JP2016215267A - Joining method - Google Patents

Abstract

An object is to provide a bonding method having high bonding strength. An overlapping process of overlapping a first metal member 1 and a second metal member 2 to form a superposed portion J1, and an end surface 1c of the first metal member 1 and a back surface 2b of the second metal member 2 Friction stir welding is performed by inserting a stirring pin of an inner corner joining tool into the inner corner U1 formed by the inner corner U2 and the surface 1a of the first metal member 1 and the end surface 2c of the second metal member 2 to be formed. The inner corner joining step and the rotary tool G are inserted from the surface 2a side, and the stirring pin G2 of the rotary tool G is brought into contact with only the second metal member 2 or both the first metal member 1 and the second metal member 2. A first main joining step in which the rotating tool G is relatively moved along the superposed portion J1 to friction stir weld the superposed portion J1, and in the first main joining step, the shoulder portion G1 is moved to the second portion. Friction stir welding is performed while pushing into the surface 2a of the metal member 2. To. [Selection] Figure 4

Description

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

  Patent Document 1 discloses a joining method in which a first metal member and a second metal member are overlapped and welded to an inner corner formed by a surface of the first metal member and an end surface of the second metal member. ing.

JP 2002-1444064 A

  In the prior art, since the strength of the welded portion is low, the first metal member and the second metal member may be separated.

  From such a viewpoint, an object of the present invention is to provide a bonding method having high bonding strength.

  In order to solve such a problem, the present invention includes an overlaying step of superposing the front surface of the plate-like first metal member and the back surface of the plate-like second metal member to form a superposition part, Stir the inner corner joining tool at the inner corner formed by the end surface of the metal member and the back surface of the second metal member and at the inner corner formed by the surface of the first metal member and the end surface of the second metal member. An inner corner joining process for inserting a pin to perform friction stir welding, and a rotating tool including a stirring pin and a shoulder portion are inserted from the surface side opposite to the back surface of the second metal member, and the stirring of the rotating tool is performed. Friction stirring the overlapping portion by moving the rotary tool relative to the overlapping portion while the pin is in contact with only the second metallic member or both the first metallic member and the second metallic member. A first main joining step of joining, the first In this bonding step, and carrying out friction stir welding while pushing the shoulder portion on a surface of the second metal member of the rotary tool.

  According to such a method, the joint strength of the overlapped portion can be increased by performing friction stir welding from the surfaces of the pair of inner corners and the second metal member to the overlapped portion. Moreover, the position shift of the 1st metal member and the 2nd metal member at the time of a 1st main joining process can be prevented by performing an inner corner joining process. Further, in the first main joining step, the occurrence of burrs can be suppressed by pushing the shoulder portion of the rotary tool into the second metal member.

  In addition, the present invention provides an overlapping process in which the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member are overlapped to form an overlapped portion, the end surface of the first metal member, and the first Friction stir by inserting the stirring pin of the inner corner joining tool into the inner corner formed by the back surface of the two metal member and the inner corner formed by the surface of the first metal member and the end surface of the second metal member Inserting an inner corner joining step for joining, and a rotating tool provided with a stirring pin from the surface side opposite to the back surface of the second metal member, only the stirring pin of the rotating tool only the second metal member, Or a first main joining step in which the rotating tool is relatively moved along the overlapping portion while being in contact with both the first metal member and the second metal member, and the overlapping portion is friction stir welded. , Including.

  According to such a method, the joint strength of the overlapped portion can be increased by performing friction stir welding from the surfaces of the pair of inner corners and the second metal member to the overlapped portion. Moreover, the position shift of the 1st metal member and the 2nd metal member at the time of a 1st main joining process can be prevented by performing an inner corner joining process. Further, by performing only the first main joining step by bringing only the stirring pin of the rotary tool into contact, friction stirring can be performed to a deep position without applying a large load to the friction stirring device.

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

  According to this method, since the friction stir is performed also from the back surface side of the first metal member, the bonding strength can be further increased and the bonding can be performed with a good balance.

