JP2019000881A - Junction method - Google Patents

Abstract

To provide a junction method which prevents contamination from occurring at inner corners between metal members and is capable of increasing water-tightness and air-tightness.SOLUTION: A junction method includes: an outer corner friction agitation step of inserting only the agitation pin F2 of a first rotary tool F from the end face 1a of a first metal member 1 and the second side face 2c of a second metal member 2 to relatively move along the first butt part J1, and to bring the first butt part J1 into friction agitation junction; an auxiliary member arrangement step of arranging an auxiliary member 4 on the front member 1b of the first metal member 1; and a first butt part friction agitation step of inserting only the agitation pin F2 from the front face 4a side of an auxiliary member 4 to bring the first butt part J1 into friction agitation junction. In the first butt part friction agitation step, the first butt part J1 is brought into friction agitation junction in a state that only the agitation pin F2 keeps contact with only the first metal member 1 and the auxiliary member 4, or both the first metal member 1, the second metal member 2, and the auxiliary member 4.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a joining method for friction stir welding of metal members.

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a method in which the metal members are fixed together by rotating the rotary tool along the abutting portion between the metal members and plastically flowing the metal at the abutting portion by frictional heat between the rotating tool and the metal member. Phase joining is performed.

  For example, in the joining method according to Patent Document 1, after performing overlay welding on the inner corners of the metal members that are butted in an L-shaped cross section, the friction stir welding is performed from the outer corners of the metal members. .

JP 2010-284704 A

  However, in the conventional friction stir welding method, overlay welding is performed at the inner corners of the metal members, and thus there is a problem that contamination occurs at the inner corners.

  From such a viewpoint, it is an object of the present invention to provide a bonding method capable of preventing the occurrence of contamination in the inner corners of metal members and improving water tightness and air tightness.

  In order to solve such a problem, the present invention is a joining method, in which a plate-shaped first metal member having a stepped portion formed on the back surface of an end portion is prepared, and a plate-shaped second metal member is prepared. A preparing step, a step bottom surface of the step portion of the first metal member, and an end surface of the second metal member are abutted to form a first abutting portion, a step side surface of the step portion, A butting step of abutting the first side surface of the two metal members to form a second butting portion, inserting a stirring pin of a rotating tool from the end surface of the first metal member and the second side surface of the second metal member, An outer corner friction stir process in which the rotary tool is relatively moved along the first abutting portion to friction stir weld the first abutting portion; and along the first abutting portion on the surface of the first metal member. Auxiliary part that arranges auxiliary members so that they come into surface contact A first abutting portion friction in which the agitating pin is inserted from the surface side of the auxiliary member, the rotating tool is relatively moved along the first abutting portion, and the first abutting portion is friction stir welded. In the first butting portion friction stirring step, only the stirring pin contacts the first metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member. In this state, the first butted portion is friction stir welded.

  Further, the present invention is a joining method, comprising preparing a plate-like first metal member having a stepped portion formed on the back surface of the end portion, and preparing a plate-like second metal member, A step bottom surface of the step portion of the first metal member and an end surface of the second metal member are abutted to form a first butting portion, a step side surface of the step portion, and a first side surface of the second metal member And a stirring step of forming a second butting portion, and the stirring pin of the second rotary tool having a shoulder portion and a stirring pin from the end surface of the first metal member and the second side surface of the second metal member. With the shoulder portion in contact with the first metal member and the second metal member, the second rotating tool is relatively moved along the first abutting portion, and the first abutting portion is Outer corner friction stirring process for friction stir welding; Auxiliary member arranging step of arranging an auxiliary member so as to be in surface contact with the surface of the first metal member along the first abutting portion, and inserting a stirring pin of the first rotating tool from the surface side of the auxiliary member A first abutting portion friction agitating step of relatively moving the first rotating tool along the first abutting portion to frictionally weld the first abutting portion, and the first abutting portion friction agitating step Then, in the state where only the stirring pin of the first rotating tool is in contact with the first metal member and the auxiliary member, or the first metal member, the second metal member and the auxiliary member, the first butting The parts are friction stir welded.

According to this joining method, since welding is not performed at the inner corners of the metal members, it is possible to prevent the occurrence of contamination.
Further, since the friction stir welding is performed from two directions with respect to the first butting portion, water tightness and air tightness can be improved.
In addition, by providing the stepped portion, it is possible to prevent the positional deviation between the first metal member and the second metal member in the butting process.
Moreover, while joining a 1st metal member and a 2nd metal member, in addition to a 1st metal member and a 2nd metal member, an auxiliary member can also carry out friction stir welding simultaneously, and can prevent the metal shortage of a junction part. it can.
Moreover, when only a stirring pin is inserted, the load concerning a friction stirrer can be reduced. Moreover, when performing friction stir welding in the state which the shoulder part was made to contact, generation | occurrence | production of a burr | flash can be suppressed.

