WO2017221684A1

WO2017221684A1 - Joining method

Info

Publication number: WO2017221684A1
Application number: PCT/JP2017/020872
Authority: WO
Inventors: 堀　久司; 伸城瀬尾
Original assignee: 日本軽金属株式会社
Priority date: 2016-06-20
Filing date: 2017-06-05
Publication date: 2017-12-28
Also published as: CN108430687A; CN108430687B

Abstract

A joining method for joining a first metallic member (1) and a second metallic member (2) using a rotating tool (F) provided with a stirring pin (F2) is characterized by comprising: a butting step for butting an end surface (1a) of the first metallic member (1) against a back surface (2c) of the second metallic member (2) to form a butting portion (J1); a placement step for placing an auxiliary member (10) in a position corresponding to the first metallic member (1) within a front surface (2b) of the second metallic member (2); and a friction stir step for inserting the rotating stirring pin (F2) from the side of a front surface (10a) of the auxiliary member (10), and friction stir joining the butting portion (J1) by relatively moving the rotating tool (F) in a state in which only the stirring pin (F2) is brought into contact with the second metallic member (2) and the auxiliary member (10) or the first metallic member (1), the second metallic member (2) and the auxiliary member (10).

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 the end surface of the first metal member and the back surface of the second metal member are butted together, a rotating tool is inserted from the surface side of the second metal member, and the butted portion is friction stir welded.

For example, Patent Document 3 discloses a technique for performing friction stir welding of a butted portion by inserting only a stirring pin of a rotating tool into inner corners of metal members vertically butted. The conventional rotary tool of the friction stir welding method does not include a shoulder portion, and only the stirring pin of the rotary tool is inserted into the inner corner, so that the friction stir can be performed up to a deep position of the butt portion.

Japanese Patent No. 3947271 Japanese Patent No. 4056587 JP 2013-049072 A

The conventional technique has a problem that the load applied to the friction stirrer increases because the shoulder of the rotary tool is brought into contact with the surface of the second metal member for friction stir. Further, since the shoulder portion of the rotary tool is brought into contact with the surface of the second gold member, the width of the plasticizing region is increased. In order to prevent the plastic fluid from flowing out from the inner corners of the first metal member and the second metal member, the plate thickness of the first metal member must be increased.

Also, since the conventional technique is a form in which the first metal member is inserted into the concave groove of the second metal member, there is a problem that the positions of the metal members are shifted in the longitudinal direction of the first metal member during friction stir welding. Moreover, at the time of friction stir welding, there exists a possibility that it may leave | separate so that a 2nd metal member may float with respect to a 1st metal member, and it may become a joining defect. Moreover, in the conventional joining method, since the lower end surface of the shoulder part of a rotary tool is pushed in on the surface of a 2nd metal member and this joining process is performed, there exists a problem that the load concerning a friction stirring apparatus becomes large. Moreover, since the lower end surface of the shoulder portion of the rotary tool is pushed into the surface of the second metal member to perform the main joining process, there is a problem that the heat input increases and the thermal strain of the first metal member and the second metal member increases. is there.

In the friction stir welding method disclosed in Patent Document 3, the metal fluidized plastically in the shoulder portion is not pressed down, so that the plastic fluidized metal tends to overflow to the outside of the inner corner. As a result, there is a problem that the inner corner becomes lack of metal.

From such a viewpoint, an object of the present invention is to provide a joining method that can reduce the load applied to the friction stirrer and has a high degree of design freedom.
Moreover, this invention makes it a subject to provide the joining method which can improve the joining precision while reducing the load concerning a friction stirrer, and can make the thermal strain of each metal member small.
Moreover, this invention makes it a subject to provide the joining method which can eliminate the metal shortage of an inner corner, when carrying out friction stir welding of the inner corner of metal members.

In order to solve such a problem, the present invention is a joining method for joining a first metal member and a second metal member using a rotary tool provided with a stirring pin, and includes an end face of the first metal member, A butting step of butting the back surface of the second metal member to form a butting portion, an arrangement step of placing an auxiliary member at a position corresponding to the first metal member on the surface of the second metal member, and rotation The stirring pin was inserted from the surface side of the auxiliary member, and only the stirring pin was brought into contact with the second metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member. And a friction stir process in which the abutting portion is friction stir welded by relatively moving the rotary tool in a state.

According to this joining method, the friction stir welding is performed in a state where only the stirring pin is in contact with the second metal member and the auxiliary member, or the first metal member, the second metal member and the auxiliary member. In comparison, the load on the friction stirrer can be reduced. Moreover, since only the stirring pin is inserted, the width of the plasticized region can be reduced. Thereby, since the plate | board thickness of a 1st metal member can also be made small, the freedom degree of design can be raised. In addition to the first metal member and the second metal member, the auxiliary member can also be friction stir welded to prevent metal shortage at the joint.

Further, it is preferable to include a removing step of removing the auxiliary member on which the burr is formed from the second metal member. According to this joining method, the burr can be easily removed together with the auxiliary member.

In the friction stirring step, it is preferable to insert the stirring pin in the center of the auxiliary member. According to this joining method, the rotating tool can be easily inserted into the auxiliary member.

Further, when the position through which the rotation center axis of the rotary tool passes is set as a joining reference line, in the placement step, the auxiliary member is placed only on one side with respect to the joining reference line, and in the friction stirring step, It is preferable to set a joining condition so that the burr is generated in the auxiliary member.

According to such a joining method, since burrs can be concentrated on the auxiliary member arranged only on one side with respect to the joining reference line, the burrs can be more easily removed.

Further, when the position through which the rotation center axis of the rotary tool passes is set as a joining reference line, the auxiliary member is arranged to straddle the joining reference line in the placement step and the friction stirring step, and the joining reference line In contrast, it is preferable that the burr is generated in the auxiliary member on one side, and the arrangement position and joining conditions of the auxiliary member are set so that the auxiliary member does not remain on the other side after the friction stirring step.

According to such a joining method, it is possible to prevent a metal shortage at the joint part in a well-balanced manner. Further, after the friction stirring step, the auxiliary member remaining only on one side is removed together with the burr, so that the burr can be more easily removed.

Further, the present invention only includes an abutting step in which an end face of the plate-like first metal member and an underside of the plate-like second metal member are abutted to form an abutting portion, and an agitating pin of a rotating tool for temporary bonding that rotates. Is inserted into an inner corner constituted by the first metal member and the second metal member, and a temporary joining step for spot temporary joining along the inner corner and a rotating tool for main joining to be rotated are provided in the second The book is inserted from the surface side of the metal member, and only the stirring pin of the rotating tool for main joining is in contact with the second metal member or both the first metal member and the second metal member. And a main joining step in which the abutting portion is frictionally stirred and joined by relatively moving the joining rotary tool.

According to such a joining method, since the metal members are temporarily spot-joined in the provisional joining step, the metal members can be separated from each other and misalignment can be prevented during the main joining step. Thereby, joining accuracy can be raised. Moreover, since only the stirring pin is inserted into each metal member in both the main joining step and the temporary joining step, the amount of heat input can be reduced, and the thermal strain of each metal member can be reduced. Moreover, since only the stirring pin is inserted into each metal member in both the main joining step and the temporary joining step, the load on the friction stirrer can be reduced.

Moreover, it is preferable that the rotary tool for temporary joining and the rotary tool for main joining are the same. According to this joining method, it is not necessary to replace the rotary tool during the temporary joining step and the main joining step, so that the working efficiency can be improved.

The present invention also includes a butting step of butting the end surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a butting portion, the first metal member, and the second metal member. A temporary joining step for performing spot temporary joining by welding along an inner corner constituted by the above, and a rotating tool for main joining to be rotated is inserted from the surface side of the second metal member, and the rotating tool for main joining is agitated. In the state where only the pin is in contact with the second metal member or both the first metal member and the second metal member, the rotational tool for relative welding is relatively moved to friction stir weld the butt portion. And a main joining step.

According to such a joining method, since the metal members are temporarily spot-joined in the provisional joining step, the metal members can be separated from each other and misalignment can be prevented during the main joining step. Thereby, joining accuracy can be raised. In addition, spot temporary bonding is performed in the temporary bonding process, and only the stirring pin is inserted into each metal member in the main bonding process. Therefore, the amount of heat input can be reduced, and the thermal strain of each metal member can be decreased. Moreover, since only a stirring pin is inserted in each metal member in this joining process, the load concerning a friction stirring apparatus can be made small.

The welding is preferably TIG welding, MIG welding or laser welding.

Further, the present invention provides a butt portion by inserting the end surface of the plate-like second metal member into the groove of the first metal member having a plate shape and having a groove on the back surface, and butting the end surface against the bottom surface of the groove. An abutting step for forming an auxiliary member, an auxiliary member disposing step for disposing an auxiliary member at an inner corner formed by a back surface of the first metal member and a side surface of the second metal member, and a stirring pin of the rotary tool from the inner corner And inserting the rotating tool stirring pin from the surface side of the first metal member, by relatively moving the rotating tool along the inner corner and friction stir welding the inner corner. A butt portion friction stirring step of relatively moving the rotary tool along the concave groove to friction stir weld the butt portion, and in the inner corner friction stirring step, only the stirring pin is the first Metal member, second metal member and auxiliary The inner corners are friction stir welded in contact with the material, and the stir pin is only the first metal member or both the first metal member and the second metal member in the butt friction friction stir step. The butt portion is friction stir welded in a state in which the butt portion is brought into contact with.

According to this method, the auxiliary member is disposed in the inner corner, and the friction stir welding of the inner corner is performed via the auxiliary member. Thereby, since the metal shortage of the inner corner can be solved by the auxiliary member, it is possible to prevent the bonding failure.
Moreover, according to this method, since the friction stir welding is performed at the inner corner, it is possible to prevent the first metal member and the second metal member from being displaced or separated from each other during the abutting portion friction stirring step. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of a 1st metal member and a 2nd metal member can be prevented.
Moreover, according to this method, since the concave groove is formed in the first metal member, the thickness of the portion of the first metal member where the concave groove is formed is thinner than the thickness of the other portion. . As a result, in the butt portion friction agitation process, the depth at which the agitation pin is inserted can be reduced compared to the case where the concave groove is not formed. Bonding can be performed.

Further, in the abutting portion friction stirring step, only the stirring pin of the rotating tool is inserted from the surface of the first metal member, and only the stirring pin is only the first metal member, or the first metal member and the first metal member. The butt portion is preferably friction stir welded while being in contact with both of the two metal members.

This makes it possible to reduce the width of the plasticizing region because only the stirring pin of the rotary tool is in contact with the metal member. 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.

Further, in the abutting portion friction stirring step, the rotating tool has a shoulder portion having a cylindrical shape and an agitating pin depending from the shoulder portion, and the diameter of the shoulder portion is set smaller than the width of the concave groove. It is preferable.

This makes it possible to reduce the occurrence of burrs because the shoulder of the rotary tool is pushed into the metal member. In addition, since the groove | channel of a plasticization area | region will become shallow if the pushing amount of a shoulder part is made small, the surface of a 1st metal member can be finished finely. Moreover, since the diameter of the shoulder portion is formed to be smaller than the width of the concave groove, the material plastically fluidized by the stirring pin of the rotary tool is prevented from jumping out from the inner corners of the first metal member and the second metal member. be able to.

Further, it is preferable to include a removing step of removing the auxiliary member on which the burr is formed from the first metal member or the second metal member. Thereby, a burr | flash can be easily removed with the auxiliary member.

In the inner corner friction stir step, it is preferable to set the joining conditions of the rotating tool so that burrs generated in the friction stir welding are formed on the auxiliary member. Thereby, a burr | flash can be removed more easily.

In addition, the present invention provides a plate-like end surface of the first metal member that has a notched corner on the back surface and a plate-shaped end surface of the third metal member that has a notched corner on the back surface. Forming a first butting portion having a groove, and inserting the end face of the plate-like second metal member into the concave groove, butting the end face to the bottom surface of the concave groove to form a second butting portion; An auxiliary member is disposed at an inner corner formed by the back surface of the first metal member and the side surface of the second metal member, and is formed by the back surface of the third metal member and the side surface of the second metal member. Auxiliary member placement step of placing an auxiliary member in the inner corner, and inserting a stirring pin of a rotating tool from the inner corner, and relatively moving the rotating tool along the inner corner, thereby friction stir welding the inner corner Inner corner friction stirring step, surface side of the first metal member and the first Abutting portion friction stirrer that inserts a stirring pin of a rotating tool from the surface side of the metal member and relatively moves the rotating tool along the concave groove to friction stir weld the first butting portion and the second butting portion. And in the inner corner friction stirring step, only the stirring pin is in contact with either the first metal member or the third metal member, the second metal member, and the auxiliary member. The inner corner is friction stir welded, and in the butt friction friction stir step, the stir pin is only the first metal member and the third metal member, or the first metal member, the third metal member and the first The first butted portion and the second butted portion are friction stir welded while being in contact with a bimetallic member.

According to this method, the auxiliary member is disposed in the inner corner, and the friction stir welding of the inner corner is performed via the auxiliary member. Thereby, since the metal shortage of the inner corner can be solved by the auxiliary member, it is possible to prevent the bonding failure.
Moreover, according to this method, since the friction stir welding is performed at the inner corner, the positions of the first metal member and the second metal member and the third metal member and the second metal member at the time of the butt portion 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 a 1st metal member, a 2nd metal member, and a 3rd metal member can be prevented.
Moreover, according to this method, the plate | board thickness of the 1st metal member and the 3rd metal member of the part in which a ditch | groove is formed is thinner than the plate | board thickness of another part. As a result, in the butt portion friction agitation process, the depth at which the agitation pin is inserted can be reduced compared to the case where the concave groove is not formed. Bonding can be performed.

Moreover, this invention is a joining method which joins a 1st metal member and a 2nd metal member using the rotary tool provided with the stirring pin, Comprising: The said ditch | groove of the said 2nd metal member which has a ditch | groove on the back surface A matching step of inserting an end surface of the first metal member and butting the end surface against the bottom surface of the concave groove to form a butting portion, and corresponding to the first metal member among the surfaces of the second metal member An arrangement step of arranging an auxiliary member at a position, and the rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is inserted into the second metal member and the auxiliary member, or the first metal member. And a friction stir step in which the rotating tool is relatively moved while being in contact with the second metal member and the auxiliary member, and the abutting portion is friction stir welded.

According to this joining method, the friction stir welding is performed in a state where only the stirring pin is in contact with the second metal member and the auxiliary member, or the first metal member, the second metal member and the auxiliary member. In comparison, the load on the friction stirrer can be reduced. Moreover, since only the stirring pin is inserted, the width of the plasticized region can be reduced. Thereby, since the plate | board thickness of a 1st metal member can also be made small, the freedom degree of design can be raised. In addition to the first metal member and the second metal member, the auxiliary member can also be friction stir welded to prevent metal shortage at the joint. Furthermore, since the end surface of the first metal member is inserted into the groove of the second metal member and the end surface is abutted against the bottom surface of the groove, misalignment between the first metal member and the second metal member is prevented during the abutting process. be able to.

Further, when the position through which the rotation center axis of the rotary tool passes is set as a joining reference line, in the placement step and the friction stirring step, the auxiliary member is placed across the joining reference line, and the joining reference It is preferable that the burr is generated in the auxiliary member on one side with respect to the line, and the arrangement position and joining conditions of the auxiliary member are set so that the auxiliary member does not remain on the other side after the friction stirring step.

Moreover, in order to solve such a problem, the present invention is a joining method for joining a first metal member, a second metal member, and a third metal member using a rotary tool equipped with a stirring pin, The end surface of the second metal member that has a shape and has a corner on the back side cut out, and the end surface of the third metal member that has a plate shape and has a corner on the back side cut out to form a groove and a first butt A step of forming a second abutting portion by forming a second abutting portion by inserting an end surface of the plate-like first metal member into the concave groove and abutting the end surface against the bottom surface of the concave groove; And arranging the auxiliary member at a position corresponding to the first metal member among the surfaces of the third metal member, and inserting the stirring pin of the rotary tool from the surface side of the auxiliary member, Are moved relative to each other along the groove, and the first A friction stirring step of friction stir welding the mating portion and the second butting portion, and in the friction stirring step, only the stirring pin is connected to the second metal member, the third metal member and the auxiliary member, or the The first butted portion and the second butted portion are friction stir welded in contact with the second metal member, the third metal member, the first metal member, and the auxiliary member.

