WO2016181770A1

WO2016181770A1 - Joining method

Info

Publication number: WO2016181770A1
Application number: PCT/JP2016/062387
Authority: WO
Inventors: 堀　久司; 伸城瀬尾
Original assignee: 日本軽金属株式会社
Priority date: 2015-05-14
Filing date: 2016-04-19
Publication date: 2016-11-17
Also published as: JP6414327B2; JPWO2016181770A1; CN107530826A

Abstract

Provided is a joining method by which it is possible, during friction stir welding, to prevent metal members shifting out of position and the metal members from separating, and by which deformation of metal members can be corrected. The method is characterized by including: a butting step for butting the rear surface (1a) of a first metal member (1) and an end surface of a second metal member (2); a welding step for carrying out welding of inside corners which are formed by the rear surface (1a) of the first metal member (1) and side surfaces (2a, 2b) of the second metal member (2); and a friction stirring step for inserting a stirring pin (G2) of a rotary tool (G) from the first metal member (1) front surface (1b) side, moving the rotary tool (G) along a butted part (J), and carrying out friction stir welding on the butted part (J) in a state in which the stirring pin (G2) contacts the first metal member (1) only, or both the first metal member (1) and the second metal member (2); in the friction stirring step, friction stir welding of the butted part (J) takes place while a shoulder part (G1) of the rotary tool (G) is pressed against the front surface (1b) of the first metal member (1).

Description

Joining method

The present invention relates to a joining method in which metal members are friction stir welded together.

Patent Documents

1 and 2 disclose a technique in which metal members are butted in a T shape when viewed from the front, and the butted portion is friction stir welded. In the related art, after inserting the end portion of the second metal member into the concave groove formed on the back surface of the first metal member, the rotating tool is inserted from the front surface side of the first metal member to friction stir the butt portion. It is to join.

Patent Document 3 discloses a joining method in which a first metal member and a second metal member are overlapped and welded to an inner corner formed by a surface of the first metal member and an end surface of the second metal member. It is disclosed.

Japanese Patent No. 3947271 Japanese Patent No. 4056587 Japanese Patent Laid-Open No. 2002-144064

In the techniques according to

Patent Documents

1 and 2, since the second metal member is inserted into the groove of the first metal member, the positions of the metal members are shifted in the longitudinal direction of the second metal member during friction stir welding. There's a problem. Further, if the first metal member is separated so as to be lifted with respect to the second metal member during the friction stir welding, there is a risk of causing a bonding defect. Further, in the prior art, the surface side of the first metal member (the surface side on which the rotary tool is inserted) becomes concave due to the frictional heat during friction stir welding (the tip side of the first metal member is the second metal member) There is a risk of deformation.

Further, in the technique according to Patent Document 3, since the strength of the welded portion is low, the first metal member and the second metal member may be separated.

From such a point of view, the present invention provides a joining method capable of preventing the positions of the metal members from shifting and separating the metal members during friction stir welding, and further correcting the deformation of the metal members. The issue is to provide. Moreover, this invention makes it a subject to provide the joining method with high joining strength.

In order to solve such a problem, the present invention provides a butting step of butting the back surface of the plate-like first metal member and the end surface of the plate-like second metal member to form a butting portion, and the first metal member A welding process for welding the inner corner formed by the back surface of the second metal member and the side surface of the second metal member, and the rotating tool from the surface side opposite to the back surface of the first metal member to the first metal member The stirring pin is inserted, and the rotary tool is moved along the abutting portion so that the stirring pin contacts only the first metal member or both the first metal member and the second metal member. A friction stir welding step for friction stir welding the butt portion in a state where the butt portion is friction stir welded while the shoulder portion of the rotary tool is pushed into the surface of the first metal member in the friction stirring step. It is characterized by that.

According to this joining method, since the welding process is performed, it is possible to prevent displacement and separation of metal members during the friction stirring process. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of a metal member can be prevented. Moreover, although it deform | transforms so that the back surface side of a 1st metal member may become concave by the welding heat at the time of welding, the said deformation | transformation can be corrected with the frictional heat at the time of friction stir welding. Further, since the shoulder portion of the rotary tool is pushed into the metal member, the generation of burrs can be reduced. In addition, since the recessed groove | channel of a plasticization area | region will become shallow if the amount of pushing of a shoulder part is made small, the surface of a 1st metal member can be finished finely.

The present invention also includes a butting step of butting the back surface of the plate-shaped first metal member and the end surface of the plate-shaped second metal member to form a butting portion, the back surface of the first metal member, and the second metal A welding step of performing welding on the inner corner formed by the side surface of the member, and inserting a stirring pin of the rotary tool into the first metal member from the surface side opposite to the back surface of the first metal member, The abutting portion is moved in a state where the rotating tool is moved along the abutting portion and only the stirring pin is brought into contact with only the first metal member or both the first metal member and the second metal member. And a friction stirring step of friction stir welding.

According to such a joining method, since the welding process is performed, it is possible to prevent displacement and separation of the metal members during the friction stirring process. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of a metal member can be prevented. Moreover, although it deform | transforms so that the back surface side of a 1st metal member may become concave by the welding heat at the time of welding, the said deformation | transformation can be corrected with the frictional heat at the time of friction stir welding. Moreover, since only the stirring pin of the rotary tool is in contact with the metal member, the width of the plasticizing region can be reduced. If the width of the plasticized region can be reduced, it is advantageous when the thickness of the second metal member is small. In addition, by bringing only the stirring pin of the rotary tool into contact with the metal member, friction stirring can be performed to a deep position without applying a large load to the friction stirring device, which is advantageous when the plate thickness of the first metal member is large.

In addition, the present invention forms a first abutting portion by abutting the end surface of the plate-shaped first metal member and the end surface of the plate-shaped third metal member, and the back surface of the first metal member and the third metal member. Welding to the inner corner formed by the butting step of forming the second butting portion by butting the back surface of the metal member and the end surface of the second metal member, and the back surface of the first metal member and the side surface of the second metal member A welding step of welding the inner corner formed by the back surface of the third metal member and the side surface of the second metal member, the surface side opposite to the back surface of the first metal member, and the A stirring pin of a rotating tool is inserted into the first abutting portion from the surface side opposite to the back surface of the third metal member, the rotating tool is moved along the first abutting portion, and the agitating pin is moved to the first abutting portion. Only one metal member and the third metal member, or the first metal member A friction stir step for friction stir welding the first butted portion and the second butted portion in a state where they are in contact with all of the genus member, the second metal member, and the third metal member, and in the friction stir step, The first butting portion and the second butting portion are friction stir welded while pushing the shoulder portion of the rotating tool into the surface of the first metal member and the surface of the third metal member.

According to such a joining method, since the welding process is performed, it is possible to prevent displacement and separation of the metal members during the friction stirring process. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of a metal member can be prevented. Moreover, although it deform | transforms so that the back surface side of a 1st metal member and a 3rd metal member may become concave by the welding heat at the time of welding, the said deformation | transformation can be corrected with the frictional heat at the time of friction stir welding. Further, since the shoulder portion of the rotary tool is pushed into the metal member, the generation of burrs can be reduced. In addition, since the recessed groove of a plasticization area | region becomes shallow by making the pushing amount of a shoulder part small, the surface of a 1st metal member and a 3rd metal member can be finished finely.