Moreover, it is preferable to include the removal process which removes the said auxiliary member in which the burr | flash was formed from said 1st metal member.
According to this joining method, since the burrs generated in the friction stir welding can be removed from the metal member together with the auxiliary members, the process of removing the burrs becomes easy.

  Further, in the first butting portion friction stirring step, when the stirring pin is inserted in the central portion of the auxiliary member, or in the first butting portion friction stirring step, the first rotation is performed in the central portion of the auxiliary member. When the agitation pin of the tool is inserted, the metal shortage at the joint can be more reliably prevented.

Further, when a line passing through the end face of the auxiliary member and orthogonal to the surface of the first metal member is used as a reference line, in the first abutting portion friction stirring step, the rotation center axis of the rotary tool and the reference line The rotating tool may be moved relative to each other so that they overlap, and the joining conditions may be set so that burrs generated in the friction stir welding are formed on the auxiliary member.
Further, when a line passing through the end face of the auxiliary member and orthogonal to the surface of the first metal member is used as a reference line, in the first butt portion friction stirring step, the rotation center axis of the first rotary tool and the The first rotating tool may be relatively moved so as to overlap the reference line, and the joining conditions may be set so that burrs generated in the friction stir welding are formed on the auxiliary member.
If it does in this way, the operation | work which removes a burr | flash can be performed more easily.

Further, when a line passing through the end face of the auxiliary member and perpendicular to the surface of the first metal member is used as a reference line, in the first butt portion friction stirring step, after the friction stirring is performed, the rotation tool To the extent that the auxiliary member remains only on one side, the rotational center axis of the rotary tool is shifted slightly to the center side of the auxiliary member relative to the reference line, and the rotary tool is relatively moved and remains. Bonding conditions may be set so that burrs are formed on the auxiliary member.
Further, when a line that passes through the end face of the auxiliary member and is orthogonal to the surface of the first metal member is used as a reference line, in the first butting portion friction stirring step, the first rotation is performed after the friction stirring is performed. To the extent that the auxiliary member remains only on one side of the tool, the rotation center axis of the first rotary tool is shifted slightly to the center side of the auxiliary member relative to the reference line, and the first rotary tool is relatively moved. The joining conditions may be set so that burrs are formed on the remaining auxiliary member while being moved.
If it does in this way, while the operation | work which removes a burr | flash can be performed more easily, the metal shortage of a junction part can be prevented more reliably.

  Further, in the outer corner friction stirring step, when the first butting portion is friction stir welded in a state where only the stirring pin is in contact with the first metal member and the second metal member, a friction stirrer is provided. Can reduce the load.

In addition, before performing the outer corner friction stirring step or the first butting portion friction stirring step, from the end surface of the first metal member and the second side surface side of the second metal member to the first butting portion It is preferable to further include an outer corner temporary joining step for performing spot tacking.
Further, before performing the outer corner friction stirring step or the first butting portion friction stirring step, the second corner from the inner corner formed by the back surface of the first metal member and the first side surface of the second metal member. It is preferable to further include an inner corner provisional joining step for performing spot tacking on the butt portion.
According to this joining method, since the first metal member and the second metal member can be temporarily fixed, it is possible to prevent openings in the first butting portion friction stirring step and the outer corner friction stirring step.

  According to the joining method according to the present invention, it is possible to prevent the occurrence of contamination in the inner corners of the metal members, and to improve water tightness and air tightness.