According to this joining method, only the stirring pin is in contact with the second metal member, the third metal member and the auxiliary member, or the second metal member, the third metal member, the first metal member and the auxiliary member. Since the friction stir welding is performed, the load applied to the friction stirrer can be reduced as compared with the prior art. Moreover, since only the stirring pin is inserted, the width of the plasticized region can be reduced. Thereby, since the plate | board thickness of a 1st metal member can also be made small, the freedom degree of design can be raised. In addition to the first metal member, the second metal member, and the third metal member, the auxiliary member can also be friction stir welded to prevent a metal shortage at the joint. Further, the end surface of the first metal member is inserted into the groove formed by abutting the second metal member and the third metal member and the end surface is abutted against the bottom surface of the groove, Position shift between the second metal member and the third metal member can be prevented.

Further, it is preferable to include a removing step of removing the auxiliary member on which the burr is formed from the second metal member and the third metal member. According to this joining method, the burr can be easily removed together with the auxiliary member.

Further, in the arranging step, the auxiliary member is arranged only on one side with respect to the first butting portion, and in the friction stirring step, a joining condition is set so that the burr is generated in the auxiliary member. preferable.

According to such a joining method, since burrs can be concentrated on the auxiliary member arranged only on one side with respect to the first butting portion, the burrs can be more easily removed.

Moreover, in the arrangement step and the friction stirring step, the auxiliary member is arranged so as to straddle the first abutting portion, and the burr is generated in the auxiliary member on one side with respect to the first abutting portion, And it is preferable to set the arrangement | positioning position and joining conditions of an auxiliary member so that the said auxiliary member may not remain on the other side after the said friction stirring process.

Moreover, this invention inserts the end surface of a plate-shaped 1st metal member in the said ditch | groove of the 2nd metal member which exhibits a plate shape and has a ditch | groove on the back surface, and matches the said end surface with the bottom face of the said ditch | groove. Inserting only the stirring pin of the butting step for forming the butting portion and the rotating tool for rotating temporary bonding into the inner corner constituted by the first metal member and the second metal member, and spotting along the inner corner A temporary joining step for performing temporary joining and a rotating tool for main joining to rotate are inserted from the surface side of the second metal member, and only the stirring pin of the rotating tool for main joining is used for the second metal member or the A main joining step of frictionally stir welding the butt portion by relatively moving the rotary tool for main joining in a state of being in contact with both the first metal member and the second metal member.
In addition, the present invention provides a plate-like end surface of the second metal member that has a notched corner on the back surface and a plate-shaped end surface of the third metal member that has a notched corner on the back surface. A step of forming a groove and a first abutting portion, inserting an end face of a plate-like first metal member into the concave groove and abutting the end face against the bottom surface of the concave groove to form a second abutting portion; and rotation Insert only the stirring pin of the rotary tool for temporary joining into the inner corner composed of the first metal member and the second metal member and the inner corner composed of the first metal member and the third metal member. Then, a temporary bonding step for performing spot temporary bonding along the inner corner and a rotating tool for main bonding to be rotated are inserted from the surface side of the second metal member and the third metal member, and the rotating tool for main bonding is performed. Only the stirring pin of the second metal member and the third metal member, The first butting portion and the second butting portion are friction stir welded by relatively moving the main welding rotary tool in contact with the first metal member, the second metal member and the third metal member. And a main joining step.

Moreover, this invention inserts the end surface of a plate-shaped 1st metal member in the said ditch | groove of the 2nd metal member which exhibits a plate shape and has a ditch | groove on the back surface, and matches the said end surface with the bottom face of the said ditch | groove. A butting step for forming a butting portion, a temporary joining step for performing spot temporary joining by welding along an inner corner constituted by the first metal member and the second metal member, and a rotating tool for main joining to rotate. Inserted from the surface side of the second metal member, and only the stirring pin of the main welding rotary tool is in contact with the second metal member or both the first metal member and the second metal member And a main joining step in which the abutting portion is friction stir welded by relatively moving the main welding rotary tool.
In addition, the present invention provides a plate-like end surface of the second metal member that has a notched corner on the back surface and a plate-shaped end surface of the third metal member that has a notched corner on the back surface. A butting step of forming a groove and a first abutting part, inserting an end face of a plate-like first metal member into the concave groove and abutting the end face against the bottom surface of the concave groove to form a second abutting part; A temporary joining step of performing spot temporary joining by welding along an inner corner constituted by the first metal member and the second metal member and an inner corner constituted by the first metal member and the third metal member; The rotating tool for main joining to be rotated is inserted from the surface side of the second metal member and the third metal member, and only the stirring pin of the rotating tool for main joining is inserted into the second metal member and the third metal member. Or the first metal member, the second metal member and the third Said rotary tool for the joint in a state in contact with the genus members are relatively moved, characterized in that it comprises, a main bonding step of friction stir welding said first abutting portion and the second abutting section.

The welding is preferably TIG welding, MIG welding or laser welding.

According to the joining method according to the present invention, the load applied to the friction stirrer can be reduced and the degree of freedom in design can be increased.
Moreover, according to the joining method which concerns on this invention, while reducing the load concerning a friction stirrer, a joining precision can be raised and the thermal strain of each metal member can be made small.
Moreover, according to the joining method which concerns on this invention, when performing friction stir welding of the inner corners of metal members, the metal shortage of an inner corner can be eliminated.

It is a perspective view which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 1st embodiment of this invention. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows after the removal process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 2nd embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 3rd embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 3rd embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 3rd embodiment. It is a perspective view which shows the butt | matching process of the joining method which concerns on 4th embodiment. It is a perspective view which shows the temporary joining process of the joining method which concerns on 4th embodiment. It is a perspective view which shows the main joining process of the joining method which concerns on 4th embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 4th embodiment. It is a perspective view which shows the butt | matching process of the joining method which concerns on 5th embodiment. It is a perspective view which shows the auxiliary member arrangement | positioning process of the joining method which concerns on 5th embodiment. It is a perspective view which shows the inner corner friction stirring process of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the inner corner friction stirring process of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the removal process of the auxiliary member of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the state after the removal process of the auxiliary member of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the butt | matching part friction stirring process (installation process to a mount frame) of the joining method which concerns on 5th embodiment. It is a perspective view which shows the abutting part friction stirring process of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the butt | matching part friction stirring process of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the state after the butt | matching part friction stirring process of the joining method which concerns on 5th embodiment. It is a perspective view which shows the other form (vertical installation) of the auxiliary member arrangement | positioning process of the joining method which concerns on 5th embodiment. It is sectional drawing which shows the butt | matching part friction stirring process of the joining method which concerns on 6th embodiment of this invention. It is a perspective view which shows the butt | matching process of the joining method which concerns on 7th embodiment of this invention. It is a perspective view which shows the auxiliary member arrangement | positioning process of the joining method which concerns on 7th embodiment. It is a perspective view which shows the inner corner friction stirring process of the joining method which concerns on 7th embodiment. It is sectional drawing which shows the inner corner friction stirring process of the joining method which concerns on 7th embodiment. It is sectional drawing which shows the removal process of the auxiliary member of the joining method which concerns on 7th embodiment. It is sectional drawing which shows the state after the removal process of the auxiliary member of the joining method which concerns on 7th embodiment. It is sectional drawing which shows the butt | matching part friction stirring process (installation process to a mount frame) of the joining method which concerns on 7th embodiment. It is a perspective view which shows the butt | matching part friction stirring process of the joining method which concerns on 7th embodiment. It is sectional drawing which shows the butt | matching part friction stirring process of the joining method which concerns on 7th embodiment. It is a perspective view which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 8th embodiment of this invention. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 8th embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 8th embodiment. It is sectional drawing which shows the removal process after the joining method which concerns on 8th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 9th embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 9th embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 9th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 10th embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 10th embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 10th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 11th embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 11th embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 11th embodiment. It is sectional drawing which shows the removal process after the joining method which concerns on 11th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 12th embodiment. It is sectional drawing which shows the butt | matching process and arrangement | positioning process of the joining method which concern on 13th embodiment. It is a perspective view which shows the butt | matching process of the joining method which concerns on 14th embodiment. It is a perspective view which shows the temporary joining process of the joining method which concerns on 14th embodiment. It is a perspective view which shows the main joining process of the joining method which concerns on 14th embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 14th embodiment. It is a perspective view which shows the butt | matching process of the joining method which concerns on 15th embodiment. It is a perspective view which shows the temporary joining process of the joining method which concerns on 15th embodiment.

[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. 1, 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. In the joining method according to the present embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The “front surface” in the description means a surface opposite to the “back surface”.

The first metal member 1 and the second metal member 2 both have a plate shape. 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. The plate thickness dimensions of the first metal member 1 and the second metal member 2 may be set as appropriate.

As shown in FIG. 1, the butting step is a step of butting the end surface 1 a of the first metal member 1 and the back surface 2 c of the second metal member 2 to form a butting portion J1.

The placement step is a step of placing the auxiliary member 10 as shown in FIG. The auxiliary member 10 is a plate-shaped metal member. The plate | board thickness of the auxiliary member 10 is set to the thickness which does not generate | occur | produce a metal shortage in the junction part (plasticization area | region W1) formed in the case of the friction stirring process mentioned later. In this embodiment, the auxiliary member 10 is formed of the same material as the first metal member 1 and the second metal member 2. In the arrangement step, the auxiliary member 10 is arranged at a position corresponding to the first metal member 1 on the surface 2 b of the second metal member 2. The surface 2b of the second metal member 2 and the back surface 10b of the auxiliary member 10 are in surface contact. In the arrangement | positioning process which concerns on this embodiment, it arrange | positions in the position with which the center part of the auxiliary member 10 and the center of the plate | board thickness direction of the 1st metal member 1 substantially overlap.

As shown in FIG. 2, the friction stirring step is a step of inserting the rotating tool F rotating from the surface 10a side of the auxiliary member 10 and friction stir welding the butt portion J1. The rotary tool F includes a connecting portion F1 and a stirring pin F2. 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 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. A spiral groove 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 is formed in a counterclockwise direction from the proximal end toward the distal end.

In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise as it goes from the proximal end to the distal end. 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 to-be-joined metal member (the 1st metal member 1, the 2nd metal member 2, and the auxiliary member 10) can be decreased.

In the friction stirring step, the stirring pin F2 rotated right from the surface 10a of the auxiliary member 10 is inserted. In the friction stirring step, the rotating tool along the abutting portion J1 from the near side to the far side in FIG. 2 with the stirring pin F2 and the first metal member 1, the second metal member 2, and the auxiliary member 10 in contact with each other. Move F relatively. In the friction stirring step, friction stirring is performed with the base end side of the stirring pin F2 exposed. The rotation center axis C of the rotary tool F is set to a position passing through the center of the first metal member 1 in the plate thickness direction. A plasticizing region W1 is formed on the movement locus of the rotary tool F. The insertion depth of the stirring pin F 2 may be set as appropriate, but in the present embodiment, the stirring pin F 2 is set so as to contact the first metal member 1.

In the friction stirring step, only the stirring pin F2 may be brought into contact with the second metal member 2 and the auxiliary member 10 to perform friction stir welding. In this case, the butt portion J1 is plastically fluidized and joined by frictional heat between the second metal member 2 and the stirring pin F2. A burr V is formed on the surface 10 a of the auxiliary member 10.

The removal step is a step of removing the auxiliary member 10 from the second metal member 2 as shown in FIG. In the removal process, the both ends of the auxiliary member 10 are turned up, and the auxiliary member 10 is cut off so as to be bent at the groove D. The concave groove D is a portion that is deeply buried in the plasticized region W1. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Through the above steps, the first metal member 1 and the second metal member 2 are joined in a T-shape when viewed from the front.

According to the joining method according to the present embodiment described above, only the stirring pin F2 is brought into contact with the first metal member 1, the second metal member 2, and the auxiliary member 10, or the second metal member 2 and the auxiliary member 10. Since the friction stir welding is performed in the above state, the load on the friction stirrer can be reduced as compared with the prior art. Thereby, even if the plate | board thickness of the 2nd metal member 2 is large, the butt | matching part J1 in a deep position can be joined in the state which does not apply a big load to a friction stirring apparatus.

Moreover, since only the stirring pin F2 is inserted, the width of the plasticizing region W1 can be reduced. Thereby, since the plate | board thickness of the 1st metal member 1 can also be made small, the freedom degree of design of the 1st metal member 1 can be raised. Moreover, in addition to the 1st metal member 1 and the 2nd metal member 2, the auxiliary member 10 is also friction stir welded, and as shown in FIG. 4, the metal shortage of a junction part (plasticization area | region W1) can be prevented. .

Further, according to the removing step, since the burr V can be removed together with the auxiliary member 10, the surface 2b of the second metal member 2 can be finished finely without performing a separate burr removing operation. Moreover, in the friction stirring process of this embodiment, since the rotation tool F is inserted from the center part of the surface 10a of the auxiliary member 10, the insertion operation of the rotation tool F can be performed easily.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. In the joining method according to the second embodiment, a butting process, an arranging process, a friction stirring process, and a removing process are performed. The joining method according to the second embodiment is different from the first embodiment in the arrangement position of the auxiliary member 10. The joining method according to the second embodiment will be described with a focus on the differences from the first embodiment.

In the butting step, as shown in FIG. 5, the end surface 1 a of the first metal member 1 and the back surface 2 c of the second metal member 2 are butted together to form a butting portion J1 as in the first embodiment.

Here, as shown in FIG. 5, the scheduled position through which the rotation center axis C (see FIG. 6) of the rotary tool F passes is set as a “joining reference line X” during the friction stirring step. In the present embodiment, the joining reference line X is set so as to overlap the center of the first metal member 1 in the plate thickness direction. In the arranging step, the auxiliary member 10 is arranged on the surface 2b of the second metal member 2 only on one side with respect to the bonding reference line X, and the auxiliary member 10 is positioned at a position where the side surface 10c of the auxiliary member 10 overlaps the bonding reference line X. 10 is arranged. Note that the joining reference line X is a position where the plastic fluid material does not flow out from the inner corners of the side surfaces 1b, 1c of the first metal member 1 and the back surface 2c of the second metal member 2 in the friction stirring step described later. What is necessary is just to set suitably.

As shown in FIG. 6, the friction stirring step inserts the rotation center axis C of the rotating tool F rotated to the right in a position overlapping the joining reference line X, and rotates the rotating tool F from the near side to the far side in FIG. Is a step of friction stir welding the butt portion J1. In the friction stirring step, as in the first embodiment, only the stirring pin F2 of the rotary tool F is brought into contact with the first metal member 1, the second metal member 2, and the auxiliary member 10, or the second metal member 2 and Friction stir welding is performed with the auxiliary member 10 in contact.

In the present embodiment, the auxiliary member 10 of the second metal member 2 is not disposed on the shear side of the rotating tool F (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). The moving direction and rotating direction of the rotary tool F are set so as to be on the side. The rotation direction and the traveling direction of the rotary tool F are not limited to those described above, and may be set as appropriate.

For example, when the rotational speed of the rotary tool F is slow, the shear side is more plastic fluid than the flow side (retreatingreside: the side where the moving speed of the rotary tool is subtracted from the tangential speed on the outer periphery of the rotary tool). Since the temperature tends to rise, many burrs V tend to be generated on the shear side outside the plasticized region W1. On the other hand, for example, when the rotational speed of the rotary tool F is fast, the temperature of the plastic fluidized material increases on the shear side, but a larger amount of burr V is generated on the flow side outside the plasticizing region W1 because the rotational speed is faster. There is a tendency.

In the present embodiment, since the rotational speed of the rotary tool F is set high, as shown in FIG. 7, many burrs V tend to be generated on the flow side outside the plasticized region W1. Further, by setting the rotation speed of the rotary tool F faster, the moving speed (feed speed) of the rotary tool F can be increased. Thereby, a joining cycle can be shortened.

