of this invention was described, it can change suitably in the range which does not deviate from the meaning of this invention. In description of other embodiment, the description which overlaps with 1st Embodiment is abbreviate | omitted.

For example, in 1st Embodiment, although joining was performed using the joint member U, when the wall member of the to-be-joined metal member N is large, the some joint member U and the groove part are large. You may join by (K). On the other hand, when the thickness of the to-be-joined metal member N is small, welding may be performed from the inside after performing friction stirring from the outside of the to-be-joined metal member N, without using the joint member U. FIG.

[Second Embodiment]

For example, as shown in FIG. 16, when performing said welding process, it joins in the front-end | tip side (inner surface B of the to-be-joined metal member N) of the groove part plasticization area | region W8. You may include the recessed part formation process which forms the recessed part M1 along the part J8, and the welding metal filling process which fills the recessed part M1 with the weld metal T2. According to this joining method, workability at the time of welding can be improved. In addition, the inner surface B can be smoothly formed by cutting the part T2 'which protrudes from the inner surface B of the to-be-joined metal member N among the weld metal T2. In addition, in this embodiment, although the recessed part M1 was formed in rectangular shape by the cross section, it may be another shape.

[Third embodiment]

In the joining method which concerns on 3rd Embodiment, as shown in FIG. 17, butt | matching part J10 is formed in the side surface of one 1st metal member 1a, and the end surface of the other 2nd metal member 1b. It differs from 1st Embodiment in that it is made. That is, in the first embodiment, the corner members R1 to R4 are used to contact the side end faces of each member to form a structure, but as in the present embodiment, the side end of one metal member and the side end of the other metal member are formed. The structure may be formed to face each other. In the present embodiment, for example, the pair of first metal members 1a and the pair of second metal members 1b are formed so as to form a rectangular cylindrical structure 50 when viewed in cross section. .

The joining method which concerns on this embodiment is the structure 50 (joint metal member N1) with respect to the butt | matching part J10 formed by making the side surface of the 1st metal member 1a and the side end surface of the 2nd metal member 1b abut. ) And a welding step of welding from the inner surface B side of the structure 50 to the friction stirring step of performing friction agitation from the outer surface A side.

In the welding process which concerns on this embodiment, after performing friction stirring from the outer surface A of the to-be-joined metal member N1 formed from the 1st metal member 1a and the 2nd metal member 1b, the inner corner part I ) Is welded to the corner portion inside the first metal member 1a and the second metal member 1b. In other words, the weld metal T3 is formed over the entire length of the butt portion J10 appearing on the inner surface of the metal member N to be joined by welding. Thereby, even if the cutout part (refer FIG. 35 (c)) was formed in the inner corner part I in the friction stirring process, since the cutout part can be sealed by welding, water tightness and airtightness are improved At the same time, the strength of the joined portion can be increased. In addition, as shown in FIG.35 (c), even if one metal bends by shrinkage | contraction at the time of joining, the said curvature can be corrected by welding. Moreover, although it is difficult to carry out friction stirring with respect to the inner corner part I, welding can perform a bonding operation comparatively easily. Moreover, you may form so that the plasticization area | region W10 formed by the friction stir process and the welding metal T3 formed by the welding process may contact and improve water tightness and airtightness.

[Fourth Embodiment]

As shown in FIG. 18 and FIG. 19, the joining method which concerns on 4th Embodiment consists of a cylindrical member 10a which shows a cylindrical shape, and the cover member 10b which covers the edge part of the cylindrical member 10a. It differs from 1st Embodiment in the point. The joining method which concerns on this embodiment includes the friction stirring process of performing friction stirring with respect to the butt | matching part J11, and the welding process which welds to the inner corner part I '.

The structure 60 which concerns on this embodiment is provided with the butt | matching part J11 formed which the edge part of the cylindrical member 10a and the one surface of the cover member 10b were formed. In the friction stir process, as shown in FIG. 19A, the counterclockwise direction is seen from the front side of the lid member 10b while turning right by the large rotary tool G along the butt portion J11. It moves to and performs friction stirring.