It is sectional drawing which shows the preparatory process and matching process which concern on 1st embodiment. It is a perspective view which shows the tab material arrangement | positioning process which concerns on 1st embodiment. It is a perspective view which shows the outer corner friction stirring process which concerns on 1st embodiment. It is sectional drawing which shows the outer corner friction stirring process which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member arrangement | positioning process which concerns on 1st embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process which concerns on 1st embodiment. It is a perspective view which shows the 1st butting part friction stirring process which concerns on 1st embodiment. It is sectional drawing which shows the 1st butting part friction stirring process which concerns on 1st embodiment. It is sectional drawing which shows the 1st butt | matching part friction stirring process after 1st embodiment. It is sectional drawing which shows the removal process which concerns on 1st embodiment. It is a perspective view which shows the outer corner temporary joining process which concerns on the modification of 1st embodiment. It is a perspective view which shows the inner corner temporary joining process which concerns on the modification of 1st embodiment. It is sectional drawing which shows the 1st butting part friction stirring process which concerns on 2nd embodiment. It is sectional drawing which shows the outer corner friction stirring process which concerns on 2nd embodiment. It is sectional drawing which shows the outer corner friction stirring process which concerns on 3rd embodiment. It is sectional drawing which shows the outer corner friction stirring process which concerns on the modification of 3rd embodiment. It is sectional drawing which shows the 1st butt | matching part friction stirring process before 4th embodiment. It is sectional drawing which shows the 1st butting part friction stirring process which concerns on 4th embodiment. It is sectional drawing which shows after the 1st butt | matching part friction stirring process which concerns on 4th embodiment. It is sectional drawing which shows before the 1st butting part friction stirring process which concerns on 5th embodiment. It is sectional drawing which shows the 1st butting part friction stirring process which concerns on 5th embodiment. It is sectional drawing which shows after the 1st butt | matching part friction stirring process which concerns on 5th embodiment. It is sectional drawing which shows the 1st butting part friction stirring process which concerns on 6th embodiment.

[First embodiment]
The joining method according to the first embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, in the joining method according to the first embodiment, the first metal member 1 and the second metal member 2 are butted in an L shape and joined. The joining method according to the first embodiment includes a preparation process, a butting process, a tab material arranging process, an outer corner friction stirring process, an auxiliary member placing process, a first butting part friction stirring process, and a removing process. I do. In the following description, “front surface” means a surface opposite to the “back surface”.

The preparation step is a step of preparing a first metal member 1 and a second metal member 2 as shown in FIG. The first metal member 1 and the second metal member 2 are plate-like metal members.
The materials of the first metal member 1 and the second metal member 2 are appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy.
A step portion 11 is formed on the back surface 1 c of the end portion of the first metal member 1. The step portion 11 is composed of a step bottom surface 11a and a step side surface 11b rising vertically from the step bottom surface 11a. The width dimension of the step bottom surface 11 a is the same as the plate thickness dimension of the second metal member 2.

A butt | matching process is a process which butt | matches the 1st metal member 1 and the 2nd metal member 2 in L shape, as shown in FIG.
In the butting step, the end surface 2a of the second metal member 2 is butted against the step bottom surface 11a of the first metal member 1 to form the first butting portion J1, and the first side surface 2b of the second metal member 2 is disposed on the step side surface 11b. A second butting portion J2 is formed by butting. The end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2 are flush with each other. An inner corner is formed by the back surface 1 c of the first metal member 1 and the first side surface 2 b of the second metal member 2.

As shown in FIG. 2, the tab material arranging step is a step of arranging the tab materials T and T at both ends of the first metal member 1 and the second metal member 2 (only one is drawn in FIG. 2).
The tab material T is a plate-like metal member made of the same material as the first metal member 1. The thickness of the tab material T is the same as the thickness of the first metal member 1.
In the tab material arranging step, the side surface of the tab material T is butted against the side surface 1d of the first metal member 1, and the butted portion is joined by welding. The surface Ta of the tab material T and the surface 1b of the first metal member 1 are flush with each other, and the back surface Tb of the tab material T and the back surface 1c of the first metal member 1 are flush with each other. Further, the side surface Tc of the tab member T and the end surface 1a of the first metal member 1 are flush with each other.

As shown in FIGS. 3 and 4, the outer corner friction stirring step is a step of inserting the first rotating tool F from the outer corner and friction stir welding the first abutting portion J1. The outer corner means the opposite side of the inner corner, and in the first embodiment, it is composed of the surface 1b of the first metal member 1, the end surface 1a, and the second side surface 2c of the second metal member 2.
The 1st rotation tool F is comprised by the connection part F1 and the stirring pin F2, and is formed, for example with tool steel. The connection part F1 is a part attached to a friction stirrer (not shown) and has a cylindrical shape. The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1.

A spiral groove is formed on the outer peripheral surface of the stirring pin F2. In the first embodiment, in order to rotate the first rotating tool F to the right, the spiral groove is formed counterclockwise as it goes from the proximal end to the distal end of the stirring pin F2.
In addition, when rotating the 1st rotation tool F counterclockwise, it is preferable to form a spiral groove clockwise as it goes to the front-end | tip from the base end of the stirring pin F2.
By setting the spiral groove in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the quantity of the metal which overflows outside the 1st metal member 1 and the 2nd metal member 2 can be decreased.

  In the outer corner friction stirring step, as shown in FIG. 3, the first rotating tool F rotated to the right is inserted into the start position Sp set on the side surface Tc of the tab material T, and from the near side to the far side in FIG. 3. The first rotary tool F is relatively moved along the first abutting portion J1. A plasticized region W2 is formed on the movement locus of the first rotary tool F. As shown in FIG. 4, the insertion depth of the stirring pin F2 may be set as appropriate.