In the friction stir process, the side where the burr V is generated in the traveling direction of the rotary tool F depends on the joining conditions. The joining conditions include the rotational speed, rotational direction, moving speed (feeding speed) of the rotary tool F, the inclination angle (taper angle) of the stirring pin F2, and the metal members to be joined (first metal member 1, second metal member 2). And the material of the auxiliary member 10), the thickness of the metal member to be joined, etc., and the combination of these elements. It is preferable to set the side where the burrs V are generated or the side where a large amount of burrs V is generated to be the auxiliary member 10 side according to the joining conditions because the removal step described later can be easily performed.

The removal step is a step of removing the auxiliary member 10 from the second metal member 2. In the removal step, the auxiliary member 10 is removed by being bent as in the first embodiment. Through the above steps, the first metal member 1 and the second metal member 2 are joined.

Also by the joining method according to the second embodiment described above, substantially the same effect as that of the first embodiment can be obtained. Further, in the arrangement process according to the second embodiment, the auxiliary member 10 is arranged on one side with respect to the joining reference line X, and in the friction stirring process, the joining conditions are set so that burrs V are generated on the auxiliary member 10 side. Thereby, the burr | flash V can be concentrated on the auxiliary member 10 arrange | positioned with respect to the joining reference line X at one side. Thereby, since the burr | flash V can be removed with the auxiliary member 10, the burr | flash V can be removed easily.

[Third embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. In the joining method according to the third embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The joining method according to the third embodiment will be described with a focus on the differences from the first embodiment.

In the butting process, as shown in FIG. 8, the butted portion J1 is formed by butting the end surface 1a of the first metal member 1 and the back surface 2c of the second metal member 2 as in the first embodiment. Also in this embodiment, the joining reference line X is set at a position overlapping the center of the first metal member 1 in the plate thickness direction. In the arranging step, the auxiliary member 10 is arranged on the surface 2b of the second metal member 2 on the other side with respect to the joining reference line X, while the side surface 10c of the auxiliary member 10 is slightly on one side with respect to the joining reference line X. The auxiliary member 10 is disposed so as to protrude. The thickness of the auxiliary member 10 and the distance from the joining reference line X to the side surface 10c are such that a metal shortage does not occur in the joining portion (plasticization region W1) in the friction stirring process described later, and one side after the friction stirring process. The auxiliary member 10 is appropriately set so as not to remain.

In the friction stirring step, as shown in FIG. 9, the rotation center axis C of the rotating tool F rotated counterclockwise is inserted at a position overlapping the joining reference line X, and the rotating tool F is moved from the near side to the far side in FIG. 9. Is a step of friction stir welding the butt portion J1. In the friction stirring step, as in the first embodiment, only the stirring pin F2 of the rotary tool F is brought into contact with the first metal member 1, the second metal member 2, and the auxiliary member 10, or the second metal member 2 and Friction stir welding is performed with the auxiliary member 10 in contact.

In this embodiment, since the rotary tool F is rotated counterclockwise at a high speed, burrs V tend to be formed on the flow side of the auxiliary member 10.

In the removing step, as shown in FIG. 10, the auxiliary member 10 is removed from the second metal member 2. In the removing step, the auxiliary member 10 is bent and the auxiliary member 10 is removed from the second metal member 2.

According to the joining method according to the third embodiment described above, it is possible to achieve substantially the same effect as that of the first embodiment. Further, according to the present embodiment, in the arranging step, the auxiliary member 10 is arranged on the other side with respect to the joining reference line X, and the side surface 10c of the auxiliary member 10 is slightly protruded on the one side. Further, in the friction stirring step, the auxiliary member 10 and the burr V do not remain on one side of the surface 2b of the second metal member 2 while the butt joint J1 is friction stir welded, and the burr V is generated on the auxiliary member 10 side. The joining conditions are set as follows. As a result, it is possible to prevent a shortage of metal in the joint portion (plasticization region W1) in a well-balanced manner and to collect the burrs V in the auxiliary member 10 disposed on the other side. Thereby, since the burr | flash V can be removed with the auxiliary member 10, the burr | flash V can be removed easily.

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.

[Fourth embodiment]
A joining method according to a fourth embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 11, 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 and joined. The joining method according to the present embodiment performs a butt process, a temporary joining process, and a main joining process.

The first metal member 1 is a plate-like metal member. The material of the first metal member 1 is appropriately selected from metals capable of friction stir such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like. The second metal member 2 is a plate-like metal member. The material of the second metal member 2 may be appropriately selected from the metals that can be frictionally stirred, but is preferably the same material as that of the first metal member 1. The plate thicknesses of the first metal member 1 and the second metal member 2 may be set as appropriate.

As shown in FIG. 11, the butting step is a step of butting the end surface 1a of the first metal member 1 and the back surface 2c of the second metal member 2 in a T-shaped cross section. The butt portion J1 is formed by the butt process.

The temporary joining step is a step of spot-joining the inner corners of the first metal member 1 and the second metal member 2 using a rotary tool (temporary joining rotary tool) F as shown in FIG.

In the temporary joining step, the first inner corner (inner corner) constituted by the side surface 1b of the first metal member 1 and the back surface 2c of the second metal member 2, and the side surface 1c of the first metal member 1 and the second metal member 2 are used. Is inserted into the second inner corner (inner corner) composed of the back surface 2c of the rotating tool F while inclining the rotation center axis thereof. In the temporary joining step, the friction stir welding is intermittently performed along the abutting portion J1 while the stirring pin F2 is inserted shallowly into the inner corner. The plasticized region W0 is intermittently formed by the temporary joining process.

Further, in the temporary joining step, a tab material temporary joining step is performed in which the tab material T is temporarily joined to the end surface on the one end side of the second metal member 2. The thickness of the tab material T is the same as the thickness of the second metal member 2. In the tab material temporary joining step, the back surface Tb of the tab material T and the back surface 2c of the second metal member 2 are flush with each other, and the surface Ta and the surface 2b of the second metal member 2 are flush with each other. In the tab material temporary joining step, the tab material T and the second metal member 2 are temporarily joined using the rotary tool F. In addition, you may provide the tab material T in the end surface of the other end side of the 2nd metal member 2 so that it may become the completion | finish position of the main joining process mentioned later.

The main joining step is a step of full-scale friction stir welding of the butt joint J1 using a rotating tool (rotating tool for main joining) F as shown in FIG. In the main joining step, the rotating tool F rotated to the right is inserted into the start position Sp set on the tab material T, and the rotating tool F is relatively moved along the abutting portion J1. A plasticizing region W1 is formed on the movement trajectory of the rotary tool F.

In this joining step, as shown in FIG. 14, the friction stir welding is performed in a state where the connecting portion F1 is separated from the second metal member 2, that is, the base end side of the stirring pin F2 is exposed. Further, in the present embodiment, the stirring pin F2 is arranged so that the tip of the stirring pin F2 reaches the first metal member 1, that is, the stirring pin F2, the first metal member 1, and the second metal member 2 are in contact with each other. Set the insertion depth.

The insertion depth of the stirring pin F2 may be set so that the stirring pin F2 contacts only the second metal member 2. In this case, the butt portion J1 is plastically fluidized and joined by frictional heat between the stirring pin F2 and the second metal member 2.

When the main joining process is completed, a burr removing process for removing burrs formed in the plasticized region W2 may be performed. Thereby, the surface 2b of the 2nd metal member 2 can be finished finely.

According to the bonding method according to the present embodiment described above, the first metal member 1 and the second metal member 2 are spot-temporarily bonded to each other in the temporary bonding step. And misalignment can be prevented. Thereby, joining accuracy can be raised. Moreover, since only the stirring pin F2 is inserted into each metal member in both the main joining step and the temporary joining step, the amount of heat input can be reduced, and the thermal strain of each metal member can be reduced. In particular, in the temporary bonding step, by performing spot temporary bonding, the amount of heat input can be reduced and the bonding time can also be shortened.

Moreover, since only the stirring pin F2 is inserted into each metal member in both the main joining process and the temporary joining process, the load applied to the friction stirrer can be reduced. Thereby, in the main joining step, the butted portion J1 located at a deep position can be joined. That is, since it can join even when the plate | board thickness of the 2nd metal member 2 is large, the freedom degree of design can be raised.

In addition, the temporary bonding rotary tool used in the temporary bonding process and the main bonding rotating tool used in the main bonding process may be different from each other, but by using the rotary tool F as in the present embodiment, There is no need to change the rotating tool in each process. Thereby, joining work can be performed efficiently.

Next, a joining method according to another embodiment of the present invention will be described. In another embodiment, a butt process, a temporary bonding process, and a main bonding process are performed. Since the butting process and the main bonding process according to other embodiments are common to the above-described embodiments, the description thereof is omitted.

In the temporary joining step according to another embodiment, although not specifically illustrated, spot temporary joining is performed by welding along an inner corner formed by the first metal member 1 and the second metal member 2. In the temporary joining process, the first inner corner (inner corner) and the first metal member constituted by the side surface 1b of the first metal member 1 and the back surface 2c of the second metal member 2 by TIG welding, MIG welding, laser welding or the like. Welding is intermittently performed at a second inner corner (inner corner) constituted by the side surface 1c of the first metal and the back surface 2c of the second metal member 2.

Other embodiments can achieve substantially the same effects as the above-described embodiments. In particular, in the temporary joining step, by performing spot temporary joining by welding, thermal distortion of each metal member can be prevented and temporary joining can be performed in a short time.

Although the embodiment of the present invention described above has been described, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in this embodiment, the metal members are joined so as to have a T-shaped cross section, but may be joined so as to have a substantially L-shaped cross section.

[Fifth embodiment]
A joining method according to a fifth embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 15, in the joining method according to this embodiment, the first metal member 101 and the second metal member 102 are butted in a T shape and joined. The joining method according to the present embodiment performs a butting step, an auxiliary member arranging step, an inner corner friction stirring step, an auxiliary member removing step, and a butting portion friction stirring step.

The first metal member 101 is a plate-like metal member. The material of the first metal member 101 is appropriately selected from metals capable of friction stir such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium alloy, magnesium alloy and the like. On the back surface 101a of the first metal member 101, a concave groove 103 having a rectangular cross section including a bottom surface 103a and

side walls

103b and 103b is formed. The concave groove 103 is extended in the extending direction of the first metal member 101. The second metal member 102 is a plate-like metal member. The plate thickness dimension of the second metal member 102 is set to be equal to or smaller than the width of the concave groove 103 so that the second metal member 102 fits into the concave groove 103. The material of the second metal member 102 may be appropriately selected from the metals that can be frictionally stirred, but is preferably the same material as the first metal member 101.

As shown in FIG. 15, the butting process is a process in which the first metal member 101 and the second metal member 102 are butted in a T shape when viewed from the front. In the butting step, the second metal member 102 is fitted into the concave groove 103 of the first metal member 101, and the end surface 102 c of the second metal member 102 is butted against the bottom surface 103 a of the concave groove 103. The butted portion J11 (see FIG. 16) is formed by butting the bottom surface 103a of the concave groove 103 of the first metal member 101 and the end surface 102c of the second metal member 102. Further, on both sides of the second metal member 102, a first inner corner S11 (see FIG. 16) and a second inner corner S12 (see FIG. 16) are formed. The first inner corner S 11 is a corner formed by the back surface 101 a of the first metal member 101 and the side surface 102 a of the second metal member 102. The second inner corner S 12 is a corner composed of the back surface 101 a of the first metal member 101 and the side surface 102 b of the second metal member 102.

As shown in FIG. 16, the auxiliary member arranging step is a step of arranging

auxiliary members

111 and 112 at the first inner corner S11 and the second inner corner S12 formed by the first metal member 101 and the second metal member 102. is there. The

auxiliary members

111 and 112 are plate-like metal members. In this embodiment, the

auxiliary members

111 and 112 are made of the same material as the first metal member 101 and the second metal member 102.

In the auxiliary member arranging step, as shown in FIG. 16, the back surface 101a of the first metal member 101 and the front surface 111b of the auxiliary member 111 are brought into surface contact, and the end 111c is brought into contact with the side surface 102a of the second metal member 102. Let Further, the back surface 101 a of the first metal member 101 and the front surface 112 b of the auxiliary member 112 are brought into surface contact, and the end portion 112 c is brought into contact with the side surface 102 b of the second metal member 102. The shapes of the

end portions

111c and 112c of the

auxiliary members

111 and 112 are formed so as to abut on the

side surfaces

102a and 102b without a gap depending on the abutting angle (inner angle) between the first metal member 101 and the second metal member 102. It is good to be done. The

auxiliary members

111 and 112 are formed with a length that covers the extending direction of the butted portion J11. The plate thickness of the

auxiliary members

111 and 112 is set to such a thickness that metal shortage does not occur in the inner corner friction stirring process described later.

The inner corner friction stirring step is a step of friction stir welding the first inner corner S11 and the second inner corner S12 formed by the first metal member 101 and the second metal member 102 as shown in FIG. 17 shows only the friction stir welding on the first inner corner S11 side). In the friction stir welding on the first inner corner S11 side, as shown in FIG. 17, a rotating tool F is inserted into a portion where the side surface 102a of the second metal member 102 and the end portion 111c of the auxiliary member 111 abut. Do. In the friction stir welding on the second inner corner S12 side, the rotating tool F that rotates is inserted into a portion where the side surface 102b of the second metal member 102 and the end 112c of the auxiliary member 112 abut.

Rotating tool F is rotated clockwise in this embodiment, so that the spiral groove is formed counterclockwise from the proximal end toward the distal end.

In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise as it goes from the proximal end to the distal end. 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 to-be-joined metal member (The 1st metal member 101, the 2nd metal member 102, and the auxiliary members 111 and 112) can be decreased.

In the friction stir welding on the first inner corner S11 side, as shown in FIG. 17, the stirring pin F2 that is rotated clockwise to the portion where the side surface 102a of the second metal member 102 and the end 111c of the auxiliary member 111 abut is shallow. The rotary tool F is relatively moved along the first inner corner S11 from the near side to the far side in FIG. That is, in the friction stir welding on the first inner corner S11 side, only the stirring pin F2 contacts the first metal member 101, the second metal member 102, and the auxiliary member 111 with the proximal end side of the stirring pin F2 exposed. And friction stir. Thereby, a linear plasticized region W11 is formed in the movement locus of the rotary tool F.

On the other hand, in the friction stir welding on the second inner corner S12 side, the stirring pin F2 rotated clockwise is shallowly inserted into the portion where the side surface 102b of the second metal member 102 and the end 112c of the auxiliary member 112 abut, and FIG. The rotary tool F is relatively moved along the second inner corner S12 from the back side to the near side. That is, in the friction stir welding on the second inner corner S12 side, only the stirring pin F2 contacts the first metal member 101, the second metal member 102, and the auxiliary member 112 with the proximal end side of the stirring pin F2 exposed. And friction stir. Thereby, a linear plasticized region W12 (see FIG. 19) is formed in the movement locus of the rotary tool F.

In the inner corner friction stirring step, friction stir welding is performed in a state where the rotary tool F is inclined with respect to the second metal member 102 so that the connecting portion F1 does not interfere with the side surface 102a and the side surface 102b of the second metal member 102. . What is necessary is just to set suitably the insertion angle and insertion distance of the stirring pin F2 so that the 1st metal member 101 and the 2nd metal member 102 can be joined. In the present embodiment, the rotation center axis of the rotary tool F is inclined by 45 ° with respect to the vertical plane (

side surfaces

102a and 102b of the second metal member 102) (see FIG. 18).

Also, in the inner corner friction stirring step, it is preferable to set the joining conditions so that burrs are generated on the

auxiliary members

111 and 112 side.

In this embodiment, since the rotational speed of the rotary tool F is set high, in the friction stir welding on the first inner corner S11 side, many burrs V11 are generated in the auxiliary member 111 on the flow side outside the plasticizing region W11. (See FIG. 18). Although not shown, for the same reason as the friction stir welding on the first inner corner S11 side, the auxiliary member 112 on the flow side outside the plasticizing region W12 is also used in the friction stir welding on the second inner corner S12 side. Many burrs V12 tend to occur. The joining conditions of the rotary tool F and the arrangement positions of the

auxiliary members

111 and 112 are not limited to those described here, and may be set as appropriate.