  In addition, the present invention provides an overlapping process in which the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member are overlapped to form an overlapped portion, the end surface of the first metal member, and the first Friction stir by inserting the stirring pin of the inner corner joining tool into the inner corner formed by the back surface of the two metal member and the inner corner formed by the surface of the first metal member and the end surface of the second metal member An inner corner joining step for joining, and a main joining step for frictionally stirring and joining the overlapped portion by relatively moving a bobbin rotating tool including a pair of shoulder portions and a stirring pin connecting between the shoulder portions along the overlapped portion. In the main joining step, friction stir is performed in a state in which the pair of shoulder portions are in contact with the first metal member and the second metal member, respectively.

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

  In the inner corner joining step, it is preferable that the inner corner is continuously subjected to friction stirring in one pass. In the inner corner joining step, it is preferable that the inner corner is intermittently spaced to perform friction stirring. According to this method, the inner corner joining process can be easily performed.

  According to the joining method according to the present invention, the joining strength can be increased.

It is a figure which shows the joining tool for inner corners and rotation tool which are used by this invention, Comprising: (a) is a side view, (b) is sectional drawing which shows a joining state. (A) is a figure which shows the butt | matching process of the joining method which concerns on 1st embodiment of this invention, (b) is a perspective view which shows an inner corner joining process. It is a perspective view which shows the tab material joining process of the joining method which concerns on 1st embodiment of this invention. It is a figure which shows the 1st main joining process of the joining method which concerns on 1st embodiment, Comprising: (a) is a perspective view, (b) is sectional drawing. It is sectional drawing which shows the 2nd main joining process of the joining method which concerns on 1st embodiment. It is a figure which shows the 1st main joining process of the joining method which concerns on 2nd embodiment of this invention, Comprising: (a) is a perspective view, (b) is sectional drawing. It is sectional drawing which shows the 2nd main joining process of the joining method which concerns on 2nd embodiment. It is a perspective view which shows the bobbin tool of the joining method which concerns on 3rd embodiment. It is a figure which shows the main joining process of the joining method which concerns on 3rd embodiment, (a) is a perspective view, (b) is sectional drawing.

[First embodiment]
A joining method according to a first embodiment of the present invention will be described in detail with reference to the drawings. First, the rotating tool F used in the joining method of this embodiment will be described. As shown to (a) of FIG. 1, the rotary tool F is comprised by the connection part F1 and the stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting part F1 is a part connected to the rotating shaft of the friction stirrer. The connecting portion F1 has a cylindrical shape, and is formed with a screw hole (not shown) in which a bolt is fastened.

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

  In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove F3 clockwise as it goes from the proximal end to the distal end. In other words, the spiral groove F3 in this case is formed clockwise when viewed from above when the spiral groove F3 is traced from the proximal end to the distal end. By setting the spiral groove F3 in this way, the plastic fluidized metal at the time of frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove F3. Thereby, the quantity of the metal which overflows outside the to-be-joined metal member (the 1st metal member 1 and the 2nd metal member 2 which are mentioned later) can be decreased.

  As shown in FIG. 1B, when the friction stir welding is performed using the rotary tool F, only the rotated stirring pin F2 is inserted into the metal member to be joined, and the metal member to be joined and the connecting portion F1 are connected. Is moved while being separated. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W (W1, W2) is formed on the movement trajectory of the rotary tool F by hardening of the friction-stirred metal.

  As shown in FIG. 2A, in the joining method according to this embodiment, the first metal member 1 and the second metal member 2 are overlapped and joined by friction stirring. Both the first metal member 1 and the second metal member 2 have a plate shape. Although the plate | board thickness of the 1st metal member 1 and the 2nd metal member 2 may be formed so that it may differ, in this embodiment, it is the same. The first metal member 1 and the second metal member 2 are appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like.

  In the bonding method according to the present embodiment, an overlapping process, an inner corner bonding process, a tab material bonding process, a first main bonding process, and a second main bonding process are performed. As shown in FIG. 2A, the overlapping step is a step in which the superposed portion J1 is formed by overlapping the front surface 1a of the first metal member 1 and the back surface 2b of the second metal member 2. The 1st metal member 1 and the 2nd metal member 2 are restrained so that it cannot move via a clamp to a stand (illustration omitted). An inner corner U1 is formed by the surface 1a of the first metal member 1 and the end surface 2c of the second metal member 2. An inner corner U <b> 2 is formed by the back surface 2 b of the second metal member 2 and the end surface 1 c of the first metal member 1. The “front surface” means a surface opposite to the “back surface”.