  The first rotating tool F is preferably attached to a robot arm having a driving unit such as a spindle unit at the tip. Thereby, when performing an outer corner friction stirring process, the rotation center axis | shaft of the 1st rotation tool F can be inclined easily.

As shown in FIGS. 5 and 6, the auxiliary member arranging step is a step of arranging the auxiliary member 4 so as to overlap the first metal member 1.
The auxiliary member 4 is a planar plate-like member. The auxiliary member 4 is not particularly limited as long as it is a metal capable of friction stirring, but in the first embodiment, the auxiliary member 4 is made of the same material as the first metal member 1 and the second metal member 2.
The plate | board thickness of the auxiliary member 4 is suitably set so that the plasticization area | region W1 (refer FIG. 9) after the 1st butt | matching part friction stirring process mentioned later may not run short of a metal. The planar shape of the auxiliary member 4 is the same shape as the end surface 2 a of the second metal member 2.

  In the auxiliary member arranging step, the auxiliary member 4 is superimposed on the surface 1b of the first metal member 1 so that the back surface 4b of the auxiliary member 4 is in surface contact with the surface 1b of the first metal member 1. Further, the auxiliary member 4 is disposed along the first butting portion J1. Further, the side edge portion of the auxiliary member 4 is arranged in accordance with the side edge portion of the surface 1 b of the first metal member 1. Thereby, the auxiliary member 4 is disposed immediately above the end surface 2 a of the second metal member 2.

As shown in FIGS. 7 and 8, the first butting portion friction stirring step is a step of inserting the first rotating tool F from the surface 4a of the auxiliary member 4 and friction stir welding the first butting portion J1.
In the first butting portion friction stirring step, as shown in FIG. 7, the first rotating tool F rotated to the right is inserted into the start position Sp set on the surface Ta of the tab material T, and the back side from the near side in FIG. 7 is inserted. The first rotary tool F is relatively moved along the second metal member 2 toward the side.

In the first embodiment, as shown in FIG. 8, the insertion depth of the first rotating tool F is set so that the stirring pin F <b> 2 contacts the auxiliary member 4, the first metal member 1, and the second metal member 2. ing. That is, only the stirring pin F2 is inserted into the auxiliary member 4, the first metal member 1, and the second metal member 2, and the surface 4a of the auxiliary member 4 and the connecting portion F1 are moved relative to each other while being separated from each other. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed.
Note that the insertion depth of the stirring pin F <b> 2 may be set so as to contact only the first metal member 1. In this case, the periphery of the first abutting portion J1 is plastically fluidized and joined by frictional heat between the stirring pin F2 and the first metal member 1.

Then, when the auxiliary member 4, the first metal member 1 and the second metal member 2 are in contact with the stirring pin F2, the auxiliary member is moved relative to the first abutting portion J1. 4. The first metal member 1 and the second metal member 2 are friction stir welded. In the first embodiment, the stirring pin F <b> 2 is inserted in the center portion (the center portion in the left-right direction) of the surface 4 a of the auxiliary member 4 and the end surface 2 a of the second metal member 2.
A plasticized region W1 is formed on the movement locus of the first rotary tool F. In the first embodiment, the plasticizing region W1 and the plasticizing region W2 are set to overlap each other, but the plasticizing region W1 and the plasticizing region W2 may be separated from each other.

After the first butting portion friction stirring step, as shown in FIG. 9, the auxiliary member 4 is divided by the plasticizing region W1. Further, burrs V and V are formed at the ends of the divided auxiliary members 4 and 4.
The removal step is a step of removing the divided auxiliary members 4 and 4 from the first metal member 1 as shown in FIG. In the removing step, the auxiliary members 4, 4 which are separated by, for example, manual work are bent in a direction away from the surface 1 b of the first metal member 1, and the auxiliary member 4 is removed from the first metal member 1. Further, when the removing step is completed, the tab material T (see FIG. 2) is cut out.

According to the joining method according to the first embodiment described above, as shown in FIG. 8, welding is not performed from the inner corners of the first metal member 1 and the second metal member 2, and friction stir welding is performed from the outer corners. As a result, contamination can be prevented from occurring in the inner corners of the metal members.
Further, in the joining method according to the first embodiment, as shown in FIG. 9, since the friction stir welding is performed from the two directions with respect to the first butting portion J1, water tightness and air tightness can be improved.
Moreover, in the joining method according to the first embodiment, as shown in FIG. 1, by providing the step portion 11, it is possible to prevent the positional deviation between the first metal member 1 and the second metal member 2 in the butting process. it can.
Further, in the joining method according to the first embodiment, as shown in FIGS. 4 and 8, only the stirring pin F2 is inserted, so that the load on the friction stirrer can be reduced.