Further, the present invention forms a first abutting portion by abutting the end face of the plate-like first metal member with the end face of the plate-like third metal member, and the back surface of the first metal member and the third metal Welding is performed on the inner corner formed by the butting step of forming the second butting portion by butting the back surface of the member and the end surface of the second metal member, and the back surface of the first metal member and the side surface of the second metal member. And applying a welding process to an inner corner formed by a back surface of the third metal member and a side surface of the second metal member, a surface side opposite to the back surface of the first metal member, and the first A stirring pin of a rotating tool is inserted into the first abutting portion from the surface side opposite to the back surface of the three metal members, the rotating tool is moved along the first abutting portion, and only the agitating pin is moved to the first abutting portion. Only one metal member and the third metal member, or Metal member, characterized in that it comprises a friction stir process of friction stir welding said first abutting portion and the second abutting section being in contact with all of the second metal member, and a third metal member.

According to such a joining method, since the welding process is performed, it is possible to prevent displacement and separation of the metal members during the friction stirring process. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of a metal member can be prevented. Moreover, although it deform | transforms so that the back surface side of a 1st metal member and a 3rd metal member may become concave by the welding heat at the time of welding, the said deformation | transformation can be corrected with the frictional heat at the time of friction stir welding. Moreover, since only the stirring pin of the rotary tool is in contact with the metal member, the width of the plasticizing region can be reduced. If the width of the plasticized region can be reduced, it is advantageous when the thickness of the second metal member is small. Further, since the friction stirrer can frictionally stir up to a deep position without applying a large load to the friction stirrer, it is advantageous when the plate thickness of the first metal member and the third metal member is large.

In the welding process, it is preferable to perform overlay welding continuously in one pass at the inner corner. In the welding process, it is preferable to intermittently build up the inner corner with a gap. In the welding process, it is preferable to perform laser welding, MIG welding, or TIG welding. What is necessary is just to supply a filler material suitably as needed. According to this joining method, the inner corner can be reliably joined.

In the friction stirring step, it is preferable that a pair of mounts are disposed on both sides of the second metal member, and a chamfered portion is formed in a portion of the mount that faces the inner corner.

According to such a joining method, it is possible to avoid contact between the weld metal formed at the inner corner and the gantry, and therefore, the metal member can be suitably disposed on the gantry.

In addition, the present invention provides an overlapping process in which the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member are overlapped to form an overlapped portion, the end surface of the first metal member, and the first A welding step of welding an inner corner formed by the back surface of the two metal member and welding an inner corner formed by the surface of the first metal member and the end surface of the second metal member, and a stirring pin and a shoulder portion A rotating tool including the second metal member is inserted from the surface side opposite to the back surface of the second metal member, and the stirring pin is only the second metal member or both the first metal member and the second metal member A first main joining step in which the rotating tool is relatively moved along the superposed portion in a state of contact with the superposed portion to friction stir weld the superposed portion. In the first main joining step, the rotation The shoulder of the tool is placed on the surface of the second metal member. And performing friction stir welding while pushing.

According to such a method, since welding and friction stir welding are performed on the overlapped portion, the bonding strength of the overlapped portion can be increased. Moreover, the position shift of the 1st metal member and the 2nd metal member at the time of a 1st main joining process can be prevented by performing a welding process. Moreover, generation | occurrence | production of a burr | flash can be suppressed by pushing a shoulder part in a 2nd metal member.

In addition, the present invention provides an overlapping process in which the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member are overlapped to form an overlapped portion, the end surface of the first metal member, and the first A welding step of welding an inner corner formed by the back surface of the two metal member and welding an inner corner formed by the surface of the first metal member and the end surface of the second metal member; and a stirring pin Insert the rotary tool from the front side opposite to the back side of the second metal member, and contact only the stirring pin with only the second metal member or both the first metal member and the second metal member And a first main joining step in which the rotating tool is relatively moved along the overlapped portion in a state of being caused to friction stir weld the overlapped portion.

According to such a method, according to such a method, since welding and friction stir welding are performed on the overlapped portion, the bonding strength of the overlapped portion can be increased. Moreover, the position shift of the 1st metal member and the 2nd metal member at the time of a 1st main joining process can be prevented by performing a welding process. Further, by performing only the first main joining step by bringing only the stirring pin of the rotary tool into contact, friction stirring can be performed to a deep position without applying a large load to the friction stirring device.

Further, a rotary tool having a stirring pin and a shoulder portion is inserted from the back side opposite to the surface of the first metal member, and the stirring pin of the rotary tool is only the first metal member or the first metal. A second main joining step of friction stir welding the superposed part by relatively moving the rotary tool along the superposed part in a state of being in contact with both the member and the second metal member, In the second main joining step, friction stir is performed while pushing the shoulder portion of the rotary tool into the back surface of the first metal member, and the plasticizing region of the first main joining step and the second main joining step are performed. It is preferable to overlap the plasticized region.
Further, a rotary tool provided with a stirring pin is inserted from the back side opposite to the surface of the first metal member, and only the first metal member or the first metal member and the stirring pin of the rotary tool are inserted. And a second main joining step of friction stir welding the superposed part by relatively moving the rotary tool along the superposed part in a state of being in contact with both of the second metal members. In the joining step, it is preferable that the plasticizing region in the first main joining step overlaps the plasticizing region in the second main joining step.

According to such a method, since the friction stir is performed also from the back surface side of the first metal member, the bonding strength can be further increased and the bonding can be performed in a balanced manner.

In addition, the present invention provides an overlapping process in which the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member are overlapped to form an overlapped portion, the end surface of the first metal member, and the first A welding step of welding an inner corner formed by the back surface of the two metal member and welding an inner corner formed by the surface of the first metal member and the end surface of the second metal member; and a pair of shoulder portions And a stirrer pin that connects between the shoulder portions, and a main joining step of relatively moving a bobbin rotating tool along the superposed portion to friction stir weld the superposed portion, and in the main joining step, Friction stirring is performed in a state where the shoulder portion is in contact with each of the first metal member and the second metal member.

According to such a method, since welding and friction stir welding are performed on the overlapped portion, the bonding strength of the overlapped portion can be increased. Moreover, the position shift of the 1st metal member and the 2nd metal member at the time of this joining process can be prevented by performing a welding process. Moreover, the whole joining process of the 1st metal member and the 2nd metal member can be joined by 1 pass by performing this joining process using a bobbin rotation tool.

According to the joining method according to the present invention, it is possible to prevent displacement of metal members and separation of metal members during friction stir welding. Moreover, according to the joining method which concerns on this invention, a deformation | transformation of a metal member can be corrected. Moreover, according to the joining method which concerns on this invention, joining strength can be raised.