After performing a friction stirring process, as shown to FIG. 19 (b), welding is performed with respect to the inner corner part I 'inside the structure 60. FIG. By forming the weld metal T3 with respect to the inner corner portion I ', the strength of the joined portion can be increased, and the airtightness and water tightness can be enhanced. Moreover, according to the welding process, even if the cylindrical structure 60 which concerns on this embodiment eliminates problems, such as connection of an apparatus, joining operation can be performed comparatively easily.

In addition, it is preferable that the large rotating tool G moves counterclockwise when seen from the front side of the cover member 10b. Thereby, since there exists a high possibility that a defect may generate | occur | produce on the cover member 10b side, the airtightness and water tightness of the cylindrical member 10a can be improved. In addition, in this embodiment, although the cylindrical member 10a and the lid member 10b are joined, you may join the side end surface of a pair of cylindrical member 10a face to face.

* 5th embodiment

The joining method according to the fifth embodiment to the ninth embodiment described below is the joining method according to the first to fourth embodiments in that the friction stir step is performed from the outside after the welding step is performed from the inside of the structure. Is different. The bonding method which concerns on 5th Embodiment demonstrates the process of manufacturing the structure 1 shown in FIG. 1 as an example.

The joining method which concerns on this embodiment is (1) intermediate member joining process, (2) butt process, (3) welding process, (4) groove part formation process, (5) friction stirring process, (6) joint member insertion process. , (7) outer temporary bonding step, and (8) outer main bonding step are mainly included.

(1) intermediate member bonding process

The intermediate member bonding step is a step of forming the intermediate member 20 (see FIG. 3B) as an intermediate of the structure 1. Since an intermediate member bonding process is equivalent to 1st Embodiment, description is abbreviate | omitted.

(2) butt process

In the butt step, as shown in FIG. 20, after the top and bottom of the intermediate member 20 are inverted, the flat plate 14 is inserted into the opening 21 (see FIG. 3B) of the intermediate member 20. do. The width of the flat plate 14 is formed substantially equal to the width of the opening portion 21. In other words, when the flat plate 14 is inserted into the opening 21, the pair of side end surfaces R3b and R4a appearing in the opening 21 and the side end surfaces 14a and 14b of the flat plate 14 respectively abut. As shown in FIG. 20, the butt | matching part J7 is formed in the abutment surface of the other side end surface 14a of the flat plate 14, and the one side end surface R3b of the corner member R3. On the other hand, the butt | matching part J8 is formed in the abutment surface of one side end surface 14b of the flat plate 14, and the other side end surface R4a of the corner member R4.

In addition, the (3) welding process, (4) groove part formation process, (5) friction stirring process, (6) joint member insertion process, (7) outer side temporary bonding process, and (8) outer side main bonding process which are described below Although it is a process performed with respect to the butt | matching part J7 and the butt | matching part J8, since the work content is substantially equal in both butt | matching parts, it demonstrates using the butt | matching part J8 as an example.

In addition, as shown in FIG. 21, the metal member formed by which the flat plate 14 and the corner member R4 were butted is also called the to-be-joined metal member N2. In addition, the outer side surface A of the joined metal member N2, the inner surface B of the inner surface B, the first end surface C of one end surface, and the second end surface D of the other end surface Also referred to as (see FIG. 25).

(3) welding process

A welding process is a process of welding along the butt | matching part J8 from the inner surface B side of the to-be-joined metal member N2. In a welding process, as shown in FIG. 21, the toothed welding, such as TIG welding or MIG welding, is performed and the welding metal T1 is formed along the butt | matching part J8. The additional welding is performed to the extent that the weld metal T1 protrudes from the inner surface B of the metal member N2 to be joined. By performing a welding process, when performing a main bonding process (friction stirring process) mentioned later, it can prevent that a cutout part (Kissing Bond) is formed in the inner surface B side of the butt | matching part J8. In addition, it is preferable to cut the part which protrudes from the inner surface B among the welding metal T1. Thereby, the inner surface B can be formed smoothly.