  The inner corner joining step is a step of performing friction stir welding on the inner corners U1 and U2 using a rotary tool (inner corner joining tool) F as shown in FIG. 2 (b). In the inner corner joining step, the rotating tool F is relatively moved along the inner corner U1 while only the stirring pin F2 of the rotated rotating tool F is inserted into the inner corner U1. That is, the connecting portion F1 of the rotary tool F performs the friction stir welding by exposing the base end side of the stirring pin F2 without contacting the metal member to be joined. In the present embodiment, friction stir welding is continuously performed in one pass over the entire length of the inner corner U1. A plasticized region W is formed on the movement locus of the rotary tool F. Similarly, friction stir welding is also performed on the inner corner U2.

  In the inner corner joining step, for example, the rotating tool F can be attached to a robot arm having a rotation driving means such as a spindle unit at the tip, and friction stirring can be performed. According to such a friction stirrer, the angle of the rotation center axis of the rotary tool F with respect to the vertical axis can be easily changed.

  As shown in FIG. 3, the tab material joining step is a step of joining the tab materials T1 and T2 to both sides of the overlapping portion J1. Tab material T1, T2 is formed with the same material as the 1st metal member 1 and the 2nd metal member 2, and exhibits a rectangular parallelepiped. The height of the tab materials T1 and T2 is equal to the sum of the first metal member 1 and the second metal member 2 in the plate thickness direction. In the tab material joining step, the inner corner formed by the tab material T1, the first metal member 1 and the second metal member 2 is joined by welding. Similarly, the inner corner formed by the tab material T2, the first metal member 1 and the second metal member 2 is joined by welding. The surface T1a of the tab member T1 and the surface 2a of the second metal member 2 are flush with each other, and the back surface T1b and the back surface 1b of the first metal member 1 are flush with each other. Similarly, the surface T2a of the tab member T2 and the surface 2a of the second metal member 2 are flush with each other, and the back surface T2b and the back surface 1b of the first metal member 1 are flush with each other.

  The first main joining step is a step of friction stir welding the superposed portion J1 from the surface 2a side of the second metal member 2 as shown in FIG. In the first main joining process, the rotating tool G is used for joining. The rotary tool G includes a columnar shoulder portion G1 and a stirring pin G2 that hangs down from the shoulder portion G1. The stirring pin G2 is tapered toward the tip. A spiral groove is formed on the outer peripheral surface of the stirring pin G2.

  In the first main joining step, a start position Sp1 is set on the surface T1a of the tab material T1, and an end position Ep1 is set on the surface T2a of the tab material T2. In the first main joining step, the stirring pin G2 of the rotating tool G that rotates to the start position Sp1 is inserted. Then, the rotary tool G is relatively moved toward the end position Ep1 along the overlapping portion J1. A plasticized region W1 is formed in the movement locus of the rotary tool G.

  As shown in FIG. 4B, in the first main joining step, friction stirring is performed while pushing the lower end surface of the shoulder portion G1 of the rotary tool G into the second metal member 2 by about several millimeters. The insertion depth of the stirring pin G2 may be set as appropriate, but is preferably set so that the stirring pin G2 reaches the overlapping portion J1. That is, friction stir welding is performed in a state where the stirring pin G2 is in contact with both the first metal member 1 and the second metal member 2.

  When the stirring pin G2 does not reach the overlapping portion J1, that is, when the stirring pin G2 is brought into contact only with the second metal member 2, the overlapping portion J1 is plastically flowed by frictional heat between the rotary tool G and the second metal member 2. To be joined. When the rotary tool G reaches the end position Ep1, the rotary tool G is detached from the tab material T2. When the first main joining process is completed, the first metal member 1 and the second metal member 2 are turned over and clamped again on the gantry.

  As shown in FIG. 5, the second main joining step is a step of friction stir welding the overlapping portion J <b> 1 from the back surface 1 b side of the first metal member 1. In the second main joining step, the rotating tool G is used for joining. In the second main joining step, a start position is set for one of the tab material T1 and the tab material T2, and an end position is set for the other. In the second main joining step, friction stir welding is performed in the same manner as in the first main joining step. That is, while the lower end surface of the shoulder portion G1 of the rotating tool G is pushed into the back surface 1b of the first metal member 1 by several millimeters, the rotating tool G is relatively moved along the overlapping portion J1 to perform friction stirring. A plasticized region W2 is formed in the movement locus of the rotary tool G.