It is a perspective view which shows the joining method which concerns on 1st embodiment of this invention, (a) shows a butt | matching process, (b) shows a welding process. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 1st embodiment, (a) shows before joining, (b) shows during joining. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 2nd embodiment of this invention. It is a figure which shows the joining method which concerns on 3rd embodiment of this invention, (a) is a perspective view which shows a welding process, (b) is sectional drawing which shows a friction stirring process. It is a perspective view which shows the joining method which concerns on 4th embodiment of this invention, (a) shows a butt | matching process, (b) shows a welding process. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 4th embodiment, (a) shows before joining, (b) shows during joining. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 5th embodiment, (a) shows before joining, (b) shows during joining. It is a perspective view which shows the joining method which concerns on 6th embodiment, Comprising: (a) is a welding process, (b) shows a tab material joining process. It is a figure which shows the 1st main joining process of the joining method which concerns on 6th embodiment, Comprising: (a) is a perspective view, (b) is sectional drawing. It is sectional drawing which shows the 2nd main joining process of the joining method which concerns on 6th embodiment. It is a figure which shows the 1st main joining process of the joining method which concerns on 7th embodiment, Comprising: (a) is a perspective view, (b) is sectional drawing. It is sectional drawing which shows the 2nd main joining process of the joining method which concerns on 7th embodiment. It is a perspective view which shows the bobbin tool of the joining method which concerns on 8th embodiment. It is a figure which shows this joining process of the joining method which concerns on 8th embodiment, (a) is a perspective view, (b) is sectional drawing.

[First embodiment]
A joining method according to a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1A, in the joining method according to the present embodiment, the first metal member 1 and the second metal member 2 are butted in a T shape in front view and joined by friction stirring.

The first metal member 1 and the second metal member 2 both have a plate shape. Although the plate | board thickness of the 1st metal member 1 and the 2nd metal member 2 may be formed so that it may differ, in this embodiment, it is the same. 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.

In the joining method according to the present embodiment, a butt process, a welding process, and a friction stirring process are performed. The abutting step is a step of forming a butting portion J by abutting the back surface 1a of the first metal member 1 and the end surface 2c of the second metal member 2 as shown in FIG.

The welding process is a process of welding and joining the inner corners as shown in FIG. The welding process includes a first inner corner formed by the back surface 1 a of the first metal member 1 and the first side surface 2 a of the second metal member 2, the back surface 1 a of the first metal member 1, and the second metal member 2. The second inner corner formed by the two side surfaces 2b is welded. The type of welding is not particularly limited, but in the welding process according to the present embodiment,

weld metals

3 and 3 are formed by performing overlay welding such as laser welding, TIG welding, or MIG welding. What is necessary is just to supply a filler material suitably as needed. The welding process may be performed continuously in one pass without any gap as in this embodiment, or may be performed intermittently so that the weld metal 3 with respect to one inner corner is formed. Also good. After the welding process, as shown in FIG. 1B, the back surface 1a side of the first metal member 1 becomes concave due to thermal contraction (the front end side of the first metal member 1 is close to the second metal member 2). Like) warping and deforming. In addition, although a welding process should just be performed to at least one of a 1st inner corner and a 2nd inner corner, it can join with sufficient balance by welding to both.

The friction stir step is a step of performing friction stir welding to the butt joint J as shown in FIGS. As shown to (a) of FIG. 2, in a friction stirring process, the 1st metal member 1 and the 2nd metal member 2 are first arrange | positioned to the

mount frame

4 and 4. FIG. More specifically, in the friction stirring step, the second metal member 2 is inserted between the

gantry

4 and 4 that are spaced apart, and the back surface 1 a of the first metal member 1 is brought into contact with the

gantry

4 and 4. Each of the

mounts

4 and 4 has a rectangular parallelepiped shape.

Chamfered portions

4 a and 4 a are formed at portions of the

gantry

4 and 4 that face each inner corner. The shape of the chamfered portion 4a may be appropriately formed so as not to come into contact with the weld metal 3, and is a C chamfered shape in the present embodiment.

Next, as shown in FIG. 2 (b), the rotary tool F is inserted from the surface 1 b of the first metal member 1, and friction stir welding is performed along the abutting portion J. The rotary tool F includes a connecting portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting part F1 is a part connected to a rotating shaft of a friction stirrer (not shown). The connecting portion F1 has a columnar shape and is formed with a screw hole to which a bolt is fastened.

The stirring pin F2 hangs down from the connecting part F1, and is coaxial with the connecting part F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. The length of the stirring pin F <b> 2 is larger than the plate thickness of the first metal member 1. A spiral groove F3 is formed on the outer peripheral surface of the stirring pin F2. In the present embodiment, in order to rotate the rotary tool F to the right, the spiral groove F3 is formed counterclockwise from the base end toward the tip. In other words, the spiral groove F3 is formed counterclockwise as viewed from above when the spiral groove F3 is traced from the base end to the tip.

In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove F3 clockwise as it goes from the proximal end to the distal end. In other words, the spiral groove F3 in this case is formed clockwise when viewed from above when the spiral groove F3 is traced from the proximal end to the distal end. By setting the spiral groove F3 in this way, the plastic fluidized metal at the time of frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove F3. Thereby, the amount of metal overflowing to the outside of the first metal member 1 can be reduced.

As shown in FIG. 2B, when the friction stir welding is performed using the rotary tool F, only the rotated stirring pin F2 is inserted into the first metal member 1, and the first metal member 1 and the connecting portion are inserted. It is moved away from F1. In other words, the friction stir welding is performed by tracing the butted portion J with the base end portion of the stirring pin F2 exposed. A plasticized region W is formed in the movement locus of the rotary tool F by hardening of the friction-stirred metal.

The insertion depth of the rotary tool F is preferably set so that the tip of the stirring pin F2 reaches the butt J. That is, it is preferable to perform friction stir welding by bringing the rotary tool F into contact with the first metal member 1 and the second metal member 2. When setting so that the tip of the agitation pin F2 does not reach the butting portion J, that is, when the agitation pin F2 is brought into contact only with the first metal member 1, the frictional heat between the first metal member 1 and the agitation pin F2 As a result, the metal around the butted portion J is plastically fluidized so that the first metal member 1 and the second metal member 2 are joined.

In addition, after the friction stirring process is completed, it is preferable to perform a burr removing process for removing burrs generated on the surface 1b of the first metal member 1. Thereby, the surface 1b of the 1st metal member 1 can be finished finely.

According to the joining method according to the present embodiment described above, since welding is performed on the inner corner, it is possible to prevent displacement and separation between the first metal member 1 and the second metal member 2 during the friction stirring step. it can. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of the 1st metal member 1 and the 2nd metal member 2 can be prevented. Moreover, although it deform | transforms so that the back surface 1a side of the 1st metal member 1 may become concave by the welding heat at the time of welding, the said deformation | transformation can be corrected with the frictional heat at the time of friction stir welding.

Also, the type of welding in the welding process is not particularly limited, but the inner corner can be easily and reliably welded by performing laser welding, TIG welding, or MIG welding as in the present embodiment.