(4) groove forming process

In the groove portion forming step, as shown in FIGS. 22 and 23, the groove portion K is formed on the outer surface A side of the butt portion J8 along the longitudinal direction of the butt portion J8. Here, it is preferable to arrange | position the backing stand 25 inside the intermediate | middle member 20 in a groove part formation process, a friction stirring process mentioned later, a joint member insertion process, an outer side temporary bonding process, and an outer side main bonding process. Since the groove portion forming step is substantially the same as in the first embodiment, description thereof is omitted.

(5) friction stirring process

In a friction stirring process, as shown to FIG. 23 (b), friction stirring is performed using the large rotating tool G along the butt | matching part J8 shown in the bottom face of the groove part K. As shown to FIG. In the present embodiment, the friction stir step includes a tab member arrangement step (see FIGS. 24 and 25) for arranging a pair of tab members, a temporary joining step (see FIG. 25) for temporarily joining the abutting portion J8, The preliminary hole forming process of forming a preliminary hole in the insertion scheduled position of a main bonding process, and the main joining process (refer FIG. 26) which performs main bonding with respect to the butt | matching part J8 are included. Since the tab material arrangement step, the temporary bonding step and the main bonding step are substantially the same as in the first embodiment, detailed description thereof will be omitted.

As shown in FIG. 27, in this bonding process which concerns on this embodiment, friction stir so that the welding metal T1 formed in the inner surface B and the groove part plasticization area | region W8 formed in the outer surface A may contact. It is desirable to set the depth. Thereby, since it can seal over the full length of the butt | matching part J8 in the depth direction, watertightness and airtightness can be improved. Moreover, when this main bonding process is complete | finished, it is preferable to cut the burr etc. which generate | occur | produced in the bottom face of the groove part K, and to make a bottom face smooth. Moreover, when this main bonding process is complete | finished, a pair of tap material is cut off.

In addition, since the (6) joint member insertion process, (7) outer temporary bonding process, and (8) outer main bonding process are substantially the same as 1st Embodiment, description is abbreviate | omitted.

According to the joining method of this embodiment demonstrated above, it welds from the inner surface B side prior to the friction stirring process (main bonding process) performed from the outer surface A side of the to-be-joined metal member N2 (structure 1). By performing a process, friction stirring can be performed in the state which the inner surface B temporarily attached. As a result, it is possible to prevent the occurrence of cutting bonds on the inner surface B side of the to-be-joined metal member N2, that is, on the rear surface side of the surface on which friction stirring is performed, so that the watertightness and airtightness of the joined portion are prevented. It can increase.

In addition, welding is performed from the inner surface B side of the structure 1, so that the limitation of the connection of the device and the like is eliminated as compared with the case of performing the friction agitation, so that the joining operation can be performed relatively easily. Moreover, in a friction stirring process, since friction stirring can be performed in the state which temporarily attached the pair of metal members, workability can be improved.

In addition, as shown in FIG. 27, the depth direction of the butt portion J8 can be sealed by bringing the weld metal T1 into contact with the groove-plasticized region W8.

[Sixth Embodiment]

Next, a sixth embodiment of the present invention will be described. In the welding process which concerns on 5th Embodiment, although welding was performed directly to the butt | matching part J8, similarly to the welding process which concerns on 6th Embodiment, even if recessed part M1 is formed along the butt | matching part J8 beforehand. good. In addition, since the joining method which concerns on 6th Embodiment is the same as that of 5th Embodiment except a welding process, description of another process is abbreviate | omitted.

The welding process which concerns on 6th Embodiment is an inner surface B of the to-be-joined metal member N2 which consists of a flat plate 14 and the corner member R4, as shown to FIG. 28 (a) and (b). The recessed part formation process of forming recessed part M1 along the butt | matching part J8 shown by this, and the welding metal filling process of filling weld metal T2 with respect to recessed part M1 are included.