  The insertion depth of the stirring pin G2 in the second main joining step may be set as appropriate, but in the present embodiment, it is preferable to set the stirring pin G2 so as to reach the overlapping portion J1. That is, friction stir welding is performed in a state where the stirring pin G2 is in contact with both the first metal member 1 and the second metal member 2. By setting the insertion depth so that the tip of the stirring pin G2 enters the plasticizing region W1, the plasticizing region W1 and the plasticizing region W2 overlap.

  When the stirring pin G2 does not reach the overlapping portion J1, that is, when the stirring pin G2 is brought into contact only with the first metal member 1, the overlapping portion J1 is plastically flowed by frictional heat between the rotary tool G and the first metal member 1. To be joined. When the rotary tool G reaches the end position, the rotary tool G is detached from the tab material. Thus, the first metal member 1 and the second metal member 2 are joined.

  In addition, you may perform the burr cutting process which cuts the burr | flash which generate | occur | produced in the inner corner joining process, the 1st main joining process, and the 2nd main joining process as needed. Thereby, the inner corners U1 and U2, the back surface 1b of the first metal member 1, and the surface 2a of the second metal member 2 can be finished finely.

  According to the joining method according to the first embodiment described above, in addition to the pair of inner corners U1 and U2, by performing friction stir welding from the surface 2a of the second metal member 2 to the overlapping portion J1, the overlapping portion J1. It is possible to increase the bonding strength. Moreover, the position shift of the 1st metal member 1 and the 2nd metal member 2 at the time of a 1st main joining process can be prevented by performing an inner corner joining process. Further, by pushing the shoulder portion G1 into the second metal member 2, the generation of burrs can be suppressed. Moreover, although the 2nd main joining process may be abbreviate | omitted, joining strength can be raised more by performing both a 1st main joining process and a 2nd main joining process like this embodiment. At the same time, it can be joined in a balanced manner.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. This embodiment is different from the first embodiment in that the inner corner joining step, the first main joining step, and the second main joining step are friction stir welded using the rotary tool F. In the bonding method according to the present embodiment, an overlapping process, an inner corner bonding process, a tab material bonding process, a first main bonding process, and a second main bonding process are performed. Since the overlapping process is the same as that of the first embodiment, the description thereof is omitted.

  In the inner corner joining step, as shown in FIG. 6A, friction stir welding is performed on the inner corners U <b> 1 and U <b> 2 using a rotating tool (inner corner joining tool) F. In the inner corner joining step, friction stirring is intermittently performed on the entire length of the inner corners U1 and U2. A plasticized region W is formed in the inner corners U1 and U2 with a space therebetween. Since the tab material joining step is the same as that in the first embodiment, description thereof is omitted.

  The first main joining step is a step of friction stir welding the superposed portion J1 from the surface 2a side of the second metal member 2 as shown in FIG. In the first main joining step, joining is performed using a rotating tool (a shoulderless rotating tool that also serves as an inner corner joining tool) F.

  In the first main joining step, a start position Sp1 is set on the surface T1a of the tab material T1, and an end position Ep1 is set on the surface T2a of the tab material T2. In the first main joining step, the stirring pin F2 of the rotating tool F rotated to the right is inserted into the start position Sp1. Then, the rotary tool F is relatively moved toward the end position Ep1 along the overlapping portion J1. A plasticizing region W1 is formed on the movement locus of the rotary tool F.

  As shown in FIG. 6B, in the first main joining step, the connecting portion F1 of the rotary tool F is separated from the second metal member 2 to perform friction stir welding. That is, the friction stir welding is performed with the base end side of the stirring pin F2 exposed. The insertion depth of the stirring pin F2 may be set as appropriate, but is preferably set so that the stirring pin F2 reaches the overlapping portion J1. That is, friction stir welding is performed in a state where the stirring pin F <b> 2 is in contact with both the first metal member 1 and the second metal member 2.

  When the stirring pin F2 does not reach the overlapping portion J1, that is, when the stirring pin F2 is brought into contact with only the second metal member 2, the overlapping portion J1 is plastically flowed by frictional heat between the rotary tool F and the second metal member 2. To be joined. When the rotary tool F reaches the end position Ep1, the rotary tool F is detached from the tab material T2. When the first main joining process is completed, the first metal member 1 and the second metal member 2 are turned over and clamped again on the gantry.