Further, the

mounts

4 and 4 of the present embodiment have chamfered

portions

4a and 4a formed at portions facing the inner corners. When the first metal member 1 and the second metal member 2 are arranged on the gantry 4, the weld metal 3 and the gantry 4 interfere with each other, and the first metal member 1 and the second metal member 2 may be lifted from the gantry 4. However, according to this embodiment, it is possible to prevent the

weld metals

3 and 3 and the gantry 4 from interfering with each other.

Moreover, in the friction stirring process of this embodiment, using the rotary tool F, friction is performed with only the stirring pin F2 in contact with the first metal member 1 and the second metal member 2 (or only the first metal member 1). Since the stir welding is performed, the friction stir welding can be performed to a deep position in a state where a large load is not applied to the friction stirrer. Therefore, the rotary tool F is particularly advantageous when the thickness of the first metal member 1 is large. Moreover, since the rotation tool F can make the width | variety of the plasticization area | region W small compared with the case where a shoulder part is pushed in, it is advantageous also when the plate | board thickness of the 2nd metal member 2 is thin.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. As shown in FIG. 3, the joining method according to the second embodiment is different from the first embodiment in that a rotating tool G is used. In the joining method according to the second embodiment, a butt process, a welding process, and a friction stirring process are performed. Since the butting process and the welding process are the same as those in the first embodiment, the description thereof is omitted.

Rotating tool G is composed of a shoulder part G1 and a stirring pin G2 depending from the shoulder part G1. A spiral groove is formed on the outer peripheral surface of the stirring pin G2. In the friction stirring step, the rotary tool G is moved along the abutting portion J while being inserted into the surface 1 b of the first metal member 1. In the friction stirring step, the lower end surface of the shoulder portion G1 is pushed into the first metal member 1 by about several millimeters to perform friction stirring. The insertion depth of the stirring pin G2 is not particularly limited as long as the abutting portion J can be friction stir welded, but is preferably set so that the tip of the agitating pin G2 reaches the abutting portion J as in this embodiment. That is, it is preferable to perform friction stir welding by bringing the rotary tool G into contact with the first metal member 1 and the second metal member 2.

When setting so that the tip of the stirring pin G2 does not reach the butting portion J, that is, when the stirring pin G2 contacts only the first metal member 1, the frictional heat between the first metal member 1 and the stirring pin G2 As a result, the metal around the butted portion J is plastically fluidized so that the first metal member 1 and the second metal member 2 are joined.

According to the joining method according to the second embodiment described above, substantially the same effect as that of the first embodiment can be obtained. Moreover, since the shoulder part G1 is pushed into the surface 1b of the first metal member 1, the plastic fluidized material is pressed by the shoulder part G1, and burrs can be reduced. Further, when the pressing amount of the rotary tool G is reduced, the concave groove generated on the surface 1b by the plasticizing region W can be reduced, so that the surface treatment or the like is facilitated and the surface 1b of the first metal member 1 is cleaned. Can be finished.

[Third embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. As shown in FIGS. 4A and 4B, the joining method according to the third embodiment is different from the first embodiment in that the thickness of the first metal member 1A and the rotary tool G are used. The first metal member 1A has a thickness of about 1/3 compared to the first embodiment. Therefore, in the welding process, as compared with the first embodiment, the back surface 1a of the first metal member 1A becomes concave due to thermal contraction (so that the front end side of the first metal member 1A is close to the second metal member 2). Deforms greatly.

The friction stirring step is the same as the friction stirring step according to the second embodiment. That is, in the friction stirring step, the rotary tool G is inserted from the surface 1b of the first metal member 1A, and the rotary tool G is moved along the abutting portion J.

Even with the joining method according to the third embodiment described above, substantially the same effect as that of the first embodiment can be obtained. In particular, when the plate thickness of the first metal member 1A is thin and the deformation in the welding process is large as in the present embodiment, the first metal member 1A is greatly deformed. In such a case, the amount of heat input is increased by performing friction stir welding while bringing the shoulder G1 into contact with the first metal member 1A using the rotary tool G, so that it is possible to correct the warp generated in the welding process. it can. Thereby, the curvature which generate | occur | produced in 1 A of 1st metal members can be corrected, and 1 A of 1st metal members can be made flat. In the friction stirring process, the outer diameter of the shoulder portion G1, the feed speed of the rotating tool G, or the rotational speed of the rotating tool G is appropriately set to control the heat input. After the friction stirring process, the first metal member 1A (1 ) Is preferably flat.

[Fourth embodiment]
Next, the joining method according to the fourth embodiment of the present invention will be described. As shown in FIGS. 5A and 5B, in the joining method according to the fourth embodiment, the first metal member 21, the second metal member 22, and the third metal member 23 are butted in a T-shape when viewed from the front. This is different from the first embodiment in that it is joined.

In the joining method according to the fourth embodiment, a butt process, a welding process, and a friction stirring process are performed. In the butting step, the end surface 21c of the first metal member 21 and the end surface 23c of the third metal member 23 are butted to form the first butting portion J1. In the butting process, the end face 22c of the second metal member 22 is butted against the butting part J1 to form the second butting part J2. That is, the end surface 22 c of the second metal member 22 is abutted against the back surface 21 a of the first metal member 21 and the back surface 23 a of the third metal member 23.

The welding step is a step of welding the first inner corner between the back surface 21a of the first metal member 21 and the first side surface 22a of the second metal member 22 as shown in FIG. The welding process is a process of welding the second inner corner between the back surface 23 a of the third metal member 23 and the second side surface 22 b of the second metal member 22. When the welding process is completed, the distal ends of the first metal member 21 and the third metal member 23 are deformed into a concave shape along the direction approaching the second metal member 22 due to thermal contraction.

The friction stirring step is a step of friction stir welding the first butting portion J1 and the second butting portion J2 using the rotary tool G as shown in FIGS. 6 (a) and 6 (b). In the friction stirring step, first, the first metal member 21, the second metal member 22, and the third metal member 23 joined to the

mounts

4 and 4 with the

weld metals

3 and 3 are arranged in the same manner as in the first embodiment.

Next, the rotating stirring pin G2 is inserted into the first butting portion J1, and the rotating tool G is relatively moved along the first butting portion J1. A plasticized region W is formed in the movement locus of the rotary tool G. In the friction stirring step, the lower end surface of the shoulder portion G1 is pushed into the surface 21b of the first metal member 21 and the surface 23b of the third metal member 23 by about several millimeters to perform friction stirring. The insertion depth of the stirring pin G2 is preferably set so that the tip of the stirring pin G2 reaches the second butting portion J2. That is, it is preferable to perform the friction stir welding in a state where the stirring pin G2 is in contact with the first metal member 21, the second metal member 22, and the third metal member 23.

When setting so that the tip of the stirring pin G2 does not reach the second butting portion J2, that is, when the stirring pin G2 contacts only the first metal member 21 and the third metal member 23, the first metal member 21 The metal around the second butted portion J2 is plastically fluidized by frictional heat between the third metal member 23 and the stirring pin G2, and the first metal member 21, the second metal member 22, and the third metal member 23 are joined. Like that.