In the recess forming step, as shown in Fig. 28A, the recess M1 is a predetermined width and depth from the inner surface B along the longitudinal direction of the butt portion J8 using a known end mill. ). In this embodiment, although the recessed part M1 was formed in the rectangle in cross section, it may be another shape. What is necessary is just to set the depth of the recessed part M1 suitably according to the depth of the plasticization area | region in the friction stir process performed later.

In the weld metal filling step, as shown in FIG. 28B, the weld metal T2 is filled in the recess M1. In the weld metal filling step, depressed welding such as MIG welding or TIG welding is performed to the concave portion M1 to protrude the weld metal T2 from the inner surface B. FIG. About the part of the welding metal T2 which protruded from the inner surface B, the inner surface B can be smoothly formed by cutting along the inner surface B. FIG.

In this way, in the welding step, the workability of the welding step can be improved by performing the recess forming step and the weld metal filling step. In addition, in this embodiment, although the recessed part M1 was made after abutting the corner member R4 and the flat plate 14, it is not limited to this, The corner part of the corner member R4 and the flat plate 14 is cut out in advance. After the notches are formed, the recesses M1 may be formed to face these notches.

[Seventh Embodiment]

Next, a seventh embodiment of the present invention will be described. In 7th Embodiment, as shown in FIG. 29, the edge part of the 1st metal member 111a which is a pair of flat plate-shaped metal member, and the edge part of the 2nd metal member 111b are joined vertically, and are joined. Is different from the sixth embodiment. In the joining method according to the seventh embodiment, the method includes (1) abutting step, (2) welding step, and (3) friction stirring step.

(1) butt process

In the butt process, as shown to FIG. 29A, the edge part of the 1st metal member 111a and the edge part of the 2nd metal member 111b are abutted at right angle. The first metal member 111a and the second metal member 111b have a flat plate shape and are made of a metal material capable of friction stirring, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. At the end of the first metal member 111a, the concave groove portion 141 cut into a rectangle in a cross-sectional view with a width approximately half the width of the plate width of the first metal member 111a and the first metal member 111a. A protrusion 142 is formed which protrudes to form a rectangle when viewed in cross section at approximately half the width of the plate width. Similarly, at the end of the second metal member 111b, the concave groove portion 143 cut into a rectangle in cross section with a width of approximately half the width of the plate width of the second metal member 111b, and the second metal member 111b. A projection 144 is formed to protrude to have a rectangular shape when viewed in cross section at approximately half the width of the plate.

In the butt step, the protrusion 144 of the second metal member 111b is brought into contact with the concave groove portion 141 of the first metal member 111a, so that the first metal member 111a and the second metal member 111b are brought into contact with each other. Align approximately vertically. Thereby, the butt | matching part J110 is formed in the mating surface of the 1st metal member 111a and the 2nd metal member 111b. As shown in FIG. 29 (b), it is viewed from the front in the first end surface C of the to-be-joined metal member N3 formed by butting the first metal member 111a and the second metal member 111b. When the butt portion J110 formed in an approximately crank shape appears.

(2) welding process

In a welding process, as shown to FIG. 29 (b), welding is performed to the butt | matching part J110 shown by the inner corner part I of the to-be-joined metal member N3. Here, the inner corner portion I refers to an inner corner portion formed of the first metal member 111a and the second metal member 111b. In other words, in the welding step, from the inner surface B (inside of the metal member N3 to be joined) of the metal member N3 to be welded, such as TIG welding or MIG welding, along the longitudinal direction of the butt portion J110. Is done. Moreover, in the weld metal T3 formed by the welding process, it is preferable to cut | disconnect and form smoothly about the part which protruded from the inner surface B of the to-be-joined metal member N3.