In this way, if the joining conditions are set so that the side where the burrs V11, V12 are generated or the side where the burrs V11, V12 are generated is the

auxiliary members

111, 112 side, as shown in FIG. , 112 can be aggregated with burrs V11, V12. Therefore, it is preferable because a removal step described later can be easily performed. Further, by setting the rotation speed of the rotary tool F faster, the moving speed (feed speed) of the rotary tool F can be increased. Thereby, a joining cycle can be shortened.

As shown in FIG. 19, the auxiliary member removing step is a step of removing the

auxiliary members

111 and 112 from the first metal member 101 or the second metal member 102 (here, the auxiliary member 111 from the first metal member 101). , 112 will be described). In the removal process of the present embodiment, the end 111d of the auxiliary member 111 and the end 112d of the auxiliary member 112 are turned up in the direction of the thick arrow in FIG. 19 so that the boundary between the plasticized regions W11 and W12 is bent. Resect. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Since the burrs V11 and V12 are formed on the

auxiliary members

111 and 112, the burrs V11 and V12 are also removed together with the auxiliary members 111 and 112 (see FIG. 20). Therefore, the burrs V11 and V12 can be easily removed together with the

auxiliary members

111 and 112.

The abutting portion friction stirring step is a step of performing friction stir welding to the butting portion J11 as shown in FIGS. As shown in FIG. 21, in the butt portion friction stirring step, first, the first metal member 101 and the second metal member 102 are arranged on the

gantry

105, 105. More specifically, in the abutting portion friction stirring step, the second metal member 102 is inserted between the

bases

105 and 105 that are spaced apart, and the back surface 101 a of the first metal member 101 is brought into contact with the

bases

105 and 105. Let The

mounts

105 and 105 both present a rectangular parallelepiped.

Chamfered portions

105a and 105a are formed in portions of the

gantry

105 and 105 facing the first inner corner S11 and the second inner corner S12. The shape of the chamfered portion 105a may be appropriately formed so as not to contact the plasticized regions W11 and W12. In the present embodiment, the shape is a C chamfered shape.

The abutting portion friction stirring step is a step of inserting the rotating tool F from the surface 101b of the first metal member 101 and performing friction stir welding along the abutting portion J11 as shown in FIGS. The rotary tool F may be the same as that used in the inner corner friction stirring process, and is formed of, for example, tool steel, and includes a connecting portion F1 and a stirring pin F2. The stirring pin F2 is tapered, and the length of the stirring pin F2 is larger than the plate thickness of the portion where the concave groove 103 (see FIG. 15) of the first metal member 101 is formed.

In the abutting portion friction stirring step, only the rotated stirring pin F2 is inserted into the first metal member 101, and the first metal member 101 and the connecting portion F1 are moved while being separated from each other. In other words, the friction stir welding is performed by tracing the butt portion J11 with the base end portion of the stirring pin F2 exposed. A plasticized region W13 is formed in the movement path 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 abutting portion J11. That is, it is preferable to perform friction stir welding by bringing the rotary tool F into contact with the first metal member 101 and the second metal member 102. When the tip of the stirring pin F2 is set so as not to reach the abutting portion J11, that is, when the stirring pin F2 is brought into contact only with the first metal member 101, the frictional heat between the first metal member 101 and the stirring pin F2 As a result, the metal around the butt portion J11 is plastically fluidized so that the first metal member 101 and the second metal member 102 are joined. When the friction stirring process is completed, it is preferable to perform a burr removing process for removing burrs generated on the surface 101b of the first metal member 101. Thereby, as shown in FIG. 24, the surface 101b of the 1st metal member 101 can be finished finely.

In the auxiliary member arranging step, as shown in FIG. 16, the

auxiliary members

111 and 112 are arranged (sideways) so as to be laid on the first metal member 101 side of the first inner corner S11 and the second inner corner S12. However, at least one of the

auxiliary members

111 and 112 may be disposed (vertically placed) so as to stand against the second metal member 102 side. For example, as shown in FIG. 25, the side surface 102b of the second metal member 102 and the back surface 112a of the auxiliary member 112 are brought into surface contact, and the end 112c is brought into contact with the back surface 101a of the first metal member 101. Even in that case, in the inner corner friction stirring step, it is preferable to set the joining conditions so that burrs are generated on the

auxiliary members

111 and 112 side. By doing in this way, it becomes possible to perform friction stir welding on the 1st inner corner S11 and 2nd inner corner S12 on the same joining conditions, for example.

In the inner corner friction stirring step shown in FIG. 17, a tab material (not shown) is placed in close contact with the near side or the back side of the first metal member 101 and the second metal member 102, and the rotary tool F is placed on the tab material. Once inserted, the first inner corner S11 and the second inner corner S12 may be friction stir welded by moving relative to the first metal member 101 and the second metal member 102 in the inserted state. Similarly, in the butt portion friction stirring step shown in FIG. 22, a tab material (not shown) is placed in close contact with the near side or the back side of the first metal member 101 and the second metal member 102, and the rotary tool F is placed on the tab material. May be once inserted and then relatively moved toward the first metal member 101 and the second metal member 102 in the inserted state, and the butt joint J11 may be friction stir welded. The same applies when the rotary tool F is detached.

According to the joining method according to the present embodiment described above, the

auxiliary members

111 and 112 are disposed at the first inner corner S11 and the second inner corner S12, and the first inner corner S11 and the second inner corner S11 are interposed via the

auxiliary members

111 and 112. Friction stir welding of the two inner corners S12 is performed. Thereby, since the metal shortage of the first inner corner S11 and the second inner corner S12 can be eliminated by the

auxiliary members

111 and 112, it is possible to prevent poor bonding.

Further, according to the joining method according to the present embodiment, since the friction stir welding is performed on the first inner corner S11 and the second inner corner S12, the first metal member 101 and the second metal at the time of the abutting portion friction stirring step. Positional displacement and separation between the members 102 can be prevented. Thereby, generation | occurrence | production of the joining defect accompanying the position shift and separation | spacing of the 1st metal member 101 and the 2nd metal member 102 can be prevented.

Moreover, since the concave groove 103 is formed in the first metal member 101 of the present embodiment, the thickness of the portion of the first metal member 101 where the concave groove 103 is formed is greater than the thickness of the other portions. Is also thin. Therefore, in the butt portion friction agitation process of the present embodiment, the depth at which the agitation pin F2 is inserted can be reduced as compared with the case where the concave groove 103 is not formed, so that a large load is not applied to the friction agitation device. Friction stir welding of the butt portion J11 can be performed.

Further, in the inner corner friction agitation process of the present embodiment, since the joining conditions are set so that the burrs V are generated on the

auxiliary members

111 and 112 side, the burrs V11 and V12 can be collected on the

auxiliary members

111 and 112. . Therefore, the burrs V11 and V12 can be easily removed together with the

auxiliary members

111 and 112.

Further, in the abutting portion friction agitation process of the present embodiment, using the rotary tool F, only the agitation pin F2 is brought into contact with the first metal member 101 and the second metal member 102 (or only the first metal member 101). Since the friction stir welding is performed, 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 thickness of the first metal member 101 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 102 is thin.

In addition, the

pedestals

105 and 105 of the present embodiment have chamfered

portions

105a and 105a formed at portions facing the first inner corner S11 and the second inner corner S12. When the first metal member 101 and the second metal member 102 are arranged on the gantry 105, the plasticized regions W11 and W12 and the gantry 105 interfere with each other, and the first metal member 101 and the second metal member 102 are lifted from the gantry 105. However, according to this embodiment, it is possible to prevent the plasticized regions W11 and W12 and the gantry 105 from interfering with each other.

[Sixth embodiment]
Next, the joining method according to the sixth embodiment of the present invention will be described. As in the fifth embodiment, the joining method according to the sixth embodiment performs a butting step, an auxiliary member arranging step, an inner corner friction stirring step, an auxiliary member removing step, and a butt portion friction stirring step. . As shown in FIG. 26, the joining method according to the second embodiment is different from the fifth embodiment in that a rotating tool G is used in the butt portion friction stirring step. The other steps, the butting step, the auxiliary member arranging step, the inner corner friction stirring step, and the auxiliary member removing step, are the same as those in the fifth embodiment, and thus the description thereof is omitted.

The rotary tool G is made of, for example, tool steel, and includes a columnar shoulder portion G1 and a stirring pin G2 depending from the shoulder portion G1. A spiral groove is formed on the outer peripheral surface of the stirring pin G2. In the butt portion friction stirring step, the rotary tool G is moved along the butt portion J11 while being inserted into the surface 101b of the first metal member 101. In the abutting portion friction stirring step, the lower end surface of the shoulder portion G1 is pushed into the first metal member 101 by about several millimeters to perform friction stirring. The insertion depth of the stirring pin G2 is not particularly limited as long as the butted portion J11 can be friction stir welded, but it is preferable to set the tip of the stirring pin G2 so as to reach the butted portion J11 as shown in FIG. . That is, it is preferable to perform friction stir welding by bringing the rotary tool G into contact with the first metal member 101 and the second metal member 102.

When the tip of the stirring pin G2 is set so as not to reach the butting portion J11, that is, when the stirring pin G2 contacts only the first metal member 101, the frictional heat between the first metal member 101 and the stirring pin G2 As a result, the metal around the butt portion J11 is plastically fluidized so that the first metal member 101 and the second metal member 102 are joined. In addition, although the outer diameter (diameter) of the shoulder part G1 may be set suitably, it is good to form smaller than the width | variety of the ditch | groove 103 (refer FIG. 15).

According to the joining method according to the sixth embodiment described above, an effect substantially equivalent to that of the fifth embodiment can be obtained. Further, since the shoulder portion G1 is pushed into the surface 101b of the first metal member 101, the plastic fluidized material is pressed by the shoulder portion G1, and burrs can be reduced. Moreover, since the groove | channel which generate | occur | produces in the surface 101b by the plasticization area | region W13 can be made small if the pushing amount of the rotation tool G is made small, surface treatment etc. become easy and finishes the surface 101b of the 1st metal member 101 neatly. be able to. Further, since the outer diameter (diameter) of the shoulder portion G1 is formed smaller than the width of the concave groove 103, the material plastically fluidized by the stirring pin G2 of the rotary tool G is the first metal member 101 and the second metal member 102. Can be prevented from jumping out from the first inner corner S11 and the second inner corner S12.

[Seventh embodiment]
Next, the joining method according to the seventh embodiment of the present invention will be described. As in the fifth embodiment, the joining method according to the seventh embodiment performs a butting step, an auxiliary member arranging step, an inner corner friction stirring step, an auxiliary member removing step, and a butt portion friction stirring step. . In the joining method according to this embodiment, as shown in FIG. 27, the fifth embodiment is that the first metal member 121, the second metal member 122, and the third metal member 123 are joined in a T-shape when viewed from the front. Is different.

The first metal member 121 and the third metal member 123 are plate-like metal members. The material of the first metal member 121 and the third metal member 123 is appropriately selected from metals that can be frictionally stirred such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium alloy, and magnesium alloy. A corner on the back surface 121a side of the first metal member 121 is cut out in a rectangular shape in front view. That is, the back surface 121a of the first metal member 121 has a recess 121f composed of a bottom surface 121d and a side wall 121e. Moreover, the corner | angular part by the side of the back surface 123a of the 3rd metal member 123 is notched by the front view rectangular shape. That is, the back surface 123a of the third metal member 123 has a recess 123f composed of a bottom surface 123d and a side wall 123e. As will be described later, a concave groove 124 is formed by the concave portion 121f and the concave portion 123f by butting the first metal member 121 and the third metal member 123 together. In addition, it is preferable that the recessed part 121f and the recessed part 123f are equivalent dimensions. That is, it is preferable that the bottom surface 121d of the first metal member 121 and the bottom surface 123d of the third metal member 123 are flush with each other in a state where the first metal member 121 and the third metal member 123 are abutted.

The second metal member 122 is a plate-like metal member. The plate thickness dimension of the second metal member 122 is set to be equal to or smaller than the width of the groove 124 so that the second metal member 122 fits into the groove 124. The material of the second metal member 122 may be appropriately selected from the metals that can be frictionally stirred, but is preferably the same material as the first metal member 121 and the third metal member 123.

In the butting step, the first butted portion J21 is formed by butting the end surface 121c on the side where the recess 121f of the first metal member 121 is formed and the end surface 123c on the side where the recess 123f of the third metal member 123 is formed. In the state in which the first metal member 121 and the third metal member 123 are abutted with each other, the

back surfaces

121a and 123a (around the first abutting portion J21) of the first metal member 121 and the third metal member 123 are recessed grooves having a rectangular cross section. 124 is formed. The concave groove 124 extends in the extending direction of the first metal member 121 and the third metal member 123.

In the butting process, the end face 122c of the second metal member 122 is butted against the first butting part J21 to form the second butting part J22 (see FIG. 28). That is, the end surface 122c of the second metal member 122 is abutted against the groove 124 formed in the back surface 121a of the first metal member 121 and the back surface 123a of the third metal member 123. Thereby, the first inner corner S21 (see FIG. 28) and the second inner corner S22 (see FIG. 28) are formed on both sides of the second metal member 122. The first inner corner S 21 is a corner constituted by the back surface 121 a of the first metal member 121 and the side surface 122 a of the second metal member 122. The second inner corner S 22 is a corner formed by the back surface 123 a of the third metal member 123 and the side surface 122 b of the second metal member 122.

In the auxiliary member arranging step, as shown in FIG. 28, the first inner corner S21 of the first metal member 121 and the second metal member 122 and the second inner corner S22 of the third metal member 123 and the second metal member 122 are assisted. In this step, the

members

111 and 112 are disposed. The

auxiliary members

111 and 112 are plate-like metal members. In this embodiment, the

auxiliary members

111 and 112 are formed of the same material as the first metal member 121, the second metal member 122, and the third metal member 123.

In the auxiliary member arranging step, as shown in FIG. 28, the back surface 121a of the first metal member 121 and the front surface 111b of the auxiliary member 111 are brought into surface contact, and the end 111c is brought into contact with the side surface 122a of the second metal member 122. Let Further, the side surface 122 b of the second metal member 122 and the back surface 112 a of the auxiliary member 12 are brought into surface contact, and the end portion 112 c is brought into contact with the back surface 123 a of the third metal member 123. The shapes of the

end portions

111c and 112c of the

auxiliary members

111 and 112 are such that the side surface 122a and the back surface 123a are in accordance with the abutment angle (inner angle) of the first metal member 121, the second metal member 122, and the third metal member 123. It is good to form so that it may contact | abut with no gap. The

auxiliary members

111 and 112 are formed with a length that covers the extending direction of the second butting portion J22. The plate thickness of the

auxiliary members

111 and 112 is set to such a thickness that metal shortage does not occur in the inner corner friction stirring process described later. As in the fifth embodiment, the auxiliary member 112 may be disposed (sideways) so as to lie on the third metal member 123 side of the second inner corner S22, or the first inner corner S21. You may arrange | position (vertically set) so that the auxiliary member 111 may lean against the 2nd metal member 122 side.

In the inner corner friction stirring step, as shown in FIG. 29, the first inner corner S21 and the second inner corner S22 formed by the first metal member 121, the second metal member 122, and the third metal member 123 are friction stir welded. (In FIG. 29, only the friction stir welding on the first inner corner S21 side is shown in FIG. 29). In the friction stir welding on the first inner corner S21 side, as shown in FIG. 29, a rotating tool F is inserted into a portion where the side surface 122a of the second metal member 122 and the end 111c of the auxiliary member 111 abut. Do. In the friction stir welding on the second inner corner S22 side, the rotating tool F that rotates is inserted into a portion where the back surface 123a of the third metal member 123 and the end 112c of the auxiliary member 112 abut.

In the friction stir welding on the first inner corner S21 side, as shown in FIG. 29, the stirring pin F2 that is rotated clockwise to the portion where the side surface 122a of the second metal member 122 abuts the end 111c of the auxiliary member 111 is shallow. The rotary tool F is inserted and relatively moved along the first inner corner S21 from the near side to the far side in FIG. That is, in the friction stir welding on the first inner corner S21 side, only the stirring pin F2 contacts the first metal member 121, the second metal member 122, and the auxiliary member 111 with the proximal end side of the stirring pin F2 exposed. And friction stir. Thereby, a linear plasticized region W21 is formed in the movement locus of the rotary tool F.