According to the joining method according to the fourth embodiment described above, since welding is performed on the inner corner, the positions of the first metal member 21, the second metal member 22, and the third metal member 23 during the friction stirring step. Deviation and separation can be prevented. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of the 1st metal member 21, the 2nd metal member 22, and the 3rd metal member 23 can be prevented. Moreover, although it deform | transforms so that the

back surface

21a, 23a side of the 1st metal member 21 and the 3rd metal member 23 may become concave by the welding heat at the time of welding, the said deformation | transformation can be corrected with the friction heat at the time of friction stir welding. . Thereby, the

surfaces

21b and 23b of the first metal member 21 and the third metal member 23 can be flattened.

Further, the

mounts

4 and 4 of the present embodiment have chamfered

portions

4a and 4a formed at portions facing the inner corners. When the first metal member 21, the second metal member 22, and the third metal member 23 are arranged on the

gantry

4, 4, the weld metal 3 and the gantry 4 interfere and the first metal member 21, the second metal member 22. The third metal member 23 may be lifted from the gantry 4, but according to the present embodiment, it is possible to prevent the

weld metals

3 and 3 and the gantry 4 from interfering with each other.

Moreover, in the friction stirring process of this embodiment, since the friction stirring is performed while pushing the shoulder portion G1 into the first metal member 21 and the third metal member 23, the plastic fluid material can be pressed by the shoulder portion G1, Occurrence can be reduced.

[Fifth embodiment]
Next, the joining method according to the fifth embodiment of the present invention will be described. As shown in FIGS. 7A and 7B, the joining method according to the fifth embodiment is different from the fourth embodiment in that a rotating tool F is used instead of the rotating tool G.

In the joining method according to the fifth embodiment, a butt process, a welding process, and a friction stirring process are performed. Since the butting process and the welding process are the same as those in the fourth embodiment, description thereof is omitted.

In the friction stirring step, a rotating stirring pin F2 is inserted into the first butting portion J1, and the rotating tool F is relatively moved along the first butting portion J1. A plasticized region W is formed in the movement trajectory of the rotary tool F. The insertion depth of the stirring pin F2 is preferably set so that the tip of the stirring pin F2 reaches the second butting portion J2. That is, it is preferable to perform the friction stir welding in a state where the stirring pin F2 is in contact with the first metal member 21, the second metal member 22, and the third metal member 23.

When setting so that the tip of the stirring pin F2 does not reach the second butting portion J2, that is, when the stirring pin F2 contacts only the first metal member 21 and the third metal member 23, the first metal member 21 The metal around the second butted portion J2 is plastically fluidized by frictional heat between the third metal member 23 and the stirring pin F2, and the first metal member 21, the second metal member 22, and the third metal member 23 are joined. Like that.

According to the joining method which concerns on 5th embodiment demonstrated above, since it welds to an inner corner, the position of the 1st metal member 21, the 2nd metal member 22, and the 3rd metal member 23 at the time of a friction stirring process Deviation and separation can be prevented. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of the 1st metal member 21, the 2nd metal member 22, and the 3rd metal member 23 can be prevented. Moreover, although it deform | transforms so that the

back surface

surfaces

Moreover, in the friction stirring process of this embodiment, using the rotary tool F, only the stirring pin F2 is used for the first metal member 21, the second metal member 22, and the third metal member 23 (or the first metal member 21 and the third metal member). Since the friction stir welding is performed in a state where it is in contact with only the metal member 23), the friction stir welding can be performed to a deep position without applying a large load to the friction stirrer. Therefore, the rotary tool F is particularly advantageous when the plate thickness of the first metal member 21 and the third metal member 23 is large. Moreover, since the rotation tool F can make the width | variety of the plasticization area | region W small compared with the case where a shoulder part is pushed in, it is advantageous also when the plate | board thickness of the 2nd metal member 22 is thin.

[Sixth embodiment]
A joining method according to a sixth embodiment of the present invention will be described in detail with reference to the drawings. As shown to (a) of FIG. 8, in the joining method which concerns on this embodiment, the 1st metal member 101 and the 2nd metal member 102 are overlapped, and it joins by friction stirring.

Both the first metal member 101 and the second metal member 102 have a plate shape. Although the plate | board thickness of the 1st metal member 101 and the 2nd metal member 102 may be formed differently, in this embodiment, it is the same. The first metal member 101 and the second metal member 102 are appropriately selected from metals capable of frictional stirring, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium oxide, and magnesium alloy.

In the joining method according to the present embodiment, an overlapping process, a welding process, a tab material joining process, a first regular joining process, and a second regular joining process are performed. As shown in FIG. 8A, the superimposing step is a step of superposing the front surface 101a of the first metal member 101 and the back surface 102b of the second metal member 102 to form the overlapping portion J3. The first metal member 101 and the second metal member 102 are restrained on a gantry (not shown) through a clamp so as not to move. An inner corner U1 is formed by the surface 101a of the first metal member 101 and the end face 102c of the second metal member 102. An inner corner U <b> 2 is formed by the back surface 102 b of the second metal member 102 and the end surface 101 c of the first metal member 101. The “front surface” means a surface opposite to the “back surface”.

The welding process is a process of welding the inner corners U1 and U2 as shown in FIG. The type of welding is not limited, but in this embodiment, overlay welding such as laser welding, TIG welding, or MIG welding is performed. What is necessary is just to supply a filler material suitably as needed. In the welding process, build-up welding is continuously performed in one pass over the entire length of the inner corners U1 and U2. A weld metal M is formed in each of the inner corners U1, U2.

The tab material joining step is a step of joining the tab materials T1 and T2 to both sides of the overlapping portion J3 as shown in FIG. The tab members T1 and T2 are made of the same material as the first metal member 101 and the second metal member 102 and have a rectangular parallelepiped shape. The height of the tab materials T1 and T2 is equal to the sum of the first metal member 101 and the second metal member 102 in the plate thickness direction. In the tab material joining step, the inner corner formed by the tab material T1, the first metal member 101, and the second metal member 102 is joined by welding. Similarly, the inner corner formed by the tab material T2, the first metal member 101, and the second metal member 102 is joined by welding. The surface T1a of the tab material T1 and the surface 102a of the second metal member 102 are flush with each other, and the back surface T1b and the back surface 101b of the first metal member 101 are flush with each other. Similarly, the surface T2a of the tab member T2 and the surface 102a of the second metal member 102 are flush with each other, and the back surface T2b and the back surface 101b of the first metal member 101 are flush with each other.

The first main joining step is a step of friction stir welding the overlapping portion J3 from the surface 102a side of the second metal member 102 as shown in FIG. In the first main joining step, joining is performed using a rotating tool G (first rotating tool). The rotary tool G includes a columnar shoulder portion G1 and a stirring pin G2 that hangs down from the shoulder portion G1. The stirring pin G2 is tapered toward the tip. A spiral groove is formed on the outer peripheral surface of the stirring pin G2.