(3) friction stirring process

The friction stirring process according to the present embodiment includes a tab member installation step of providing the tab member 146 to the metal member N3 to be joined, and a main bonding step of performing friction stirring from the outer surface A side to the butt portion J10. It includes. In the tab member installation step, as shown in FIG. 30A, a pair of tab members 146 are disposed on the first end surface C and the second end surface (not shown) of the metal member N3 to be joined. Install. The tab member 146 is a plate member made of the same composition as the metal member N3 to be joined, and is formed to have a thickness substantially equal to the plate thickness of the second metal member 111b. The tab member 146 is disposed such that the outer surface A of the metal member N3 to be joined and the upper surface of the tab member 146 are flush with each other, and are joined to the metal member N3 to be joined by welding. .

In this joining process, friction stirring is performed along the abutting part J110 from the outer surface A side of the to-be-joined metal member N3 using the large rotating tool G. As shown in FIG. In this embodiment, on the tab member 146, the start position S _M3 is set on the extension line of the butt | matching part J110, and an end position is set to the other tab member which is not shown in figure. And friction stirring is performed along the butt | matching part J110 using the large rotating tool G. As shown in FIG. 30 (b), the plasticized region W110 is formed in the butt portion J110 by the main bonding step.

Moreover, when a rotation tool rotates to the right, a cavity defect may be formed in the advancing direction left, and when it rotates to the left, the cavity defect is formed. Therefore, for example, as shown in FIG. 30 (a), in the present embodiment, the large rotating tool G is rotated to the left to move the butt portion J110 from the starting position S _M3 of the tab member 146. It is preferable to move along. Thereby, even if a cavity defect is formed, it can form in the position far from the inside of the to-be-joined metal member N3.

According to the joining method according to the present embodiment, even when a pair of metal members are joined to each other vertically, watertightness and airtightness can be improved. That is, the friction stirring can be performed in a state where the inner surface B is attached by performing the welding step from the inner surface B side prior to the friction stirring process performed from the outer surface A side of the metal member N3 to be joined. . As a result, it is possible to prevent the occurrence of cutting bonds on the inner surface B side of the to-be-joined metal member N3, that is, on the rear surface side of the surface on which friction stirring is performed, so that the watertightness and airtightness of the joined portion are prevented. It can increase. Moreover, by welding from the inner surface B of the to-be-joined metal member N3, joining operation | work can be performed comparatively easily even in the place where friction stirring like the inner corner part I is difficult. Moreover, in a friction stirring process, since friction stirring can be performed in the state which temporarily attached the pair of metal members, workability can be improved. Further, by welding from the inner surface B side of the metal member N3 to be joined, it is possible to prevent the second metal member 111b from bending to the outer surface A side by thermal contraction of the plasticized region W110. have.

[Eighth Embodiment]

Next, an eighth embodiment of the present invention will be described. The joining method which concerns on 8th Embodiment is a modified example of 7th Embodiment, and differs from 7th Embodiment by the point which has a recessed part in inner corner part I. The joining method which concerns on 8th Embodiment includes (1) abutting process, (2) welding process, and (3) friction stirring process.

(1) butt process

In the butting step, as shown in FIG. 31A, the end portion of the first metal member 151a and the end portion of the second metal member 151b are aligned at right angles. The first metal member 151a and the second metal member 151b exhibit a plate shape, and are made of a metal material capable of friction stirring, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. The first metal member 151a includes the main body portion 152, the first stepped portion 153 formed thinner than the main body portion 152, and the second stepped portion 154 formed thinner than the first stepped portion 153. Has The length p of the 2nd step part 154 is formed substantially equal to the plate | board thickness of the 2nd metal member 151b. The length q of the first stepped section 153 is formed smaller than the length of the second stepped section 154.

In the butting step, as shown in FIG. 31B, the end surface 155 of the second metal member 151b is brought into contact with the second stepped portion 154 of the first metal member 151a. Then, the rectangular concave portion M2 is formed by the main body portion 152, the first stepped portion 153, and the second metal member 151b of the first metal member 151a in cross section. That is, the recessed part M2 is formed along the butt | matching part J111 shown by the inner corner part I of the to-be-joined metal member N4 which consists of the 1st metal member 151a and the 2nd metal member 151b. .