On the other hand, in the friction stir welding on the second inner corner S22 side, the agitating pin F2 rotated clockwise is shallowly inserted into the portion where the back surface 123a of the third metal member 123 and the end 112c of the auxiliary member 112 abut, and FIG. The rotary tool F is relatively moved along the second inner corner S22 from the near side to the far side. That is, in the friction stir welding on the second inner corner S22 side, only the stirring pin F2 contacts the second metal member 122, the third metal member 123, and the auxiliary member 112 with the proximal end side of the stirring pin F2 exposed. And friction stir. As a result, a linear plasticized region W22 (see FIG. 31) is formed on the movement locus of the rotary tool F.

In the inner corner friction stirring step, friction stir welding is performed in a state where the rotary tool F is inclined with respect to the second metal member 122 so that the connecting portion F1 does not interfere with the side surface 122a and the side surface 122b of the second metal member 122. . What is necessary is just to set suitably the insertion angle and insertion distance of the stirring pin F2 so that the 1st metal member 121, the 2nd metal member 122, and the 3rd metal member 123 can be joined. In the present embodiment, the rotation center axis of the rotary tool F is inclined by 45 ° with respect to the vertical plane (

side surfaces

122a and 122b of the second metal member 122) (see FIG. 30).

auxiliary members

111 and 112 side.

In this embodiment, since the rotational speed of the rotary tool F is set high, in the friction stir welding on the first inner corner S21 side, many burrs V21 are generated in the auxiliary member 111 on the flow side outside the plasticizing region W21. (See FIG. 30). Although not shown, for the same reason as the friction stir welding on the first inner corner S21 side, in the friction stir welding on the second inner corner S22 side, the auxiliary member 112 on the flow side outside the plasticizing region W22 is attached to the auxiliary member 112. Many burrs V22 tend to occur. The joining conditions of the rotary tool F and the arrangement positions of the

auxiliary members

In this way, if the joining condition is set so that the side where the burrs V21, V22 are generated or the side where the burrs V21, V22 are generated is the

auxiliary members

111, 112 side, as shown in FIG. , 112 can be combined with burrs V21, V22. Therefore, it is preferable because a removal step described later can be easily performed. Further, by setting the rotation speed of the rotary tool F faster, the moving speed (feed speed) of the rotary tool F can be increased. Thereby, a joining cycle can be shortened.

The auxiliary member removing step is a step of removing the

auxiliary members

111 and 112 from the first metal member 121, the second metal member 122, or the third metal member 123, as shown in FIG. The case where the auxiliary member 111 is removed from the member 121 and the auxiliary member 112 is removed from the second metal member 122 will be described). In the removing process of the present embodiment, the end 111d of the auxiliary member 111 and the end 112d of the auxiliary member 112 are turned up in the direction of the thick arrow in FIG. 31 so that the boundary between the plasticized regions W21 and W22 is bent. Resect. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Since the burrs V21 and V22 are formed on the

auxiliary members

111 and 112, the burrs V21 and V22 are also removed together with the auxiliary members 111 and 112 (see FIG. 32). Therefore, the burrs V21 and V22 can be easily removed together with the

auxiliary members

111 and 112.

The abutting portion friction stirring step is a step of performing friction stir welding on the first butting portion J21 and the second butting portion J22 as shown in FIGS. As shown in FIG. 33, first, the first metal member 121, the second metal member 122, and the third metal member 123 are arranged on the

gantry

105, 105 in the same manner as the fifth embodiment. More specifically, in the abutting portion friction stirring step, the second metal member 122 is inserted between the

gantry

105 and 105 that are spaced apart from each other, and the back surface 121a of the first metal member 121 and the third metal member 122 are inserted into the

gantry

105 and 105. The back surface 123a of the metal member 123 is brought into contact. The

mounts

105 and 105 both present a rectangular parallelepiped.

Chamfered portions

105a and 105a are formed in portions of the

gantry

105 and 105 facing the first inner corner S21 and the second inner corner S22. The shape of the chamfered portion 105a may be appropriately formed so as not to contact the plasticized regions W21 and W22. In the present embodiment, the shape is a C chamfered shape.

As shown in FIGS. 34 and 35, the abutting portion friction agitation step inserts the rotating tool F from the surface 121b of the first metal member 121 and the surface 123b of the third metal member 123, and follows the first abutting portion J21. This is a step of friction stir welding. The rotary tool F may be the same as that used in the inner corner friction stirring process, and is formed of, for example, tool steel, and includes a connecting portion F1 and a stirring pin F2. The stirring pin F2 is tapered, and the length of the stirring pin F2 is the portion where the concave groove 124 (see FIG. 27) formed by the first metal member 121 and the third metal member 123 is formed. It is larger than the plate thickness.

In the butt portion friction stirring step, only the rotated stirring pin F2 is inserted into the first butt portion J21 formed by the first metal member 121 and the third metal member 123, and the first metal member 121 and the third metal member 123 It is moved while being separated from the connecting portion F1. In other words, the friction stir welding is performed by tracing the first abutting portion J21 with the base end portion of the stirring pin F2 exposed. A plasticized region W23 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 second butting portion J22. That is, it is preferable to perform friction stir welding by bringing the rotary tool F into contact with the first metal member 121, the second metal member 122, and the third metal member 123. When setting so that the tip of the stirring pin F2 does not reach the second butting portion J22, that is, when the stirring pin F2 is brought into contact with only the first metal member 121 and the third metal member 123, the first metal member 121 is used. The metal around the second butted portion J22 is plastically fluidized by frictional heat between the third metal member 123 and the stirring pin F2, and the first metal member 121, the second metal member 122, and the third metal member 123 are joined. To. When the friction stirring step is completed, it is preferable to perform a burr removing step of removing burrs generated on the

surfaces

121b and 123b of the first metal member 121 and the third metal member 123. Thereby, the

surface

121b, 123b of the 1st metal member 121 and the 3rd metal member 123 can be finished finely.

In the inner corner friction stirring step shown in FIG. 29, a tab material (not shown) is arranged in close contact with the front side or the back side of the first metal member 121, the second metal member 122, and the third metal member 123. After inserting the rotary tool F into the material, the first inner corner S21 and the second inner corner are moved relative to the first metal member 121, the second metal member 122, and the third metal member 123 while being inserted. S22 may be friction stir welded. Similarly, in the butt portion friction stirring step shown in FIG. 34, a tab material (not shown) is placed in close contact with the front side or the back side of the first metal member 121, the second metal member 122, and the third metal member 123, Once the rotary tool F is inserted into the tab material, it is moved relative to the first metal member 121, the second metal member 122, and the third metal member 123 in the inserted state, and the first butted portion J21 and the second butted portion. Part J22 may be friction stir welded. The same applies when the rotary tool F is detached.

Moreover, you may perform the butt | part friction friction stirring process of 7th embodiment using the rotation tool G (refer FIG. 26) demonstrated in 6th embodiment. In that case, in the butt portion friction stirring step, the lower end surface of the shoulder portion G1 is pushed into the first metal member 121 and the third metal member 123 by several millimeters to perform friction stirring. The insertion depth of the stirring pin G2 is not particularly limited as long as the first butting portion J21 and the second butting portion J22 can be friction stir welded, but is set so that the tip of the stirring pin G2 reaches the second butting portion J22. It is preferable. That is, it is preferable to perform friction stir welding by bringing the rotary tool G into contact with the first metal member 121, the second metal member 122, and the third metal member 123.

According to the joining method according to the seventh embodiment described above, the

auxiliary members

111 and 112 are arranged in the first inner corner S21 and the second inner corner S22, and the first inner corner S21, Friction stir welding of the second inner corner S22 is performed. Thereby, since the metal shortage of the first inner corner S21 and the second inner corner S22 can be solved by the

auxiliary members

111 and 112, it is possible to prevent poor bonding.

Further, according to the joining method according to the present embodiment, since the friction stir welding is performed on the first inner corner S21 and the second inner corner S22, the first metal member 121 and the second metal in the butt portion friction stirring step Misalignment and separation of the members 122 and the third metal member 123 and the second metal member 122 can be prevented. Thereby, it is possible to prevent the occurrence of poor bonding due to the positional deviation or separation of the first metal member 121, the second metal member 122, and the third metal member 123.

Further, the first metal member 121 of the present embodiment is formed with a recess 121f that constitutes the groove 124, and the third metal member 123 is formed with a recess 123f that constitutes the groove 124, The plate thickness of the portion where the recess 121f of the first metal member 121 and the recess 123f of the third metal member 123 are formed is thinner than the plate thickness of the other portions. Therefore, in the friction stir process of the present embodiment, the depth at which the stir pin F2 is inserted can be reduced as compared with the case where the concave groove 124 is not formed, so that a large load is not applied to the friction stirrer. Friction stir welding of the butt J21 and the second butt J22 can be performed.

Further, in the inner corner friction agitation process of the present embodiment, since the joining conditions are set so that burrs V are generated on the

auxiliary members

111 and 112 side, the burrs V21 and V22 can be collected on the

auxiliary members

111 and 112. . Therefore, the burrs V21 and V22 can be easily removed together with the

auxiliary members

111 and 112.

Further, in the abutting portion friction agitation process of the present embodiment, using the rotary tool F, only the agitation pin F2 is attached to the first metal member 121, the second metal member 122, and the third metal member 123 (or the first metal member 121 and Since the friction stir welding is performed in a state where it is in contact with only the third metal member 123), 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 121 and the third metal member 123 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 122 is thin.

In addition, the

pedestals

105 and 105 of the present embodiment have chamfered

portions

105a and 105a formed at portions facing the first inner corner S21 and the second inner corner S22. When the first metal member 121, the second metal member 122, and the third metal member 123 are disposed on the gantry 105, the plasticized regions W21 and W22 interfere with the gantry 105, and the first metal member 121 and the second metal member. Although 122 and the third metal member 123 may be lifted from the gantry 105, according to the present embodiment, it is possible to prevent the plasticized regions W21 and W22 and the gantry 105 from interfering with each other.

[Eighth embodiment]
The joining method according to the eighth embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 36, in the joining method according to the present embodiment, the first metal member 201 and the second metal member 202 are butted in a T shape in front view and joined by friction stirring. In the joining method according to the present embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed.

Both the first metal member 201 and the second metal member 202 have a plate shape. The first metal member 201 and the second metal member 202 are appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. The plate thickness dimensions of the first metal member 201 and the second metal member 202 may be set as appropriate. On the back surface 202c of the second metal member 202, a concave groove 202d that opens to the first metal member 201 side is formed. The recessed groove 202d has a rectangular cross section corresponding to the shape of the first metal member 201. The groove width of the recessed groove 202d is formed to be equal to the plate thickness of the first metal member 201 in this embodiment. The recessed groove 202d is formed so that one end edge of the first metal member 201 can be fitted.

36, as shown in FIG. 36, the end surface 201a of the first metal member 201 is inserted into the concave groove 202d of the second metal member 202, the end surface 201a is butted against the bottom surface 202e of the concave groove 202d, and the butted portion J41 is formed. It is a process of forming. In the butting process according to the present embodiment, the groove width of the concave groove 202d is formed to be equal to the plate thickness of the first metal member 201, so that the side surfaces 201b and 201c in the plate thickness direction of the first metal member 201 and the concave groove The side surfaces 202f and 202g in the groove width direction of 202d are in contact with each other, and one end edge of the first metal member 201 is fitted into the concave groove 202d.

The placement step is a step of placing the auxiliary member 210 as shown in FIG. The auxiliary member 210 is a plate-shaped metal member. The plate thickness of the auxiliary member 210 is set to such a thickness that metal shortage does not occur in the joint portion (plasticization region W41) formed in the friction stirring step described later. In the present embodiment, the auxiliary member 210 is formed of the same material as the first metal member 201 and the second metal member 202. In the arranging step, the auxiliary member 210 is arranged at a position corresponding to the first metal member 201 and the concave groove 202d on the surface 202b of the second metal member 202. The front surface 202b of the second metal member 202 and the back surface 210b of the auxiliary member 210 are in surface contact. In the arrangement process according to the present embodiment, the central portion of the auxiliary member 210 and the center of the first metal member 201 in the plate thickness direction are arranged at substantially overlapping positions.

37, the friction stirring step is a step of inserting the rotating tool F rotating from the surface 210a side of the auxiliary member 210 and friction-stir-joining the butt J41. In the present embodiment, in order to rotate the rotary tool F to the right, the spiral groove is formed in a counterclockwise direction from the proximal end toward the distal end.

Thereby, it is possible to reduce the amount of metal overflowing to the outside of the metal members to be joined (the first metal member 201, the second metal member 202, and the auxiliary member 210).

In the friction stirring process, the stirring pin F2 rotated right from the surface 210a of the auxiliary member 210 is inserted. In the friction stirring step, the rotating tool along the abutting portion J41 from the near side to the far side in FIG. 37 with the stirring pin F2, the first metal member 201, the second metal member 202, and the auxiliary member 210 in contact with each other. Move F relatively. In the friction stirring step, friction stirring is performed with the base end side of the stirring pin F2 exposed. The rotation center axis C of the rotary tool F is set to a position passing through the center of the first metal member 201 in the plate thickness direction and the center of the groove 202d in the groove width direction. A plasticizing region W41 is formed in the movement locus of the rotary tool F. The insertion depth of the stirring pin F 2 may be set as appropriate, but in the present embodiment, the stirring pin F 2 is set so as to contact the first metal member 201.

In the friction stirring step, only the stirring pin F2 may be brought into contact with the second metal member 202 and the auxiliary member 210 to perform the friction stir welding. In this case, the butt portion J41 is plastically fluidized and joined by frictional heat between the second metal member 202 and the stirring pin F2. A burr V41 is formed on the surface 210a of the auxiliary member 210.

The removal step is a step of removing the auxiliary member 210 from the second metal member 202 as shown in FIG. In the removing step, the auxiliary member 210 is cut off while turning up both ends of the auxiliary member 210 so as to bend at the groove D. The concave groove D is a portion that is deeply grooved in the plasticized region W41. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Through the above steps, the first metal member 201 and the second metal member 202 are joined in a T-shape when viewed from the front.

According to the joining method according to the present embodiment described above, only the stirring pin F2 is brought into contact with the first metal member 201, the second metal member 202 and the auxiliary member 210, or the second metal member 202 and the auxiliary member 210. Since the friction stir welding is performed in the above state, the load on the friction stirrer can be reduced as compared with the prior art. Thereby, even if the plate | board thickness of the 2nd metal member 202 is large, the butt | matching part J41 in a deep position can be joined in the state which does not apply a big load to a friction stirring apparatus.

Moreover, since only the stirring pin F2 is inserted, the width of the plasticizing region W41 can be reduced. Thereby, since the plate | board thickness of the 1st metal member 201 can also be made small, the freedom degree of design of the 1st metal member 201 can be raised. Further, in addition to the first metal member 201 and the second metal member 202, the auxiliary member 210 is also friction stir welded to prevent metal shortage at the joint (plasticized region W41) as shown in FIG. .

Further, the end surface 201a of the first metal member 201 is inserted into the concave groove 202d of the second metal member 202 and the end surface 201a is abutted against the bottom surface 202e of the concave groove 202d. A positional deviation from the metal member 202 can be prevented.

Further, according to the removing step, since the burr V41 can be removed together with the auxiliary member 210, the surface 202b of the second metal member 202 can be finished finely without performing a separate burr removing operation. Moreover, in the friction stirring process of this embodiment, since the rotation tool F is inserted from the center part of the surface 210a of the auxiliary member 210, the insertion work of the rotation tool F can be performed easily.

[Ninth embodiment]
Next, the joining method according to the ninth embodiment of the present invention will be described. In the joining method according to the present embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. In the joining method according to the present embodiment, the arrangement position of the auxiliary member 210 is different from that of the eighth embodiment. In the joining method according to the present embodiment, a description will be given focusing on portions that are different from the eighth embodiment.

In the butting step, as shown in FIG. 40, as in the eighth embodiment, the end surface 201a of the first metal member 201 is inserted into the concave groove 202d of the second metal member 202, and the end surface 201a is used as the bottom surface 202e of the concave groove 202d. Butt portion J41 is formed.