In the first main joining step, the start position Sp1 is set on the surface T1a of the tab material T1, and the end position Ep1 is set on the surface T2a of the tab material T2. In the first main joining step, the stirring pin G2 of the rotating tool G that rotates to the start position Sp1 is inserted. Then, the rotary tool G is relatively moved toward the end position Ep1 along the overlapping portion J3. A plasticized region W1 is formed in the movement locus of the rotary tool G.

As shown in FIG. 9B, in the first main joining step, friction stirring is performed while pushing the lower end surface of the shoulder portion G1 of the rotary tool G into the second metal member 102 for about several millimeters. The insertion depth of the stirring pin G2 may be set as appropriate, but is preferably set so that the stirring pin G2 reaches the overlapping portion J3. That is, the friction stir welding is performed in a state where the stirring pin G2 is in contact with both the first metal member 101 and the second metal member 102.

When the stirring pin G2 does not reach the overlapping portion J3, that is, when the stirring pin G2 is brought into contact only with the second metal member 102, the overlapping portion J3 is plastically flowed by frictional heat between the rotary tool G and the second metal member 102. To be joined. When the rotary tool G reaches the end position Ep1, the rotary tool G is detached from the tab material T2. When the first main joining process is completed, the first metal member 101 and the second metal member 102 are turned over and clamped again on the gantry.

The second main joining step is a step of friction stir welding the superposed portion J3 from the back surface 101b side of the first metal member 101 as shown in FIG. In the second main joining step, the rotating tool G is used for joining. In the second main joining step, a start position is set for one of the tab material T1 and the tab material T2, and an end position is set for the other. In the second main joining step, friction stir welding is performed in the same manner as in the first main joining step. That is, while the lower end surface of the shoulder portion G1 of the rotating tool G is pushed into the back surface 101b of the first metal member 101 by several millimeters, the rotating tool G is relatively moved along the overlapping portion J3 to perform friction stirring. A plasticized region W2 is formed in the movement locus of the rotary tool G.

The insertion depth of the stirring pin G2 in the second main joining step may be set as appropriate, but in the present embodiment, it is preferable to set the stirring pin G2 so as to reach the overlapping portion J3. That is, the friction stir welding is performed in a state where the stirring pin G2 is in contact with both the first metal member 101 and the second metal member 102. More specifically, in the present embodiment, the insertion depth is set so that the tip of the stirring pin G2 enters the plasticizing region W1. The plasticized region W1 and the plasticized region W2 overlap.

When the stirring pin G2 does not reach the overlapping portion J3, that is, when the stirring pin G2 is brought into contact only with the first metal member 101, the overlapping portion J3 is plastically flowed by frictional heat between the rotary tool G and the first metal member 101. To be joined. When the rotary tool G reaches the end position, the rotary tool G is detached from the tab material. Thus, the first metal member 101 and the second metal member 102 are joined.

In addition, you may perform the burr cutting process which cuts the burr | flash which generate | occur | produced in the 1st main joining process and the 2nd main joining process as needed. Thereby, the back surface 101b of the 1st metal member 101 and the surface 102a of the 2nd metal member 102 can be finished finely.

According to the joining method according to the sixth embodiment described above, the joint strength of the superposed portion J3 can be increased by performing both welding and friction stir welding on the superposed portion J3. Moreover, the position shift of the 1st metal member 101 and the 2nd metal member 102 at the time of a 1st main joining process can be prevented by performing a welding process. Further, by pressing the shoulder portion G1 into the back surface 101b of the first metal member 101 and the front surface 102a of the second metal member 102, the generation of burrs can be suppressed. Moreover, although the 2nd main joining process may be abbreviate | omitted, joining strength can be raised more by performing both a 1st main joining process and a 2nd main joining process like this embodiment. At the same time, it can be joined in a balanced manner.

[Seventh embodiment]
Next, the joining method according to the seventh embodiment of the present invention will be described. This embodiment is different from the sixth embodiment in that friction stir welding is performed using the rotary tool F (second rotary tool). In the joining method according to the present embodiment, an overlapping process, a welding process, a tab material joining process, a first main joining process, and a second main joining process are performed. Since the overlapping process is the same as that of the sixth embodiment, description thereof is omitted.

In the welding process, the inner corners U1 and U2 are welded. The type of welding is not limited, but in this embodiment, overlay welding such as laser welding, TIG welding, or MIG welding is performed. In the welding process, overlay welding is intermittently performed on the entire length of the inner corners U1 and U2. A weld metal M is formed in the inner corners U1 and U2 with a space therebetween. Since the tab material joining step is the same as that of the sixth embodiment, description thereof is omitted.

The first main joining step is a step of friction stir welding the overlapping portion J3 from the surface 102a side of the second metal member 102 as shown in FIG. In the first main joining process, joining is performed using a rotating tool (shoulderless rotating tool) F. A spiral groove F3 is formed on the outer peripheral surface of the stirring pin F2. By providing the spiral groove F3, the plastic fluidized metal in the friction stir welding is guided to the tip side of the stirring pin F2 by the spiral groove F3. Thereby, the quantity of the metal which overflows outside the to-be-joined metal member (the 1st metal member 101, the 2nd metal member 102) can be decreased.

In the first main joining step, the start position Sp1 is set on the surface T1a of the tab material T1, and the end position Ep1 is set on the surface T2a of the tab material T2. In the first main joining step, the stirring pin F2 of the rotating tool F rotated to the right is inserted into the start position Sp1. Then, the rotary tool F is relatively moved toward the end position Ep1 along the overlapping portion J3. A plasticizing region W1 is formed on the movement locus of the rotary tool F.

As shown in FIG. 11 (b), in the first main joining step, the connecting portion F1 of the rotary tool F is separated from the second metal member 102 and the friction stir welding is performed. That is, the friction stir welding is performed with the base end side of the stirring pin F2 exposed. The insertion depth of the stirring pin F2 may be set as appropriate, but is preferably set so that the stirring pin F2 reaches the overlapping portion J3. That is, friction stir welding is performed in a state where the stirring pin F <b> 2 is in contact with both the first metal member 101 and the second metal member 102.

When the stirring pin F2 does not reach the overlapping portion J3, that is, when the stirring pin F2 is brought into contact only with the second metal member 102, the overlapping portion J3 is plastically flowed by frictional heat between the rotary tool F and the second metal member 102. To be joined. When the rotary tool F reaches the end position Ep1, the rotary tool F is detached from the tab material T2. When the first main joining process is completed, the first metal member 101 and the second metal member 102 are turned over and clamped again on the gantry.

The second main joining step is a step of joining the overlapping portion J3 from the back surface 101b side of the first metal member 101 as shown in FIG. In the second main joining step, the rotary tool F is used to join by friction stirring. In the second main joining step, a start position is set for one of the tab material T1 and the tab material T2, and an end position is set for the other. In the second main joining step, friction stir welding is performed in the same manner as in the first main joining step. That is, the connecting portion F1 of the rotary tool F is separated from the first metal member 101 to perform friction stir welding. A plasticizing region W2 is formed in the movement locus of the rotary tool F.