(2) welding process

In the welding step, as shown in FIG. 31 (c), a depressed welding such as TIG welding or MIG welding is performed on the concave portion M2 formed along the butt portion J111 of the metal member N4 to be joined. . Moreover, in the weld metal T4 formed by the welding process, it is preferable to cut | disconnect and form smoothly about the part which protruded from the inner surface B of the to-be-joined metal member N4.

(3) friction stirring process

In a friction stirring process, friction stirring is performed using the large rotating tool G from the outer surface A side of the butt | matching part J111. About a friction stirring process, since it is substantially the same as 7th Embodiment, detailed description is abbreviate | omitted.

According to the joining method according to the present embodiment, the same effect as that in the seventh embodiment can be obtained, and even when the first metal member 151a and the second metal member 151b are perpendicularly abutted, the concave portion M2 ), The welding operation can be easily performed.

In addition, although the detailed description is abbreviate | omitted, as shown in FIG. 32, the 1st metal member 151a, the 2nd metal member 151b, and the 1st metal member 151a using the joining method which concerns on 8th Embodiment. Can be formed into a rectangular cylindrical structure 150 as viewed in a cross-section consisting of a third metal member 151c which is a member equivalent to the second metal member 151c and a fourth metal member 151d which is a member equivalent to the second metal member 151b. have. Such a structure 150 can be used, for example, as a vacuum container. In addition, if necessary, the plasticized region W111 formed by the friction stir process and the weld metal T4 formed by the welding process may be overlapped to increase the airtightness and water tightness.

[Ninth Embodiment]

Next, a ninth embodiment of the present invention will be described. In the joining method which concerns on 9th Embodiment, as shown to FIG. 33 and FIG. 34, the cylindrical member 161a which shows a cylindrical shape, and the cover member 161b which covers the edge part of the cylindrical member 161a are joined. do. 9th Embodiment is a modification of 4th Embodiment. The joining method which concerns on this embodiment includes (1) abutting process, (2) welding process, and (3) friction stirring process.

In the butt step, as shown in FIG. 33, the end face of the cylindrical member 161a is brought into contact with the lid member 161b. The cylindrical member 161a is a metal member representing a cylinder. The end of the cylindrical member 161a has a concave groove portion 162 cut into a rectangle when viewed in cross section at half the width of the plate thickness, and a protrusion projecting to exhibit a rectangle when viewed in cross section at half the width of the plate thickness. Has 163.

The cover member 161b is a member that covers the opening of the cylindrical member 161a without a gap, and protrudes into a disc-shaped main body 164 and one end of the main body 164 and shows a circular shape when viewed in cross section. Has 165. The protrusion 165 is formed concentrically with the main body 164, and is formed smaller than the diameter of the main body 164.

As shown in FIG. 34, the cylindrical member 161a and the lid member 161b abut, and the recessed groove part 162 of the cylindrical member 161a makes contact with the protrusion part 165 of the lid member 161b. . The cylindrical member 161a and the lid member 161b abut, and the butt | matching part J112 is formed. The member which consists of a cylindrical member 161a and the cover member 161b is made into the to-be-joined metal member N5.

(2) welding process

In the welding process, as shown to FIG. 34A, welding is performed along the butt | matching part J112 formed in the inner corner part I 'of the to-be-joined metal member N5. In the present embodiment, the toothed welding such as TIG welding or MIG welding is performed on the inner surface B of the to-be-joined metal member N5 so that the weld metal T5 is formed in a circular shape in plan view.

(3) friction stirring process

In the friction stirring step, as illustrated in FIG. 34B, the friction stirring is performed along the butt portion J112 from the outer surface A side of the metal member N5 to be joined using the large rotating tool G. As shown in FIG. Do it. In the friction stirring step, friction stirring is performed by moving the large rotary tool G right along the butt portion J112 while moving counterclockwise from the front side of the lid member 161b. Thus, by setting the lid member 161b to the left in the advancing direction by rotating the large rotary tool G to the right, there is a high possibility that a cavity defect is formed on the lid member 161b side. Thereby, a cavity defect can be formed in the position spaced apart from the hollow part of the to-be-joined metal member N5.