Here, as shown in FIG. 40, a planned position through which the rotation center axis C (see FIG. 41) of the rotary tool F passes is set as a “joining reference line X” during the friction stirring step. In this embodiment, the joining reference line X is set so as to overlap the center in the plate thickness direction of the first metal member 201 and the center in the groove width direction of the concave groove 202d. In the arranging step, the auxiliary member 210 is arranged on the surface 202b of the second metal member 202 only on one side with respect to the joining reference line X, and the auxiliary member 210 is placed at a position where the side surface 210c of the auxiliary member 210 overlaps the joining reference line X. 210 is arranged. In addition, the joining reference line X is a position where the plastic fluid material does not flow out from the inner corners of the side surfaces 201b and 201c of the first metal member 201 and the back surface 202c of the second metal member 202 in the friction stirring step described later. What is necessary is just to set suitably.

As shown in FIG. 41, the friction stirrer step inserts the rotation center axis C of the rotating tool F rotated to the right in a position overlapping the joining reference line X, and rotates the rotating tool F from the near side to the far side in FIG. Is a step of friction stir welding the butt portion J41 by relatively moving. In the friction stirring step, as in the eighth embodiment, only the stirring pin F2 of the rotary tool F is brought into contact with the first metal member 201, the second metal member 202, and the auxiliary member 210, or the second metal member 202 and Friction stir welding is performed in a state where the auxiliary member 210 is in contact with the auxiliary member 210.

In the present embodiment, the auxiliary member 210 of the second metal member 202 is not arranged on the shear side of the rotary tool F (advancing side: the side on which the moving speed of the rotary tool is added to the tangential speed on the outer periphery of the rotary tool). The moving direction and rotating direction of the rotary tool F are set so as to be on the side. The rotation direction and the traveling direction of the rotary tool F are not limited to those described above, and may be set as appropriate.

In this embodiment, since the rotational speed of the rotary tool F is set high, as shown in FIG. 42, there is a tendency that many burrs V41 are generated on the flow side outside the plasticized region W41. Further, by setting the rotation speed of the rotary tool F faster, the moving speed (feed speed) of the rotary tool F can be increased. Thereby, a joining cycle can be shortened.

During the friction stirring process, on which side of the traveling direction of the rotary tool F the burr V41 is generated depends on the joining conditions. The joining conditions include the rotational speed of the rotary tool F, the rotational direction, the traveling direction, the moving speed (feeding speed), the inclination angle (taper angle) of the stirring pin F2, the metal member to be joined (the first metal member 201, the second It is determined by each element such as the material of the metal member 202 and the auxiliary member 210), the thickness of the metal member to be joined, and the combination of these elements. It is preferable to set the side where the burrs V41 are generated or the side where a large amount of burrs V41 are generated to be the auxiliary member 210 side according to the joining conditions because the removal process described later can be easily performed.

The removal step is a step of removing the auxiliary member 210 from the second metal member 202. In the removal step, the auxiliary member 210 is bent and removed as in the eighth embodiment. Through the above steps, the first metal member 201 and the second metal member 202 are joined.

Also by the joining method according to the ninth embodiment described above, substantially the same effect as that of the eighth embodiment can be achieved. In addition, in the arrangement process according to the ninth embodiment, the auxiliary member 210 is arranged on one side with respect to the joining reference line X, and in the friction stirring process, the joining condition is set so that the burr V is generated on the auxiliary member 210 side. Thereby, the burr | flash V41 can be collected on the auxiliary member 210 arrange | positioned with respect to the joining reference line X at one side. Accordingly, since the burr V41 can be removed together with the auxiliary member 210, the burr V41 can be easily removed.

[Tenth embodiment]
Next, the joining method according to the tenth embodiment of the present invention will be described. In the joining method according to the tenth embodiment, a butting process, an arranging process, a friction stirring process, and a removing process are performed. The joining method according to the tenth embodiment will be described with a focus on the differences from the eighth embodiment.

In the butting step, as shown in FIG. 43, as in the eighth embodiment, the end surface 201a of the first metal member 201 is inserted into the concave groove 202d of the second metal member 202, and the end surface 201a is inserted into the bottom surface 202e of the concave groove 202d. Butt portion J41 is formed. Also in the present embodiment, the joining reference line X is set at a position that overlaps the center of the first metal member 201 in the plate thickness direction and the center of the groove 202d in the groove width direction. In the arranging step, the auxiliary member 210 is arranged on the surface 202b of the second metal member 202 on the other side with respect to the joining reference line X, and the side surface 210c of the auxiliary member 210 is slightly on one side with respect to the joining reference line X. The auxiliary member 210 is disposed so as to protrude. The thickness of the auxiliary member 210 and the distance from the joining reference line X to the side surface 210c are such that a metal shortage does not occur in the joining portion (plasticization region W41) in the friction stirring process described later, and one side after the friction stirring process. The auxiliary member 210 is appropriately set so as not to remain.

In the friction stirring step, as shown in FIG. 44, the rotation center axis C of the rotating tool F rotated counterclockwise is inserted at a position overlapping the joining reference line X, and the rotating tool F is moved from the near side to the far side in FIG. Is a step of friction stir welding the butt portion J41 by relatively moving. In the friction stirring step, as in the eighth embodiment, only the stirring pin F2 of the rotary tool F is brought into contact with the first metal member 201, the second metal member 202, and the auxiliary member 210, or the second metal member 202 and Friction stir welding is performed in a state where the auxiliary member 210 is in contact with the auxiliary member 210.

In this embodiment, since the rotary tool F is rotated counterclockwise at high speed, the burr V41 tends to be formed on the flow side of the auxiliary member 210.

The removal step is a step of removing the auxiliary member 210 from the second metal member 202 as shown in FIG. In the removing step, the auxiliary member 210 is bent to remove the auxiliary member 210 from the second metal member 202.

According to the joining method according to the tenth embodiment described above, it is possible to achieve substantially the same effect as that of the eighth embodiment. Further, according to the present embodiment, in the arranging step, the auxiliary member 210 is arranged on the other side with respect to the joining reference line X, and the side surface 210c of the auxiliary member 210 is slightly protruded on the one side. In the friction stir process, the auxiliary member 210 and the burr V41 do not remain on one side of the surface 2b of the second metal member 202 and the burr V41 is generated on the auxiliary member 210 side while the butt joint J41 is friction stir welded. The joining conditions are set as follows. Thereby, the metal shortage of the joining portion (plasticization region W41) can be prevented in a well-balanced manner, and the burrs V41 can be concentrated on the auxiliary member 210 disposed on the other side. Accordingly, since the burr V41 can be removed together with the auxiliary member 210, the burr V41 can be easily removed.

[Eleventh embodiment]
Next, a joining method according to the eleventh embodiment of the present invention will be described. In the joining method according to the present embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. The joining method according to the present embodiment is different from the eighth embodiment in that the concave groove 205 is formed by the second metal member 203 and the third metal member 204. The joining method according to the eleventh embodiment will be described with a focus on differences from the eighth embodiment.

As shown in FIG. 46, the first metal member 201, the second metal member 203, and the third metal member 204 all have a plate shape. The first metal member 201, the second metal member 203, and the third metal member 204 are appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. . The plate thickness dimensions of the first metal member 201, the second metal member 203, and the third metal member 204 may be set as appropriate.

The second metal member 203 has an end surface 203c facing the third metal member 204, a surface 203a continuous with the end surface 203c and extending in a direction orthogonal to the end surface 203c, and extending in a direction orthogonal to the end surface 203c. It has a back surface 203b, and a first notch 203d formed by cutting out a corner formed by the back surface 203b and the end surface 203c. All the notches 203d are open to the first metal member 201 side and the third metal member 204 side. The first notch 203d has a first notch bottom surface 203e and a first notch side surface 203f. The first bottom surface 203e is continuous with the end surface 203c and extends in a direction orthogonal thereto. The first notch side surface 203f is formed between the first notch bottom surface 203e and the back surface 203b, and extends in a direction orthogonal to the first notch bottom surface 203e and the back surface 203b.

The third metal member 204 includes an end surface 204c facing the end surface 203c, a surface 204a that is continuous with the end surface 204c and extends in a direction orthogonal to the end surface 204c, and a back surface 204b that extends in a direction orthogonal to the end surface 204c. And a second cutout portion 204d formed by cutting out a corner portion constituted by the back surface 204b and the end surface 204c. The second notch 204d is open to the first metal member 201 side and the second metal member 203 side. The second cutout portion 204d has a second cutout bottom surface 204e and a second cutout side surface 204f. The second notch bottom surface 204e is continuous with the end surface 204c and extends in a direction orthogonal thereto. The second notch side surface 204f is formed between the second notch bottom surface 204e and the back surface 204b, and extends in a direction orthogonal to the second notch bottom surface 204e and the back surface 204b. All the notch parts 203d and the second notch part 204d are formed symmetrically with respect to the joining reference line X (in this embodiment, an extension line of the first abutting part J42).

The first notch 203d and the second notch 204d constitute a single groove 205 in a state where the end face 203c and the end face 204c are abutted. The first notch bottom surface 203e and the second notch bottom surface 204e constitute the bottom surface 205a of the groove 205. The first notch side surface 203f constitutes one side surface 205b of the concave groove 205, and the second notch side surface 204f constitutes the other side surface 205c of the concave groove 205. The recessed groove 205 opens to the first metal member 201 side. The concave groove 205 has a rectangular cross section corresponding to the shape of the first metal member 201. The groove width of the concave groove 205 is formed to be equal to the plate thickness of the first metal member 201 in this embodiment. The concave groove 205 is formed so that one end edge of the first metal member 201 can be fitted.

In the butting step, first, the end surface 203c of the second metal member 203 and the end surface 204c of the third metal member 204 are butted to form the first butting portion J42. When abutting in this manner, a single and rectangular recess groove 205 straddling the second metal member 203 and the third metal member 204 is formed by the first notch 203d and the second notch 204d. Next, the end surface 201a of the first metal member 201 is inserted into the concave groove 205 of the second metal member 203 and the third metal member 204, the end surface 201a is butted against the bottom surface 205a of the concave groove 205, and the second butted portion J43 ( 47). In the butting process according to the present embodiment, since the groove width of the groove 205 is formed to be equal to the plate thickness of the first metal member 201, the side surfaces 201b and 201c in the plate thickness direction of the first metal member 201 and the groove The side surfaces 205b and 205c in the groove width direction of 205 are in contact with each other, and one end edge of the first metal member 201 is fitted into the groove 205.

In the arranging step, the auxiliary member 210 is arranged so as to straddle the surface 203a of the second metal member 203 and the surface 204a of the third metal member 204. In this embodiment, the auxiliary member 210 is made of the same material as the first metal member 201, the second metal member 203, and the third metal member 204. Further, in the arranging step, the auxiliary member 10 is arranged at a position corresponding to the first metal member 201 and the groove 205 on the surface 203a of the second metal member 203 and the surface 204a of the third metal member 204. In the arrangement process according to the present embodiment, the central portion of the auxiliary member 210, the center of the first metal member 201 in the plate thickness direction, and the first butted portion J42 are arranged at substantially overlapping positions.

47, the friction stirring step is a step of inserting the rotating tool F rotating from the surface 210a side of the auxiliary member 210 and friction stir welding the first butting portion J42 and the second butting portion J43.

In the friction stirring process, the stirring pin F2 rotated right from the surface 210a of the auxiliary member 210 is inserted. In the friction stirring step, the first pin from the near side to the far side in FIG. 47 in the state where the stirring pin F2 and the first metal member 201, the second metal member 203, the third metal member 204, and the auxiliary member 210 are in contact with each other. The rotary tool F is relatively moved along the butting portion J42 and the second butting portion J43. In the friction stirring step, friction stirring is performed with the base end side of the stirring pin F2 exposed. The rotation center axis C of the rotary tool F is set to a position passing through the center of the first metal member 201 in the plate thickness direction, the center of the groove 205 in the groove width direction, and the first abutting portion J42. A plasticizing region W43 is formed in the movement locus of the rotary tool F. The insertion depth of the stirring pin F 2 may be set as appropriate, but in the present embodiment, the stirring pin F 2 is set so as to contact the first metal member 201.

In the friction stirring step, only the stirring pin F2 may be brought into contact with the second metal member 203, the third metal member 204, and the auxiliary member 210 to perform the friction stir welding. In this case, the second butted portion J43 is plastically fluidized and joined by frictional heat between the second metal member 203, the third metal member 204, and the stirring pin F2. A burr V42 is formed on the surface 210a of the auxiliary member 210.

The removal step is a step of removing the auxiliary member 210 from the second metal member 203 and the third metal member 204 as shown in FIG. In the removing step, the auxiliary member 210 is cut off while turning up both ends of the auxiliary member 210 so as to bend at the groove D. The concave groove D is a portion that is deeply buried in the plasticized region W43. In the removal process, a cutting tool or the like may be used, but in this embodiment, the removal process is performed manually. Through the above steps, as shown in FIG. 49, the first metal member 201, the second metal member 203, and the third metal member 204 are joined in a T shape when viewed from the front.

Also by the joining method according to the eleventh embodiment described above, substantially the same effect as that of the eighth embodiment can be obtained. That is, in order to insert the end surface 201a of the first metal member 201 into the concave groove 205 formed by abutting the second metal member 203 and the third metal member 204 and abut the end surface 201a with the bottom surface 205a of the concave groove 205, It is possible to prevent displacement of the first metal member 201, the second metal member 203, and the third metal member 204 during the butting process.

[Twelfth embodiment]
Next, a joining method according to the twelfth embodiment of the present invention will be described. In the joining method according to the twelfth embodiment, a butting process, an arranging process, a friction stirring process, and a removing process are performed. In the joining method according to the twelfth embodiment, the arrangement position of the auxiliary member 210 is different from that of the eleventh embodiment. The joining method according to the twelfth embodiment will be described with a focus on differences from the eleventh embodiment.

In the butting step, as shown in FIG. 50, the end surface 203c of the second metal member 203 and the end surface 204c of the third metal member 204 are butted together to form the first butting portion J42 as in the eleventh embodiment. When abutting in this manner, a single and rectangular recess groove 205 straddling the second metal member 203 and the third metal member 204 is formed by the first notch 203d and the second notch 204d. Next, the end surface 201a of the first metal member 201 is inserted into the recessed groove 205 of the second metal member 203 and the third metal member 204, the end surface 201a is butted against the bottom surface 205a of the recessed groove 205, and the second butted portion J43 is formed. Form.

Here, as shown in FIG. 50, the planned position through which the rotation center axis C of the rotary tool F (see FIG. 46) passes is set as a “joining reference line X” in the friction stirring step. In this embodiment, the joining reference line X is set so as to overlap the center of the first metal member 201 in the plate thickness direction, the center of the groove 205 in the groove width direction, and the first butted portion J42. In the arranging step, the auxiliary member 210 is arranged on the surface 204a of the third metal member 204 only on one side with respect to the first abutting portion J42, and the side surface 210c of the auxiliary member 210 is positioned so as to overlap the first abutting portion J42. An auxiliary member 210 is disposed. In the arranging step, the auxiliary member 210 may be arranged on the surface 203a of the second metal member 203 only on the other side with respect to the first abutting portion J42.
The friction stirring step and the removing step according to the present embodiment are performed by a method substantially similar to that of the ninth embodiment described above.

The bonding method according to the twelfth embodiment described above can provide substantially the same effect as that of the eleventh embodiment. That is, in order to insert the end surface 201a of the first metal member 201 into the concave groove 205 formed by abutting the second metal member 203 and the third metal member 204 and abut the end surface 201a with the bottom surface 205a of the concave groove 205, It is possible to prevent displacement of the first metal member 201, the second metal member 203, and the third metal member 204 during the butting process.
In addition, the joining method according to the twelfth embodiment can achieve substantially the same effect as the ninth embodiment. That is, in the disposing step according to the twelfth embodiment, the auxiliary member 210 is disposed on the surface 204a of the third metal member 204 on one side with respect to the first abutting portion J42, and the burr V42 is disposed on the auxiliary member 210 side in the friction stirring step. The joining conditions were set so that this occurred. Thereby, the burr | flash V42 can be concentrated on the auxiliary member 210 arrange | positioned on the one side with respect to the 1st butt | matching part J42. Thereby, since the burr | flash V42 can be removed with the auxiliary member 210, the burr | flash V42 can be removed easily.