The insertion depth of the stirring pin F2 in the second main joining step may be set as appropriate, but in this embodiment, it is preferable to set the stirring pin F2 so as to reach the overlapping portion J3. That is, friction stir welding is performed in a state where the stirring pin F <b> 2 is in contact with both the first metal member 101 and the second metal member 102. More specifically, the insertion depth is set so that the tip of the stirring pin F2 enters the plasticizing region W1. The tip side of the plasticized region W1 and the plasticized region W2 overlap.

When the stirring pin F2 does not reach the overlapping portion J3, that is, when the stirring pin F2 is brought into contact with only the first metal member 101, the overlapping portion J3 is plastically flowed by frictional heat between the rotary tool F and the first metal member 101. To be joined. When the rotary tool F reaches the end position, the rotary tool F is detached from the tab material. Thus, the first metal member 101 and the second metal member 102 are joined.

In addition, you may perform the burr cutting process which cuts the burr | flash which generate | occur | produced in the 1st main joining process and the 2nd main joining process as needed. Thereby, the back surface 101b of the 1st metal member 101 and the surface 102a of the 2nd metal member 102 can be finished finely. Moreover, when the recessed groove formed in the back surface 101b of the 1st metal member 101 and the surface 102a of the 2nd metal member 102 is large, you may perform the repair process which performs overlay welding and repairs.

According to the joining method according to the seventh embodiment, by performing both welding and friction stir welding on the superposed portion J3, the joint strength of the superposed portion J3 can be increased. Moreover, the position shift of the 1st metal member 101 and the 2nd metal member 102 at the time of a 1st main joining process can be prevented by performing a welding process. Further, since the frictional resistance can be reduced by performing the first main joining process and the second main joining process using the rotary tool F, the friction stirrer (not shown) can be deeply moved without applying a large load. Friction stirring can be performed. When the plate thickness of the first metal member 101 and the second metal member 102 is large, it is effective to perform friction stirring using the rotary tool F.

In addition, according to the rotating tool F, the width of the plasticized regions W1 and W2 can be reduced, so that the width of the overlapping portion J3 (the overlap margin of the first metal member 101 and the second metal member 102) is reduced. Can do. Moreover, although the 2nd main joining process may be abbreviate | omitted, joining strength can be raised more by performing both a 1st main joining process and a 2nd main joining process like this embodiment. At the same time, it can be joined in a balanced manner.

In the seventh embodiment, the first main joining process and the second main joining process are performed using the rotating tool F, but the rotating tool G may be used. In this case, the first main joining step and the second main joining step may be performed in a state where the base end side of the stirring pin G2 of the rotary tool G is exposed.

[Eighth embodiment]
Next, the joining method according to the eighth embodiment of the present invention will be described. In the joining method according to the present embodiment, an overlapping process, a welding process, and a main joining process are performed. Since the overlapping process and the welding process are the same as in the sixth embodiment, the description thereof is omitted.

This joining process is a process of performing friction stir welding to the superposition part J3 using the bobbin rotating tool H as shown in FIG. The bobbin rotating tool H includes a first shoulder portion H1, a second shoulder portion H2, and a stirring pin H3. The first shoulder portion H1 has a substantially cylindrical shape. A tapered portion H1a having a diameter reduced toward the stirring pin H3 is formed on the stirring pin H3 side of the first shoulder portion H1. An end face H1b is formed at the end of the tapered portion H1a.

The second shoulder portion H2 has a substantially cylindrical shape. A taper portion H2a having a diameter reduced toward the stirring pin H3 is formed on the stirring pin H3 side of the second shoulder portion H2. An end face H2b is formed at the end of the tapered portion H2a. The stirring pin H3 is a shaft-like member that connects the first shoulder portion H1 and the second shoulder portion H2.

In the main joining step, as shown in FIG. 14 (a), the first metal member 101 and the second metal member 102 are clamped on a frame (not shown) so as not to move, and then the first metal member 101 and the second metal member are clamped. The bobbin rotation tool H is positioned on the side of the member 102. The height position is adjusted so that the longitudinal center of the stirring pin H3 is positioned on the extension of the overlapping portion J3. Then, as shown in FIG. 14B, while rotating the bobbin rotating tool H, the bobbin rotating tool H is caused to enter the first metal member 101 and the second metal member 102 and relatively moved along the overlapping portion J3. Since the length of the stirring pin H3 (the distance between the first shoulder portion H1 and the second shoulder portion H2) is smaller than the sum of the plate thicknesses of the first metal member 101 and the second metal member 102, the second metal The first shoulder portion H1 (end surface H1b) is pushed into the surface 102a of the member 102, and the second shoulder portion H2 (end surface H2b) is pushed into the back surface 101b of the first metal member 101. A plasticizing region W is formed in the movement locus of the bobbin rotating tool H. Thus, the first metal member 101 and the second metal member 102 are joined.

In addition, you may perform the burr cutting process which cuts the burr | flash which generate | occur | produced at this joining process as needed. Thereby, the back surface 101b of the 1st metal member 101 and the surface 102a of the 2nd metal member 102 can be finished finely.

According to the joining method according to the eighth embodiment described above, the joining strength of the superposed part J3 can be increased by performing friction stir welding on the superposed part J3 in addition to the welding process. Moreover, the position shift of the 1st metal member 101 and the 2nd metal member 102 at the time of this joining process can be prevented by performing a welding process. Further, by performing the main joining step using the bobbin rotating tool H, the entire thickness direction of the first metal member 101 and the second metal member 102 can be joined in one pass. Further, by pressing the first shoulder portion H1 into the front surface 102a of the second metal member 102 and pressing the second shoulder portion H2 into the back surface 101b of the first metal member 101, the generation of burrs can be suppressed.

Although the 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, the second main joining process in the sixth embodiment may be performed using the rotary tool F. That is, as shown in FIG. 10, the rotation tool F may be used instead of the rotation tool G in the second main joining process. In this case, only the stirring pin F2 of the rotary tool F is brought into contact with both the first metal member 101 and the second metal member 2, or only the first metal member 101, and friction stirring is performed. In this case, the plasticized regions are overlapped.

Further, the second main joining step in the seventh embodiment may be performed using the rotary tool G. That is, as shown in FIG. 12, the second main joining process may be performed using the rotary tool G instead of the rotary tool F. In this case, friction stirring is performed while pushing the shoulder G1 of the rotary tool G into the back surface 101b of the first metal member 101. The rotary tool G performs friction stirring in a state where only the first metal member 101 or both the first metal member 101 and the second metal member 102 are in contact with each other. In this case, the plasticized regions are overlapped.

In the sixth embodiment and the seventh embodiment, the tab members T1 and T2 are provided, but may be omitted.