According to the joining method which concerns on 9th Embodiment, even when joining the cylindrical member 161a and the lid member 161b which covers the one end side of the cylindrical member 161a, watertightness and airtightness can be improved. That is, the inner surface B is temporarily attached by performing a welding process from the inner surface B side of the to-be-joined metal member N5 before the friction stirring process performed from the outer surface A of the to-be-joined metal member N5. Friction stirring can be performed. In addition, welding is performed from the inner surface B of the metal member N5 to be joined, so that problems such as connection of the device can be solved even at a location where friction stirring, such as the inner corner portion I ', is difficult. I can do it. Moreover, since a welding process is performed before a friction stirring process and metal members can be attached and attached, the operation of a friction stirring process can be performed easily.

As mentioned above, although embodiment of this invention was described, it can change suitably in the range which is not contrary to the meaning of this invention. For example, in a welding process, it is not limited to TIG welding or MIG welding, You may employ | adopt another well-known welding method.

1: structure
11 to 14: reputation
31: tap material
32: tap material
F: small rotating tool
G: large rotating tool
H1 to H4: wall member
J: Butt
M1: recess
P1: spare hole
R1 to R4: corner member
T: welded metal
W: plasticization zone

Claims (9)

It is a joining method of the butt part formed by facing a pair of metal members,
After performing the welding process of forming the weld metal along the said butt part by performing the welding by TIG welding or MIG welding from one surface side of the said metal member with respect to the said butt part,
And a friction stir step of performing friction stir from the surface side on the opposite side of the one surface side of the metal member with respect to the butt portion. In the tubular structure formed by abutting a plurality of metal members, it is a joining method of the butt portion formed by abutting the metal members,
After performing the welding process of forming the weld metal along the said butt part by performing the welding by TIG welding or MIG welding from the inner surface side of the said structure to the said butt part,
And a friction stir step of performing friction stir from the outer surface side of the structure with respect to the butt portion. The joining method according to claim 1 or 2, wherein the welding metal formed in the welding step is brought into contact with the plasticized region formed in the friction stir step. The said welding process includes the welding metal filling process of filling the said welding metal in the recessed part formed along the butt | interval part which appears in the said other surface, The joining method of Claim 1 characterized by the above-mentioned. The said welding process includes the welding metal filling process of filling the said welding metal in the recessed part formed along the butt | matching part which appears in the inner surface of the said structure, The joining method of Claim 2 characterized by the above-mentioned. The said friction stirring process WHEREIN: The provisional bonding process of Claim 1 or 2 which performs provisional bonding with a small rotating tool before performing the main bonding process which performs main bonding with a large rotating tool is used. The joining method characterized by the above-mentioned. The tab member arrangement step according to claim 1 or 2, wherein in the friction stirring step, a tab member arrangement step of arranging a pair of tab members on both sides of the abutting portion, and a tab member which performs friction stirring along the abutment portion of the tab member and the metal member. A bonding method, comprising a bonding step. The said friction stirring process WHEREIN: The joining method of Claim 1 or 2 including the preliminary hole formation process which forms a preliminary hole in advance in the insertion scheduled position of the rotating tool which performs friction stirring. In the structure formed by butt | matching the cylindrical member which shows a cylindrical shape, and the cover member which covers the edge part of a cylindrical member,
It is a joining method of the butt part which abuts the side surface of the metal member of the said cover member, and the side end surface of the metal member of the said cylindrical member,
After performing a welding process for forming a weld metal along the butt portion by performing a bite welding by TIG welding or MIG welding from the inner corner portion of the structure to the butt portion,
And a friction stir step of performing friction stir from the outer surface side of the structure with respect to the butt portion.

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