  The second main joining step is a step of joining the overlapping portion J1 from the back surface 1b side of the first metal member 1 as shown in FIG. In the second main joining step, the rotary tool F is used to join by friction stirring. In the second main joining step, a start position is set for one of the tab material T1 and the tab material T2, and an end position is set for the other. In the second main joining step, friction stir welding is performed in the same manner as in the first main joining step. That is, the connecting portion F1 of the rotary tool F is separated from the first metal member 1 to perform friction stir welding. A plasticizing region W2 is formed in the movement locus of the rotary tool F.

  The insertion depth of the stirring pin F2 in the second main joining step may be set as appropriate, but in the present embodiment, it is preferable to set so that the stirring pin F2 reaches the overlapping portion J1. That is, friction stir welding is performed in a state where the stirring pin F <b> 2 is in contact with both the first metal member 1 and the second metal member 2. By setting the insertion depth so that the tip of the stirring pin F2 enters the plasticizing region W1, the tip side of the plasticizing region W1 and the plasticizing region W2 overlap.

  When the stirring pin F2 does not reach the overlapping portion J1, that is, when the stirring pin F2 is brought into contact only with the first metal member 1, the overlapping portion J1 is plastically flowed by frictional heat between the rotary tool F and the first metal member 1. To be joined. When the rotary tool F reaches the end position, the rotary tool F is detached from the tab material. Thus, the first metal member 1 and the second metal member 2 are joined.

  In addition, you may perform the burr cutting process which cuts out the burr | flash which generate | occur | produced in inner corner U1, U2, the 1st main joining process, and the 2nd main joining process as needed. Thereby, the back surface 1b of the 1st metal member 1 and the surface 2a of the 2nd metal member 2 can be finished finely. Moreover, when the recessed groove formed in the back surface 1b of the 1st metal member 1 and the surface 2a of the 2nd metal member 2 is large, you may perform the repair process which performs overlay welding and repairs.

  According to the joining method according to the second embodiment, in addition to the pair of inner corners U1 and U2, by performing friction stir welding from the surface 2a of the second metal member 2 to the superposed part J1, the joint strength of the superposed part J1 Can be increased. Moreover, the position shift of the 1st metal member 1 and the 2nd metal member 2 at the time of a 1st main joining process can be prevented by performing an inner corner joining process. Further, by performing only the first main joining step by bringing only the stirring pin F2 of the rotary tool F into contact, friction stirring can be performed to a deep position without applying a large load to the friction stirring device. When the plate thickness of the first metal member 1 and the second metal member 2 is large, it is effective to perform friction stirring using the rotary tool F.

  In addition, according to the rotating tool F, the width of the plasticized regions W1, W2 can be reduced, so that the width of the overlapping portion J1 (the overlap margin of the first metal member 1 and the second metal member 2) is reduced. Can do. Moreover, although the 2nd main joining process may be abbreviate | omitted, joining strength can be raised more by performing both a 1st main joining process and a 2nd main joining process like this embodiment. At the same time, it can be joined in a balanced manner.

  The inner corner joining tool may be separate from the rotary tool used in the first main joining step and the second main joining step, but these steps are performed using the rotary tool F as in the present embodiment. This saves the trouble of changing the rotating tool.

  In the second embodiment, the inner corner joining step, the first main joining step, and the second main joining step are performed using the rotating tool F. However, each step may be performed using the rotating tool G. . In this case, the friction stir welding may be performed with the proximal end side of the stirring pin G2 of the rotary tool G exposed. In this way, the trouble of replacing the rotating tool can be omitted.

[Third embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. In the bonding method according to the present embodiment, an overlapping process, an inner corner bonding process, and a main bonding process are performed. Since the overlapping step and the inner corner joining step are the same as those in the first embodiment, description thereof is omitted.

  As shown in FIG. 8, the main joining step is a step of performing friction stir welding on the overlapping portion J <b> 1 using the bobbin rotating tool H. The bobbin rotating tool H includes a first shoulder portion H1, a second shoulder portion H2, and a stirring pin H3. The first shoulder portion H1 has a substantially cylindrical shape. A tapered portion H1a having a diameter reduced toward the stirring pin H3 is formed on the stirring pin H3 side of the first shoulder portion H1. An end face H1b is formed at the end of the tapered portion H1a.