[Thirteenth embodiment]
Next, a joining method according to the thirteenth embodiment of the present invention will be described. In the joining method according to the present embodiment, a butt process, an arrangement process, a friction stirring process, and a removal process are performed. In the joining method according to the thirteenth embodiment, the arrangement position of the auxiliary member 210 is different from that of the twelfth embodiment. The joining method according to the thirteenth embodiment will be described with a focus on the differences from the twelfth embodiment.

In the butting process, as shown in FIG. 51, the end face 203c of the second metal member 203 and the end face 204c of the third metal member 204 are butted together in the same manner as in the eleventh embodiment to form the first butting portion J42. When abutting in this manner, a single and rectangular recess groove 205 straddling the second metal member 203 and the third metal member 204 is formed by the first notch 203d and the second notch 204d. Next, the end surface 201a of the first metal member 201 is inserted into the recessed groove 205 of the second metal member 203 and the third metal member 204, the end surface 201a is butted against the bottom surface 205a of the recessed groove 205, and the second butted portion J43 is formed. Form. Also in this embodiment, the joining reference line X is set at a position where the center of the first metal member 201 in the plate thickness direction, the center of the groove 205 in the groove width direction, and the first butted portion J42 overlap.

In the arranging step, the auxiliary member 210 is arranged on the surface 203a of the second metal member 203 on the other side with respect to the first butting portion J42, and the side surface 210c of the auxiliary member 210 is on one side with respect to the first butting portion J42. The auxiliary member 210 is disposed so as to slightly protrude from the third metal member 204. The thickness of the auxiliary member 210 and the distance from the joining reference line X to the side surface 210c are such that there is no metal shortage in the joining portion (plasticization region W41) in the friction stirring process, and assistance is performed on one side after the friction stirring process. It sets suitably so that the member 210 may not remain | survive. In the arranging step, the auxiliary member 210 is arranged on the surface 204a of the third metal member 204 on one side with respect to the first abutting portion J42, while the side surface 210c of the auxiliary member 210 is on the other side with respect to the first abutting portion J42. The auxiliary member 210 may be disposed so as to slightly protrude from the second metal member 203 on the side.
The friction stirring step and the removing step according to the present embodiment are performed by a method substantially similar to that of the tenth embodiment described above.

The bonding method according to the thirteenth embodiment described above can provide substantially the same effect as that of the eleventh embodiment. That is, in order to insert the end surface 201a of the first metal member 201 into the concave groove 205 formed by abutting the second metal member 203 and the third metal member 204 and abut the end surface 201a with the bottom surface 205a of the concave groove 205, It is possible to prevent displacement of the first metal member 201, the second metal member 203, and the third metal member 204 during the butting process.
Also, the joining method according to the thirteenth embodiment can provide substantially the same effect as that of the tenth embodiment. That is, in the arrangement step, the auxiliary member 210 is disposed on the surface 204a of the third metal member 204 on one side while the auxiliary member 210 is disposed on the surface 203a of the second metal member 203 on the other side with respect to the first butting portion J42. The side surface 210c is slightly protruded. In the friction stirring step, the auxiliary member 210 and the burr V42 do not remain on the surface 204a of the third metal member 204 on one side while the first butting portion J42 and the second butting portion J43 are friction stir welded. The joining conditions are set so that the burr V42 is generated on the 210 side. Thereby, it is possible to prevent the metal shortage of the joint portion (plasticization region W42) in a well-balanced manner and to collect the burrs V42 on the auxiliary member 210 disposed on the other side. Thereby, since the burr | flash V42 can be removed with the auxiliary member 210, the burr | flash V42 can be removed easily.

[14th embodiment]
The joining method according to the fourteenth embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 52, in the joining method according to the present embodiment, the first metal member 301 and the second metal member 302 are butted in a T shape and joined. The joining method according to the present embodiment performs a butt process, a temporary joining process, and a main joining process.

The first metal member 301 is a plate-like metal member. The material of the first metal member 301 is appropriately selected from metals capable of friction stir, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. The second metal member 302 is a plate-like metal member. The material of the second metal member 302 may be appropriately selected from the metals that can be frictionally stirred, but is preferably the same material as the first metal member 301. The plate thicknesses of the first metal member 301 and the second metal member 302 may be set as appropriate. On the back surface 302 c of the second metal member 302, a concave groove 302 d that opens to the first metal member 301 side is formed. The concave groove 302 d has a rectangular cross section corresponding to the shape of the first metal member 301. The groove width of the recessed groove 302d is formed to be equal to the plate thickness of the first metal member 301 in this embodiment. The recessed groove 302d is formed so that one end edge of the first metal member 301 can be fitted.

52, as shown in FIG. 52, the end surface 301a of the first metal member 301 is inserted into the recessed groove 302d of the second metal member 302, the end surface 301a is butted against the bottom surface 302e of the recessed groove 302d, and the butted portion J51 is formed. It is a process of forming. In the butting process according to the present embodiment, the groove width of the concave groove 302d is formed to be equal to the plate thickness of the first metal member 301, and therefore the side surfaces 301b and 301c in the plate thickness direction of the first metal member 301 and the concave groove. The side surfaces 302f and 302g in the groove width direction of 302d are in contact with each other, and one end edge of the first metal member 301 is fitted into the concave groove 302d.

As shown in FIG. 53, the temporary bonding step is a step of temporarily bonding the inner corners of the first metal member 301 and the second metal member 302 using a rotary tool (temporary bonding rotary tool) F. In the present embodiment, in order to rotate the rotary tool F to the right, the spiral groove is formed in a counterclockwise direction from the proximal end toward the distal end.

In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise as it goes from the proximal end to the distal end. 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 to-be-joined metal member (the 1st metal member 301 and the 2nd metal member 302) can be decreased.

In the temporary joining step, the first inner corner (inner corner) composed of the side surface 301b of the first metal member 301 and the back surface 302c of the second metal member 302 and the side surface 301c of the first metal member 301 and the second metal member 302 are formed. Is inserted into the second inner corner (inner corner) composed of the back surface 302c of the rotating tool F while inclining the rotation center axis thereof. In the temporary joining step, friction stir welding is intermittently performed along the inner corner while the stirring pin F2 is inserted shallowly into the inner corner. By the temporary joining step, the plasticized region W51 is intermittently formed in a dot shape.

In the temporary bonding step, a tab material temporary bonding step is performed in which the tab material T is temporarily bonded to the end surface on one end side of the second metal member 302. The thickness of the tab material T is the same as the thickness of the second metal member 302. In the tab material temporary joining step, the back surface Tb of the tab material T and the back surface 302c of the second metal member 302 are flush with each other, and the surface Ta of the tab material T and the surface 302b of the second metal member 302 are flush with each other. To do. In the tab material temporary joining step, the tab material T and the second metal member 302 are temporarily joined using the rotary tool F. In addition, you may provide the tab material T in the end surface of the other end side of the 2nd metal member 302 so that it may become the completion | finish position of the main joining process mentioned later.

The main joining step is a step of full-scale friction stir welding of the butt joint J51 using a rotating tool (rotating tool for main joining) F as shown in FIG. In the main joining step, the rotating tool F rotated to the right is inserted into the start position Sp set on the tab material T, and the rotating tool F is relatively moved along the abutting portion J51. A plasticizing region W52 is formed in the movement trajectory of the rotary tool F.

In this joining step, as shown in FIG. 55, the friction stir welding is performed with the connecting portion F1 separated from the second metal member 302, that is, the base end side of the stirring pin F2 is exposed. Further, in the present embodiment, the stirring pin F2 is arranged so that the tip of the stirring pin F2 reaches the first metal member 301, that is, the stirring pin F2, the first metal member 301, and the second metal member 302 are in contact with each other. Set the insertion depth.

It should be noted that the insertion depth of the stirring pin F2 may be set so that the stirring pin F2 contacts only the second metal member 302. In this case, the butt portion J51 is plastically fluidized and joined by frictional heat between the stirring pin F2 and the second metal member 302.

When the main joining process is completed, a burr removing process for removing burrs formed in the plasticized region W52 may be performed. Thereby, the surface 302b of the 2nd metal member 302 can be finished finely.

According to the bonding method according to the present embodiment described above, the first metal member 301 and the second metal member 302 are spot-temporarily bonded to each other in the temporary bonding step. And misalignment can be prevented. Thereby, joining accuracy can be raised. Moreover, since only the stirring pin F2 is inserted into each metal member in both the main joining step and the temporary joining step, the amount of heat input can be reduced, and the thermal strain of each metal member can be reduced. In particular, in the temporary bonding step, by performing spot temporary bonding, the amount of heat input can be reduced and the bonding time can also be shortened.

Moreover, since only the stirring pin F2 is inserted into each metal member in both the main joining process and the temporary joining process, the load applied to the friction stirrer can be reduced. Thereby, in the main joining step, the butted portion J51 located at a deep position can be joined. That is, since the second metal member 302 can be joined even when the plate thickness is large, the degree of freedom in design can be increased.

Further, the end surface 301a of the first metal member 301 is inserted into the concave groove 302d of the second metal member 302 and the end surface 301a is butted against the bottom surface 302e of the concave groove 302d. The metal member 302 can be easily positioned.

Next, a joining method according to a modification of the fourteenth embodiment of the present invention will be described. In this modification, a butt process, a temporary bonding process, and a main bonding process are performed. Since the butting process and the main joining process according to the modification are common to the above-described fourteenth embodiment, the description thereof is omitted.

In the temporary joining step according to this modification, although not shown in the drawings, spot temporary joining is performed by welding along an inner corner formed by the first metal member 301 and the second metal member 302. In the temporary joining step, a first inner corner (inner corner) and a first metal member constituted by the side surface 301b of the first metal member 301 and the back surface 302c of the second metal member 302 by TIG welding, MIG welding, laser welding, or the like. Welding is intermittently performed at a second inner corner (inner corner) formed by the side surface 301 c of 301 and the back surface 302 c of the second metal member 302.

This modification can also provide substantially the same effect as that of the fourteenth embodiment described above. In particular, in the temporary joining step, by performing spot temporary joining by welding, thermal distortion of each metal member can be prevented and temporary joining can be performed in a short time.

[Fifteenth embodiment]
Next, with reference to FIG.56 and FIG.57, the joining method which concerns on 15th embodiment of this invention is demonstrated. In the joining method according to the fifteenth embodiment, a butt process, a temporary joining process, and a main joining process are performed. The joining method according to the fifteenth embodiment is different from the fourteenth embodiment in that a concave groove 305 is formed by the second metal member 303 and the third metal member 304. The joining method according to the fifteenth embodiment will be described with a focus on differences from the fourteenth embodiment.

The first metal member 301 is a plate-like metal member. The material of the first metal member 301 is appropriately selected from metals capable of friction stir, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. The second metal member 303 and the third metal member 304 are plate-like metal members. The material of the second metal member 303 and the third metal member 304 may be appropriately selected from the metals that can be frictionally stirred, but is preferably the same material as that of the first metal member 301. The plate thicknesses of the first metal member 301, the second metal member 303, and the third metal member 304 may be set as appropriate.

The second metal member 303 has an end surface 303c facing the third metal member 304, a surface 303a continuous with the end surface 303c and extending in a direction orthogonal thereto, and extending in a direction orthogonal to the end surface 303c. It has a back surface 303b, and a first notch 303d formed by cutting out a corner formed by the back surface 303b and the end surface 303c. All the notches 303d are open to the first metal member 301 side and the third metal member 304 side. The first notch 303d has a first notch bottom surface 303e and a first notch side surface 303f. The first bottom surface 303e is continuous with the end surface 303c and extends in a direction orthogonal thereto. The first cut-away side surface 303f is formed between the first cut-out bottom surface 303e and the back surface 303b, and extends in a direction orthogonal to the first cut-out bottom surface 303e and the back surface 303b.

The third metal member 304 includes an end surface 304c facing the end surface 303c, a surface 304a continuous with the end surface 304c and extending in a direction orthogonal to the end surface 304c, and a back surface 304b extending in a direction orthogonal to the end surface 304c. , And a second cutout portion 304d formed by cutting out a corner portion constituted by the back surface 304b and the end surface 304c. The second notch 304d is open to the first metal member 301 side and the second metal member 303 side. The second notch 304d has a second notch bottom surface 304e and a second notch side surface 304f. The second notch bottom surface 304e is continuous with the end surface 304c and extends in a direction orthogonal thereto. The second notch side surface 304f is formed between the second notch bottom surface 304e and the back surface 304b, and extends in a direction orthogonal to the second notch bottom surface 304e and the back surface 304b. The first notch 303d and the second notch 304d are formed symmetrically with respect to the extension line of the first butting portion J52.

The first notch 303d and the second notch 304d constitute a single groove 305 in a state where the end face 303c and the end face 304c are abutted with each other. The first notch bottom surface 303e and the second notch bottom surface 304e constitute the bottom surface 305a of the concave groove 305. The first notch side surface 303f constitutes one side surface 305b of the concave groove 305, and the second notch side surface 304f constitutes the other side surface 305c of the concave groove 305. The concave groove 305 opens to the first metal member 301 side. The concave groove 305 has a rectangular cross section corresponding to the shape of the first metal member 301. The groove width of the concave groove 305 is formed to be equal to the plate thickness of the first metal member 301 in this embodiment. The recessed groove 305 is formed so that one end edge of the first metal member 301 can be fitted.

In the butting step, first, the end surface 303c of the second metal member 303 and the end surface 304c of the third metal member 304 are butted to form the first butting portion J52. When abutting in this manner, a single and rectangular recess groove 305 straddling the second metal member 303 and the third metal member 304 is formed by the first notch 303d and the second notch 304d. Next, the end surface 301a of the first metal member 301 is inserted into the groove 305 of the second metal member 303 and the third metal member 304, the end surface 301a is butted against the bottom surface 305a of the groove 305, and the second butted portion J53 is formed. Form (see FIG. 57). In the butting process according to the present embodiment, the groove width of the concave groove 305 is formed to be equal to the plate thickness of the first metal member 301, and therefore the side surfaces 301b and 301c in the plate thickness direction of the first metal member 301 and the concave groove. The side surfaces 305b and 305c in the groove width direction of 305 are in contact with each other, and one end edge of the first metal member 301 is fitted in the groove 305.

As shown in FIG. 57, the temporary joining step is performed by rotating the inner corners of the first metal member 301 and the second metal member 303 and the inner corners of the first metal member 301 and the third metal member 304 with a rotating tool (rotating for temporary joining). Tool) is a step of spot temporary joining using F.

In the temporary joining step, the first inner corner (inner corner) constituted by the side surface 301b of the first metal member 301 and the back surface 303b of the second metal member 303, and the side surface 301c of the first metal member 301 and the third metal member 304 are formed. The rotation tool F is inserted into the second inner corner (inner corner) composed of the back surface 304b while inclining the rotation center axis. In the temporary joining step, friction stir welding is intermittently performed along the inner corner while the stirring pin F2 is inserted shallowly into the inner corner. By the temporary joining step, the plasticized region W51 is intermittently formed in a dot shape.

In the temporary bonding step, a tab material temporary bonding step is performed in which the tab material T is temporarily bonded to the end surfaces on the one end side of the second metal member 303 and the third metal member 304. The thickness of the tab material T is the same as the thickness of the second metal member 303 and the third metal member 304. In the tab material temporary joining step, the back surface Tb of the tab material T, the back surface 303b of the second metal member 303, and the back surface 304b of the third metal member 304 are flush with each other, and the surface Ta of the tab material T and the second metal member The surface 303a of 303 and the surface 304a of the third metal member 304 are flush with each other. In the tab material temporary joining step, the tab material T and the second metal member 303 are temporarily joined using the rotary tool F, and the tab material T and the third metal member 304 are temporarily joined. In addition, you may provide the tab material T in the end surface of the other end side of the 2nd metal member 303 so that it may become the completion | finish position of the main joining process mentioned later.