  In the first embodiment, the first rotating tool F that performs the outer corner friction stirring step and the first rotating tool F that performs the first butting portion friction stirring step are the same rotating tool. Different rotary tools may be used in the outer corner friction stirring process and the first butting part friction stirring process. However, if the same rotating tool is used, there is no need to replace the rotating tool in each process. Efficiency can be increased.

Further, in the joining method according to the first embodiment, as shown in FIG. 8, the first metal member 1 and the second metal member 2 are joined, and in addition to the first metal member 1 and the second metal member 2. Thus, the auxiliary member 4 is also subjected to friction stir welding at the same time, thereby preventing a shortage of metal at the joint. Furthermore, by inserting the stirring pin F <b> 2 into the center portion of the auxiliary member 4, it is possible to more reliably prevent metal shortage at the joint portion.
Further, in the joining method according to the first embodiment, as shown in FIG. 10, since the burr V can be removed from the first metal member 1 together with the auxiliary member 4 in the removing step, there is a step of removing the burr V. It becomes easy.

Although the first embodiment of the present invention has been described above, design changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the outer corner friction stirring step shown in FIG. 3, an auxiliary member is disposed on the end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2, and the stirring pin F2 is inserted from the surface of the auxiliary member. May be.

  Moreover, as shown in FIG. 11, you may perform an outer corner temporary joining process before an outer corner friction stirring process. In the outer corner temporary joining step, the first rotary tool F is inserted from the end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2, and the stirring pin F2 is inserted shallowly to the first abutting portion J1. Temporary joining is performed with spots. A dotted plasticized region W0 is formed in the first butting portion J1.

  Moreover, as shown in FIG. 12, you may perform an inner corner temporary joining process before an outer corner friction stirring process. In the inner corner temporary joining step, the first rotary tool F is inserted from the inner corner formed by the back surface 1c of the first metal member 1 and the first side surface 2b of the second metal member 2, and the stirring pin F2 is inserted shallowly. Then, temporary bonding is performed to the second butting portion J2 with a spot. A point-shaped plasticized region W0 is formed in the second butting portion J2 (inner corner).

  According to the outer corner temporary joining step and the inner corner temporary joining step, the opening of the first metal member 1 and the second metal member 2 can be prevented when the outer corner friction stirring step is performed. Moreover, a joining cycle can be shortened by performing temporary joining with a spot. In addition, you may perform an outer corner temporary joining process by welding, such as MIG welding, TIG welding, or laser welding.

  Further, in addition to the outer corner friction stirring step, the first rotating tool F is inserted from the inner corner formed by the back surface 1c of the first metal member 1 and the first side surface 2b of the second metal member 2, and the stirring pin F2 The inner corner joining process may be performed, in which the friction stir welding is continuously performed to the second butted portion J2 by deeply inserting the.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 14, the joining method according to the second embodiment is different from the first embodiment in that the outer corner friction stirring step is performed after the first butting portion friction stirring step. The joining method according to the second embodiment will be described with a focus on differences from the joining method of the first embodiment.

  In the joining method according to the second embodiment, as shown in FIG. 13, following the tab material arranging step, an auxiliary member arranging step and a first butt portion friction stirring step are performed. In the first butting portion friction stirring step, the first rotating tool F is inserted from the auxiliary member 4 and the first butting portion J1 is friction stir welded.

In the joining method according to the second embodiment, as shown in FIG. 14, the outer corner friction stirring step is performed following the first butting portion friction stirring step and the removing step. In the outer corner friction stirring step, the first rotating tool F is inserted from the outer corner, and the first butted portion J1 is friction stir welded.
According to the joining method according to the second embodiment, contamination can be prevented from occurring in the inner corners of the metal members, and water tightness and air tightness can be improved.

As described above, the second embodiment of the present invention has been described. However, similar to the first embodiment, the design can be changed as appropriate without departing from the spirit of the present invention.
For example, you may perform an outer corner temporary joining process and an inner corner temporary joining process before a 1st butting part friction stirring process.

[Third embodiment]
Next, the joining method according to the third embodiment of the present invention will be described with reference to FIGS. 15 and 16.
The joining method according to the third embodiment is different from the first embodiment in that the second rotating tool G shown in FIG. 15 is used in the outer corner friction stirring step. In the third embodiment, a description will be given focusing on the parts that are different from the first embodiment.