1 1st metal member 1a back surface 1b surface 2 2nd metal member 2a back surface 2b surface 3 weld metal 4 mount 4a chamfered portion 101 first metal member 101a surface 101b back surface 102 second metal member 102a surface 102b back surface J butting portion J1 first Butt J2 Second Butt J3 Superposition F Rotating Tool F2 Stirring Pin G Rotating Tool G1 Shoulder G2 Stirring Pin H Bobbin Rotating Tool U1 Inner Corner U2 Inner Corner

Claims

A butting step of butting the back surface of the plate-shaped first metal member and the end surface of the plate-shaped second metal member to form a butting portion;
A welding step of welding the inner corner formed by the back surface of the first metal member and the side surface of the second metal member;
The stirring pin of the rotating tool is inserted into the first metal member from the surface side opposite to the back surface of the first metal member, the rotating tool is moved along the abutting portion, and the stirring pin is moved to the first metal member. A friction stirring step of friction stir welding the butted portion in a state where only one metal member or both the first metal member and the second metal member are in contact with each other,
In the friction stir step, the butting portion is friction stir welded while pushing the shoulder portion of the rotary tool into the surface of the first metal member.
A butting step of butting the back surface of the plate-shaped first metal member and the end surface of the plate-shaped second metal member to form a butting portion;
A welding step of welding the inner corner formed by the back surface of the first metal member and the side surface of the second metal member;
The stirring pin of the rotating tool is inserted into the first metal member from the surface side opposite to the back surface of the first metal member, the rotating tool is moved along the abutting portion, and only the stirring pin is A friction agitation step of friction agitation joining the butted portion in a state where only the first metal member or both the first metal member and the second metal member are in contact with each other.
The end face of the plate-like first metal member and the end face of the plate-like third metal member are abutted to form a first butting portion, and the back surface of the first metal member and the back surface of the third metal member A butting step of matching the end faces of the two metal members to form a second butting portion;
Welding is applied to the inner corner formed by the back surface of the first metal member and the side surface of the second metal member, and the inner corner is formed by the back surface of the third metal member and the side surface of the second metal member. Welding process for welding to
A stirring pin of a rotating tool is inserted into the first abutting portion from the surface side opposite to the back surface of the first metal member and the surface side opposite to the back surface of the third metal member, and the rotating tool is The stirrer pin is moved along one butting portion so that only the first metal member and the third metal member or all of the first metal member, the second metal member and the third metal member are brought into contact with each other. A friction stir process in which the first butted portion and the second butted portion are friction stir welded,
In the friction stirring step, the first butting portion and the second butting portion are friction stir welded while pushing the shoulder portion of the rotary tool into the surface of the first metal member and the surface of the third metal member. Joining method.
The end face of the plate-like first metal member and the end face of the plate-like third metal member are abutted to form a first butting portion, and the back surface of the first metal member and the back surface of the third metal member A butting step of matching the end faces of the two metal members to form a second butting portion;
Welding is applied to the inner corner formed by the back surface of the first metal member and the side surface of the second metal member, and the inner corner is formed by the back surface of the third metal member and the side surface of the second metal member. Welding process for welding to
A stirring pin of a rotating tool is inserted into the first abutting portion from the surface side opposite to the back surface of the first metal member and the surface side opposite to the back surface of the third metal member, and the rotating tool is Move along one butting part and contact only the stirring pin with only the first metal member and the third metal member, or all of the first metal member, the second metal member and the third metal member A friction stir process in which the first butted portion and the second butted portion are friction stir welded.
5. The joining method according to claim 1, wherein in the welding step, build-up welding is continuously performed on the inner corner in one pass.
The joining method according to any one of claims 1 to 4, wherein in the welding step, build-up welding is intermittently performed with a gap in the inner corner.
5. The joining method according to claim 1, wherein in the welding step, laser welding, MIG welding, or TIG welding is performed.
In the friction stirring step, a pair of mounts are arranged on both sides of the second metal member,
The joining method according to any one of claims 1 to 4, wherein a chamfered portion is formed in a portion of the gantry facing the inner corner.
An overlapping step of overlapping the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a superposed portion;
The inner corner formed by the end surface of the first metal member and the back surface of the second metal member is welded, and the inner corner formed by the surface of the first metal member and the end surface of the second metal member Welding process to weld,
A rotary tool including a stirring pin and a shoulder portion is inserted from the surface side opposite to the back surface of the second metal member, and the stirring pin is inserted only in the second metal member, or the first metal member and the second metal member. A first main joining step of friction stir welding the overlapped portion by relatively moving the rotary tool along the overlapped portion in contact with both metal members,
In the first main joining step, a friction stir welding is performed while pressing the shoulder portion of the rotary tool into the surface of the second metal member.
An overlapping step of overlapping the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a superposed portion;
The inner corner formed by the end surface of the first metal member and the back surface of the second metal member is welded, and the inner corner formed by the surface of the first metal member and the end surface of the second metal member Welding process to weld,
A rotary tool including a stirring pin is inserted from the surface side opposite to the back surface of the second metal member, and only the stirring pin is inserted into the second metal member only, or the first metal member and the second metal member. And a first main joining step of relatively moving the rotary tool along the superposed part and friction stir welding the superposed part in a state where both are in contact with each other.
A rotary tool having a stirring pin and a shoulder portion is inserted from the back side opposite to the surface of the first metal member, and the stirring pin of the rotary tool is only the first metal member or the first metal member and A second main joining step of friction stir welding the superposed part by relatively moving the rotary tool along the superposed part in a state of being in contact with both of the second metal members,
In the second main joining step, friction stir is performed while pushing the shoulder portion of the rotating tool into the back surface of the first metal member, and the plasticized region and the second main joining in the first main joining step are performed. The joining method according to claim 9 or 10, wherein the plasticizing region of the process is overlapped.
A rotary tool provided with a stirring pin is inserted from the back side opposite to the surface of the first metal member, and only the first metal member or only the first metal member and the second metal A second main joining step in which the rotating tool is relatively moved along the overlapped portion in contact with both of the metal members to friction stir weld the overlapped portion.
The plasticizing region of the first main joining step and the plasticizing region of the second main joining step are overlapped with each other in the second main joining step. Joining method.
An overlapping step of overlapping the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a superposed portion;
The inner corner formed by the end surface of the first metal member and the back surface of the second metal member is welded, and the inner corner formed by the surface of the first metal member and the end surface of the second metal member Welding process to weld,
A bobbin rotating tool provided with a pair of shoulder portions and a stirring pin connecting between the shoulder portions, and a main joining step of frictionally stir welding the overlapped portion by relatively moving a bobbin rotating tool along the overlapped portion,
In the main joining step, the friction stirring is performed in a state where the pair of shoulder portions are in contact with the first metal member and the second metal member, respectively.
The joining method according to any one of claims 9, 10, and 13, wherein in the welding step, build-up welding is continuously performed on the inner corner in one pass.
The joining method according to any one of claims 9, 10, and 13, wherein in the welding step, build-up welding is performed intermittently with a gap between the inner corners.
The joining method according to any one of claims 9, 10, and 13, wherein laser welding, MIG welding, or TIG welding is performed in the welding step.