Although the specific illustration of the main joining step is omitted, the first abutting portion J52 and the second abutting are performed using the rotary tool (rotary tool for main joining) F (see FIG. 54) as in the fourteenth embodiment. Part J53 is a step of full-scale friction stir welding. In the main joining step, the rotating tool F rotated to the right is inserted into the start position set on the tab material T, and the rotating tool F is relatively moved along the first butting portion J52 and the second butting portion J53. A plasticizing region W52 is formed in the movement trajectory of the rotary tool F.

In the main joining step, the friction stir welding is performed in a state where the connecting portion F1 is separated from the surface 203a of the second metal member 303 and the surface 304a of the third metal member 304, that is, the base end side of the stirring pin F2 is exposed. . Moreover, in this embodiment, the stirring pin F2 and the 1st metal member 301, the 2nd metal member 303, and the 3rd metal member 304 contact so that the front-end | tip of the stirring pin F2 may reach the 1st metal member 301. Thus, the insertion depth of the stirring pin F2 is set.

The insertion depth of the stirring pin F2 may be set so that the stirring pin F2 contacts only the second metal member 303 and the third metal member 304. In this case, the second butted portion J53 is plastically fluidized and joined by frictional heat between the stirring pin F2, the second metal member 303, and the third metal member 304.

When the main joining process is completed, a burr removing process for removing burrs formed in the plasticized region W52 may be performed. Thereby, the surface 303a of the 2nd metal member 303 and the surface 304a of the 3rd metal member 304 can be finished finely.

According to the fifteenth embodiment, substantially the same effect as that of the fourteenth embodiment can be obtained. In particular, in order to insert the end surface 301a of the first metal member 301 into the concave groove 305 formed by abutting the second metal member 303 and the third metal member 304 and abut the end surface 301a with the bottom surface 305a of the concave groove 305, The first metal member 301, the second metal member 303, and the third metal member 304 can be easily positioned during the butting process.

Next, a joining method according to a modification of the present invention will be described. In the modification, a butt process, a temporary bonding process, and a main bonding process are performed. Since the butting process and the main joining process according to the modification are common to the above-described fifteenth embodiment, the description thereof is omitted.

Although a specific illustration is omitted in the temporary joining step according to the modification, the inner corner constituted by the first metal member 301 and the second metal member 303 and the first metal member 301 and the third metal member 304 are included. Spot spot joining by welding is performed along the inner corner. In the temporary joining process, the first inner corner (inner corner) and the first metal member constituted by the side surface 301b of the first metal member 301 and the back surface 303b of the second metal member 303 by TIG welding, MIG welding, laser welding or the like. The second inner corner (inner corner) formed by the side surface 301c of the 301 and the back surface 304b of the third metal member 304 is intermittently welded.

Even in the modified example, substantially the same effect as that of the fifteenth embodiment can be obtained. In particular, in the temporary joining step, by performing spot temporary joining by welding, thermal distortion of each metal member can be prevented and temporary joining can be performed in a short time.

Although the embodiments and modifications of the present invention described above have been described, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in each embodiment and modification, the metal members are joined so as to have a T-shaped cross section, but may be joined so as to have a substantially L-shaped cross section.

DESCRIPTION OF SYMBOLS 1 1st metal member 2 2nd metal member 10 Auxiliary member F Rotary tool F1 Connection part F2 Stirring pin J1 Butt part W1 Plasticization area | region

Claims

A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A butting step of butting the end surface of the first metal member and the back surface of the second metal member to form a butting portion;
An arranging step of arranging an auxiliary member at a position corresponding to the first metal member of the surface of the second metal member;
The rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is inserted into the second metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member. A friction stir process in which the rotating tool is relatively moved in the contacted state to friction stir weld the butted portion.
The joining method according to claim 1, further comprising a removing step of removing the auxiliary member on which the burr is formed from the second metal member.
The joining method according to claim 1 or 2, wherein in the friction stirring step, the stirring pin is inserted into a central portion of the auxiliary member.
In the case of the friction stirring step, when the planned position through which the rotation center axis of the rotary tool passes is set as a joining reference line,
In the arrangement step, the auxiliary member is arranged only on one side with respect to the joining reference line,
The joining method according to claim 2, wherein in the friction stirring step, joining conditions are set so that the burrs are generated in the auxiliary member.
In the case of the friction stirring step, when the planned position through which the rotation center axis of the rotary tool passes is set as a joining reference line,
In the arrangement step and the friction stirring step, the auxiliary member is arranged so as to straddle the joining reference line,
Setting the position and joining conditions of the auxiliary member so that the burr is generated in the auxiliary member on one side with respect to the joining reference line, and the auxiliary member does not remain on the other side after the friction stirring step. The bonding method according to claim 2.
A butting step of butting the end surface of the plate-like first metal member and the back surface of the plate-like second metal member to form a butting portion;
A temporary bonding step of inserting only the stirring pin of the rotating rotary tool for temporary bonding into the inner corner constituted by the first metal member and the second metal member, and performing spot temporary bonding along the inner corner;
The rotating tool for main joining to rotate is inserted from the surface side of the second metal member, and only the stirring pin of the rotating tool for main joining is used for the second metal member, or the first metal member and the second metal. And a main joining step in which the abutting portion is friction stir welded by relatively moving the main welding rotary tool in a state of contact with both members.
The joining method according to claim 6, wherein the temporary joining rotary tool and the final joining rotational tool are the same.
A butting step of butting the end surface of the plate-like first metal member and the back surface of the plate-like second metal member to form a butting portion;
A temporary joining step of performing spot temporary joining by welding along an inner corner constituted by the first metal member and the second metal member;
The rotating tool for main joining to rotate is inserted from the surface side of the second metal member, and only the stirring pin of the rotating tool for main joining is used for the second metal member, or the first metal member and the second metal. And a main joining step in which the abutting portion is friction stir welded by relatively moving the main welding rotary tool in a state of contact with both members.
The joining method according to claim 8, wherein the welding is TIG welding, MIG welding, or laser welding.
A butting step of forming an abutting portion by inserting an end face of the plate-like second metal member into the concave groove of the first metal member having a plate-like shape and having a concave groove on the back surface and butting the end face against the bottom surface of the concave groove; ,
An auxiliary member arranging step of arranging an auxiliary member at an inner corner formed by the back surface of the first metal member and the side surface of the second metal member;
An inner corner friction stirring step of inserting a stirring pin of a rotating tool from the inner corner, relatively moving the rotating tool along the inner corner, and friction stir welding the inner corner;
An abutting portion friction agitation step of inserting a stirring pin of a rotating tool from the surface side of the first metal member, relatively moving the rotating tool along the concave groove, and friction agitating the abutting portion. ,
In the inner corner friction stirring step, in the state where only the stirring pin is in contact with the first metal member, the second metal member and the auxiliary member, the inner corner is friction stir welded,
In the butt portion friction stirring step, the butt portion is friction-stir welded in a state where the stirring pin is in contact with only the first metal member or both the first metal member and the second metal member. A characteristic joining method.
In the abutting part friction stirring step, only the stirring pin of the rotary tool is inserted from the surface of the first metal member, and only the stirring pin is only the first metal member, or the first metal member and the second metal. The joining method according to claim 10, wherein the butted portion is friction stir welded in a state where both of the members are brought into contact with each other.
In the abutting portion friction stirring step, the rotating tool includes a shoulder portion having a columnar shape and a stirring pin hanging from the shoulder portion, and the diameter of the shoulder portion is set smaller than the width of the concave groove. The joining method according to claim 10, characterized in that:
The joining method according to claim 10, further comprising a removing step of removing the auxiliary member formed with burrs from the first metal member or the second metal member.
14. The joining method according to claim 13, wherein, in the inner corner friction stirring step, a joining condition of the rotary tool is set so that burrs generated in the friction stir welding are formed on the auxiliary member.
A first butt having a concave groove by abutting the end surface of the first metal member having a plate shape and notching the corner portion on the back surface and the end surface of the third metal member having a plate shape and notched corner portion on the back surface side. A step of forming a second butted portion by inserting an end surface of a plate-like second metal member into the concave groove and abutting the end surface against the bottom surface of the concave groove,
An auxiliary member is disposed at an inner corner formed by the back surface of the first metal member and the side surface of the second metal member, and is formed by the back surface of the third metal member and the side surface of the second metal member. An auxiliary member arranging step of arranging an auxiliary member in the inner corner;
An inner corner friction stirring step of inserting a stirring pin of a rotating tool from the inner corner, relatively moving the rotating tool along the inner corner, and friction stir welding the inner corner;
A stirring pin of a rotary tool is inserted from the surface side of the first metal member and the surface side of the third metal member, and the rotary tool is relatively moved along the concave groove, so that the first butting portion and the first metal A butt portion friction stirring step for friction stir welding the two butt portions,
In the inner corner friction stirring step, the inner corner is rubbed with only the stirring pin in contact with either the first metal member or the third metal member, the second metal member, or the auxiliary member. Stir welding,
In the butt portion friction stirring step, the stirring pin is in contact with only the first metal member and the third metal member, or in contact with the first metal member, the third metal member, and the second metal member. A joining method comprising friction stir welding of the first butting portion and the second butting portion.
In the abutting portion friction stirring step, only the stirring pin of the rotating tool is inserted from the surfaces of the first metal member and the third metal member, and only the stirring pin is only the first metal member and the third metal member. Or the friction stir welding of the first butted portion and the second butted portion in contact with the first metal member, the third metal member and the second metal member. The joining method described in 1.
In the abutting portion friction stirring step, the rotating tool includes a shoulder portion having a columnar shape and a stirring pin hanging from the shoulder portion, and the diameter of the shoulder portion is set smaller than the width of the concave groove. The bonding method according to claim 15, characterized in that:
The joining method according to claim 15, further comprising a removing step of removing the auxiliary member on which the burr is formed from the first metal member, the second metal member, or the third metal member.
19. The joining method according to claim 18, wherein, in the inner corner friction stirring step, joining conditions of the rotary tool are set so that burrs generated in the friction stir welding are formed on the auxiliary member.
A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A butting step of inserting an end face of the first metal member into the recessed groove of the second metal member having a recessed groove on the back surface and butting the end face against the bottom surface of the recessed groove; and
An arranging step of arranging an auxiliary member at a position corresponding to the first metal member of the surface of the second metal member;
The rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin contacts the second metal member and the auxiliary member, or the first metal member, the second metal member, and the auxiliary member. A friction stir process in which the rotating tool is moved relative to each other in a state of being brought into friction stir welding.
21. The joining method according to claim 20, further comprising a removing step of removing the auxiliary member formed with burrs from the second metal member.
The joining method according to claim 20 or 21, wherein in the friction stirring step, the stirring pin is inserted into a central portion of the auxiliary member.
In the case of the friction stirring step, when the planned position through which the rotation center axis of the rotary tool passes is set as a joining reference line,
In the arrangement step, the auxiliary member is arranged only on one side with respect to the joining reference line,
The joining method according to claim 21, wherein in the friction stirring step, joining conditions are set so that the burrs are generated in the auxiliary member.
In the case of the friction stirring step, when the planned position through which the rotation center axis of the rotary tool passes is set as a joining reference line,
In the arrangement step and the friction stirring step, the auxiliary member is arranged to straddle the joining reference line,
Setting the position and joining conditions of the auxiliary member so that the burr is generated in the auxiliary member on one side with respect to the joining reference line, and the auxiliary member does not remain on the other side after the friction stirring step. The bonding method according to claim 21, wherein:
A joining method for joining the first metal member, the second metal member, and the third metal member using a rotary tool equipped with a stirring pin,
The end face of the second metal member having a plate shape and notched corners on the back surface and the end surface of the third metal member having a plate shape and notched corners on the back surface are abutted with each other to form a groove and a first groove. A butting step of forming a butting portion and inserting a plate-like end surface of the first metal member into the groove and butting the end surface against the bottom surface of the groove to form a second butting portion;
An arranging step of arranging an auxiliary member at a position corresponding to the first metal member among the surfaces of the second metal member and the third metal member;
Friction that inserts the stirring pin of the rotary tool from the surface side of the auxiliary member and relatively moves the rotary tool along the concave groove to friction stir weld the first butting portion and the second butting portion. A stirring step,
In the friction stirring step, only the stirring pin is applied to the second metal member, the third metal member, and the auxiliary member, or the second metal member, the third metal member, the first metal member, and the auxiliary member. The joining method, wherein the first butted portion and the second butted portion are friction stir welded in a contact state.
26. The joining method according to claim 25, further comprising a removing step of removing the auxiliary member formed with burrs from the second metal member and the third metal member.
27. The joining method according to claim 25 or claim 26, wherein in the friction stirring step, the stirring pin is inserted into a central portion of the auxiliary member.
In the arranging step, the auxiliary member is arranged only on one side with respect to the first butting portion,
27. The joining method according to claim 26, wherein in the friction stirring step, joining conditions are set so that the burrs are generated in the auxiliary member.
In the arrangement step and the friction stirring step, the auxiliary member is arranged so as to straddle the first abutting portion,
The position of the auxiliary member and the joining condition are set so that the burr is generated in the auxiliary member on one side with respect to the first butting portion, and the auxiliary member does not remain on the other side after the friction stirring step. The joining method according to claim 26, wherein:
A butt for forming a butt portion by inserting an end face of the plate-like first metal member into the concave groove of the second metal member having a plate shape and having a concave groove on the back surface and butting the end face against the bottom surface of the concave groove. Process,
A temporary bonding step of inserting only the stirring pin of the rotating rotary tool for temporary bonding into the inner corner constituted by the first metal member and the second metal member, and performing spot temporary bonding along the inner corner;
The rotating tool for main joining to rotate is inserted from the surface side of the second metal member, and only the stirring pin of the rotating tool for main joining is used for the second metal member, or the first metal member and the second metal. And a main joining step in which the abutting portion is friction stir welded by relatively moving the main welding rotary tool in a state of contact with both members.
The end face of the second metal member having a plate shape and notched corners on the back surface and the end surface of the third metal member having a plate shape and notched corners on the back surface are abutted with each other to form a concave groove and a first abutting portion. And a butting step of inserting the end face of the plate-like first metal member into the concave groove and abutting the end face against the bottom surface of the concave groove to form a second abutting portion;
Only the stirring pin of the rotating tool for temporary bonding that rotates is an inner corner composed of the first metal member and the second metal member and an inner corner composed of the first metal member and the third metal member. A temporary bonding step of inserting and performing spot temporary bonding along the inner corner;
The rotating tool for main joining to rotate is inserted from the surface side of the second metal member and the third metal member, and only the stirring pin of the rotating tool for main joining is connected to the second metal member and the third metal member, Or, the first butting portion and the second butting portion are frictionally stirred by moving the main welding rotary tool relative to each other in contact with the first metal member, the second metal member and the third metal member. And a main joining step for joining.
32. The joining method according to claim 30 or 31, wherein the temporary joining rotary tool and the main joining rotational tool are the same.
A butt for forming a butt portion by inserting an end face of the plate-like first metal member into the concave groove of the second metal member having a plate shape and having a concave groove on the back surface and butting the end face against the bottom surface of the concave groove. Process,
A temporary joining step of performing spot temporary joining by welding along an inner corner constituted by the first metal member and the second metal member;
The rotating tool for main joining to rotate is inserted from the surface side of the second metal member, and only the stirring pin of the rotating tool for main joining is used for the second metal member, or the first metal member and the second metal. And a main joining step in which the abutting portion is friction stir welded by relatively moving the main welding rotary tool in a state of contact with both members.
The end face of the second metal member having a plate shape and notched corners on the back surface and the end surface of the third metal member having a plate shape and notched corners on the back surface are abutted with each other to form a concave groove and a first abutting portion. And a butting step of inserting the end face of the plate-like first metal member into the concave groove and abutting the end face against the bottom surface of the concave groove to form a second abutting portion;
Temporary joining step of spot spot joining by welding along an inner corner composed of the first metal member and the second metal member and an inner corner composed of the first metal member and the third metal member When,
The rotating tool for main joining to rotate is inserted from the surface side of the second metal member and the third metal member, and only the stirring pin of the rotating tool for main joining is connected to the second metal member and the third metal member, Or, the first butting portion and the second butting portion are frictionally stirred by moving the main welding rotary tool relative to each other in contact with the first metal member, the second metal member and the third metal member. And a main joining step for joining.
35. The joining method according to claim 33 or claim 34, wherein the welding is TIG welding, MIG welding or laser welding.