In the outer corner friction stirring step according to the third embodiment, as shown in FIG. 15, the first butting portion J1 is friction stir welded using the second rotating tool G.
The second rotating tool G includes a columnar shoulder portion G1 and a stirring pin G2 that hangs down from the lower end surface G1a of the shoulder portion G1.
Then, the second rotary tool G is inserted into the first butting portion J1 from the end surface 1a of the first metal member 1 and the second side surface 2c of the second metal member 2, and the lower end surface G1a of the shoulder portion G1 is inserted into the first metal member 1. The end surface 1a of the second metal member 2 and the second side surface 2c of the second metal member 2 are moved relative to each other. In this way, the first butted portion J1 is friction stir welded.
As described above, when the first abutting portion J1 is friction stir welded in a state where the shoulder portion G1 of the second rotary tool G is in contact with the metal member, generation of burrs can be suppressed.

The third embodiment of the present invention has been described above. However, similar to the first embodiment, design changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the third embodiment, the first butting portion friction stirring step is performed after the outer corner friction stirring step. However, as shown in FIG. 16, the outer corner friction stirring step is performed after the first butting portion friction stirring step. You may perform a process. In this configuration, after the first butting portion friction stirring step and the removing step are performed to form the plasticized region W1, the first butting portion J1 is friction stir welded using the second rotating tool G in the outer corner friction stirring step. To do.

[Fourth embodiment]
Next, the joining method according to the fourth embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 18, the joining method according to the fourth embodiment is different from the first embodiment in that the stirring pin F <b> 2 is inserted into the end portion of the auxiliary member 4 in the first butting portion friction stirring step. The joining method according to the fourth embodiment will be described with a focus on differences from the joining method of the first embodiment.

  In the first butting portion friction stirring step according to the fourth embodiment, as shown in FIG. 17, a reference line X passing through the end surface 4c of the auxiliary member 4 and orthogonal to the surface 1b of the first metal member 1, and the first rotating tool It arrange | positions so that the rotation center axis | shaft of F may overlap. Moreover, in 4th embodiment, the 1st rotation tool F is moved toward the back | inner side from the near side of FIG. That is, the auxiliary member 4 is arranged on the right side in the traveling direction from the rotation center axis of the first rotary tool F. And the stirring pin F2 is inserted in the edge part of the auxiliary member 4. As shown in FIG.

  In the first rotating tool F of the fourth embodiment, the spiral groove is formed clockwise as it goes from the proximal end to the distal end of the stirring pin F2. In the fourth embodiment, since the first rotating tool F is rotated to the left, the left side of the traveling direction of the first rotating tool F is the retreating side: the moving speed of the rotating tool from the tangential speed on the outer periphery of the rotating tool. Is the subtracted side). On the other hand, the right side of the traveling direction of the first rotating tool F is a shear side (advancing side: the side on which the moving speed of the rotating tool is added to the tangential speed on the outer periphery of the rotating tool).

When the rotation speed of the first rotating tool F is slow, the temperature of the shear fluid side is more likely to rise on the shear side than on the flow side, so that the shear side (the first rotating tool F outside the plasticizing region W1). Burrs V tend to be generated on the right side of the traveling direction).
On the other hand, when the rotation speed of the first rotating tool F is high, the temperature of the plastic fluidized material increases on the shear side compared to the flow side, but the flow side outside the plasticizing region W1 (the rotation speed is faster). Many burrs V tend to be generated on the left side of the traveling direction of the first rotating tool F).

  In the fourth embodiment, the moving direction and the rotating direction of the first rotating tool F are set so that the shear side of the first rotating tool F is on the auxiliary member 4 side (the right side in the traveling direction of the first rotating tool F). . The rotation direction and the traveling direction of the first rotating tool F are not limited and may be set as appropriate.

In the fourth embodiment, since the rotation speed of the first rotary tool F is set to be slow, there is a tendency that many burrs V are generated on the shear side outside the plasticizing region W1. That is, the burrs V can be concentrated on the auxiliary member 4 side (see FIG. 19).
As described above, in the first abutting portion friction stirring step, which side of the traveling direction of the first rotary tool F the burr V is generated varies depending on the joining conditions.
The joining conditions include the rotation speed, rotation direction, movement direction, movement speed (feed speed) of the first rotary tool F, the inclination angle of the stirring pin F2, the first metal member 1, the second metal member 2, and the auxiliary member 4. It is determined by each element such as the material and the thickness of each member and the combination of these elements.
If the auxiliary member 4 is arranged on the side where the burrs V are generated or on the side where many burrs V are generated according to the joining conditions, the step of removing the burrs V can be easily performed.

The fourth embodiment of the present invention has been described above. However, as in the first embodiment, design changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the fourth embodiment, the first butting portion friction stirring step is performed after the outer corner friction stirring step, but the outer corner friction stirring step may be performed after the first butting portion friction stirring step.

[Fifth embodiment]
Next, the joining method according to the fifth embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 21, the joining method according to the fifth embodiment is the fourth embodiment in that the stirring pin F2 is inserted slightly closer to the center side than the end of the auxiliary member 4 in the first butting portion friction stirring step. It differs from the form. The joining method according to the fifth embodiment will be described with a focus on differences from the joining method according to the fourth embodiment.

  In the first butting portion friction agitation process of the fifth embodiment, as shown in FIGS. 20 and 21, after the friction agitation, the auxiliary member 4 remains only on one side of the first rotary tool F. The rotation center axis of the one-rotation tool F is shifted slightly to the center side (right side) of the auxiliary member 4 with respect to the reference line X. In the fifth embodiment, the first rotary tool F is moved from the near side to the far side in FIG. That is, about 90% of the auxiliary member 4 is arranged on the right side in the traveling direction with respect to the rotation center axis of the first rotating tool F, and the remaining auxiliary member 4 is on the left side in the moving direction with respect to the rotation center axis of the first rotating tool F. About 10% of these are arranged. And the stirring pin F2 is inserted in the edge part of the auxiliary member 4. As shown in FIG.

  In the first rotating tool F of the fifth embodiment, the spiral groove is formed clockwise as it goes from the proximal end of the stirring pin F2 to the distal end. Further, the first rotating tool F is rotated counterclockwise. Therefore, the left side of the traveling direction of the first rotating tool F is the flow side, and the right side of the traveling direction of the first rotating tool F is the shear side.

  In the fifth embodiment, the moving direction and the rotating direction of the first rotating tool F are set so that the shear side of the first rotating tool F becomes the auxiliary member 4 side. Therefore, as shown in FIG. 22, since the burrs V can be concentrated on the auxiliary member 4 side, the step of removing the burrs V can be easily performed.

  The fifth embodiment of the present invention has been described above. However, similar to the fourth embodiment, design changes can be made as appropriate without departing from the spirit of the present invention.

[Sixth embodiment]
Next, the joining method according to the sixth embodiment of the present invention will be described in detail with reference to FIG.
In the joining method according to the sixth embodiment, as shown in FIG. 23, in the first abutting portion friction stirring step, the stirring pin F2 is inserted closer to the first side surface 2b than the central portion of the end surface 2a of the second metal member 2. This is different from the fourth embodiment. The joining method according to the sixth embodiment will be described with a focus on differences from the joining method of the fourth embodiment.

In the first butting portion friction stirring step of the sixth embodiment, as shown in FIG. 23, the rotation center axis of the first rotating tool F is from the center portion (the center portion in the left-right direction) of the end surface 2 a of the second metal member 2. Is also shifted to the first side surface 2b side (right side). Further, the rotation center axis of the first rotary tool F passes through the second butting portion J2. Furthermore, the insertion depth of the first rotating tool F is set so that the stirring pin F2 reaches the second butting portion J2.
In the first butt portion friction stirring step of the sixth embodiment, the first butt portion J1 and the second butt portion J2 can be friction stir welded, so that the water tightness and air tightness of the joint portion can be improved.

The sixth embodiment of the present invention has been described above. However, similar to the fourth embodiment, design changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the sixth embodiment, the rotation center axis of the first rotation tool F passes through the second abutting portion J2, but the rotation center axis of the first rotation tool F is set to the second side surface 2c rather than the second abutting portion J2. It may be arranged on the side (left side).

1 1st metal member 1a end surface 1b surface 1c back surface 1d side surface 2 second metal member 2a end surface 2b first side surface 2c second side surface 4 auxiliary member 4a surface 4b back surface 4c end surface 11 step portion 11a step bottom surface 11b step side surface F first rotation Tool F1 connecting portion F2 stirring pin G second rotating tool G1 shoulder portion G2 stirring pin J1 first abutting portion J2 second abutting portion W1 plasticizing region W2 plasticizing region

Claims (13)

While preparing a plate-like first metal member having a stepped portion formed on the back surface of the end portion, a preparation step of preparing a plate-like second metal member;
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form a first abutting portion, the step side surface of the step portion, and the first side of the second metal member A butting step of butting the side surfaces to form a second butting portion;
The stirring pin of the rotary tool is inserted from the end surface of the first metal member and the second side surface of the second metal member, and the rotary tool is relatively moved along the first abutting portion. Outer corner friction stirring process for friction stir welding;
An auxiliary member arranging step of arranging an auxiliary member so as to be in surface contact with the surface of the first metal member along the first abutting portion;
A first abutting portion friction stirring step of inserting the stirring pin from the surface side of the auxiliary member, relatively moving the rotary tool along the first abutting portion, and friction stir welding the first abutting portion; Including
In the first butting portion friction stirring step, only the stirring pin is in contact with the first metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member, A joining method comprising: friction stir welding of one butted portion.   The joining method according to claim 1, further comprising a removing step of removing the auxiliary member formed with burrs from the first metal member.   The joining method according to claim 2, wherein in the first butting portion friction stirring step, the stirring pin is inserted into a central portion of the auxiliary member. When the reference line is a line that passes through the end face of the auxiliary member and is orthogonal to the surface of the first metal member,
In the first butting portion friction stirring step, the rotating tool is relatively moved so that the rotation center axis of the rotating tool and the reference line overlap with each other, and a burr generated by friction stir welding is formed on the auxiliary member. The joining method according to claim 2, wherein joining conditions are set so that the joining conditions are satisfied. When the reference line is a line that passes through the end face of the auxiliary member and is orthogonal to the surface of the first metal member,
In the first butting portion friction agitation step, after the friction agitation is performed, the rotation center axis of the rotary tool is slightly more than the reference line so that the auxiliary member remains only on one side of the rotary tool. The joining method according to claim 2, wherein the joining condition is set so that burrs are formed on the remaining auxiliary member while the rotational tool is displaced relative to the center side of the member to relatively move the rotating tool. .   2. The friction stir welding of the first butting portion is performed in the outer corner friction stirring step in a state where only the stirring pin is in contact with the first metal member and the second metal member. The joining method according to claim 5. While preparing a plate-like first metal member having a stepped portion formed on the back surface of the end portion, a preparation step of preparing a plate-like second metal member;
The step bottom surface of the step portion of the first metal member and the end surface of the second metal member are abutted to form a first abutting portion, the step side surface of the step portion, and the first side of the second metal member A butting step of butting the side surfaces to form a second butting portion;
The stirring pin of the second rotary tool having a shoulder portion and a stirring pin is inserted from the end surface of the first metal member and the second side surface of the second metal member, and the shoulder portion is inserted into the first metal member and the first metal member. An outer corner friction agitation step of frictionally agitating and joining the first abutting portion by moving the second rotary tool relative to the first abutting portion while being in contact with two metal members;
An auxiliary member arranging step of arranging an auxiliary member so as to be in surface contact with the surface of the first metal member along the first abutting portion;
A first abutting is performed in which a stirring pin of a first rotating tool is inserted from the surface side of the auxiliary member, the first rotating tool is relatively moved along the first abutting portion, and the first abutting portion is friction stir welded. Part friction stirring step,
In the first butting portion friction stirring step, only the stirring pin of the first rotating tool is brought into contact with the first metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member. In this state, the first abutting portion is friction stir welded.   The joining method according to claim 7, further comprising a removing step of removing the auxiliary member formed with burrs from the first metal member.   The joining method according to claim 8, wherein in the first butting portion friction stirring step, the stirring pin of the first rotating tool is inserted into a central portion of the auxiliary member. When the reference line is a line that passes through the end face of the auxiliary member and is orthogonal to the surface of the first metal member,
In the first butting portion friction stirring step, the first rotary tool is relatively moved so that the rotation center axis of the first rotary tool and the reference line overlap with each other, and burrs generated in friction stir welding are the auxiliary The joining method according to claim 8, wherein joining conditions are set so as to be formed on the member. When the reference line is a line that passes through the end face of the auxiliary member and is orthogonal to the surface of the first metal member,
In the first butting portion friction stirring step, after the friction stirring is performed, the rotation center axis of the first rotating tool is made more than the reference line so that the auxiliary member remains only on one side of the first rotating tool. The joining condition is set so that the first rotating tool is relatively displaced by being slightly shifted toward the center side of the auxiliary member, and a burr is formed on the remaining auxiliary member. 9. The joining method according to 8.   Before performing the outer corner friction stirring step or the first butting portion friction stirring step, a temporary spot is applied to the first butting portion from the end surface of the first metal member and the second side surface of the second metal member. The joining method according to any one of claims 1 to 11, further comprising a provisional joining step for outer corners.   Before performing the outer corner friction stirring step or the first butt portion friction stirring step, the second butt portion from the inner corner formed by the back surface of the first metal member and the first side surface of the second metal member. The joining method as described in any one of Claims 1-12 including the inner-corner temporary joining process which performs spot tacking with respect to.

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