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

  In the main joining step, as shown in FIG. 9A, after the first metal member 1 and the second metal member 2 are clamped to a mount (not shown) so as not to move, the first metal member 1 and the second metal member are clamped. The bobbin rotating tool H is positioned on the side of the member 2. The height position is adjusted so that the longitudinal center of the stirring pin H3 is positioned on the extension of the overlapping portion J1. Then, while rotating the bobbin rotating tool H, the bobbin rotating tool H is caused to enter the first metal member 1 and the second metal member 2 and is relatively moved along the overlapping portion J1. Since the length of the stirring pin H3 (distance between the first shoulder portion H1 and the second shoulder portion H2) is smaller than the sum of the plate thicknesses of the first metal member 1 and the second metal member 2, the second metal The first shoulder portion H1 (end surface H1b) is pushed into the surface 2a of the member 2, and the second shoulder portion H2 (end surface H2b) is pushed into the back surface 1b of the first metal member 1. A plasticized region W <b> 3 is formed on the movement locus of the bobbin rotating tool H. Thus, the first metal member 1 and the second metal member 2 are joined.

  In addition, you may perform the burr cutting process which cuts the burr | flash which generate | occur | produced in the inner corner joining process and this joining process as needed. Thereby, the inner corners U1 and U2, the back surface 1b of the first metal member 1, and the surface 2a of the second metal member 2 can be finished finely.

  According to the joining method which concerns on 3rd embodiment demonstrated above, in addition to a pair of inner corner U1, U2, joining strength can be raised by performing friction stir welding to the superposition | polymerization part J1. Moreover, the position shift of the 1st metal member 1 and the 2nd metal member 2 at the time of this joining process can be prevented by performing an inner corner joining process. Further, by performing the main joining step using the bobbin rotating tool H, the whole of the first metal member 1 and the second metal member 2 in the plate thickness direction can be joined in one pass. Moreover, by pushing the first shoulder H1 into the front surface 2a of the second metal member 2 and pushing the second shoulder H2 into the back 1b of the first metal member 1, the generation of burrs can be suppressed.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, the second main joining process in the first embodiment may be performed using the rotary tool F. Further, the second main joining step in the second embodiment may be performed using the rotating tool G. Moreover, in 1st embodiment and 2nd embodiment, although tab material T1, T2 was provided, you may abbreviate | omit.

1 1st metal member 1a surface 1b back surface 2 2nd metal member 2a surface 2b back surface J1 superposition part F rotation tool (joining tool for inner corner)
F1 connecting part F2 stirring pin G rotating tool G1 shoulder part G2 stirring pin H bobbin rotating tool U1 inner corner U2 inner corner

Claims (7)

An overlapping step of overlapping the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a superposed portion;
Inner corner joining to the inner corner formed by the end surface of the first metal member and the rear surface of the second metal member and the inner corner formed by the surface of the first metal member and the end surface of the second metal member. Inner corner joining process of inserting a stirring pin of a tool and performing friction stir welding,
A rotating tool including a stirring pin and a shoulder portion is inserted from the surface side opposite to the back surface of the second metal member, and the stirring pin of the rotating tool is only the second metal member or the first metal member. And a first main joining step of friction stir welding the superposed part by relatively moving the rotary tool along the superposed part in a state of being in contact with both the second metal member,
In the first main joining step, a friction stir welding is performed while pressing the shoulder portion of the rotary tool into the surface of the second metal member. An overlapping step of overlapping the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a superposed portion;
Inner corner joining to the inner corner formed by the end surface of the first metal member and the rear surface of the second metal member and the inner corner formed by the surface of the first metal member and the end surface of the second metal member. Inner corner joining process of inserting a stirring pin of a tool and performing friction stir welding,
A rotary tool provided with a stirring pin is inserted from the surface side opposite to the back surface of the second metal member, and only the stirring pin of the rotary tool is only the second metal member, or the first metal member and the A first main joining step in which the rotating tool is relatively moved along the overlapped portion in contact with both of the second metal members to friction stir weld the overlapped portion. Method. A rotary tool including a stirring pin and a shoulder portion is inserted from the back side opposite to the surface of the first metal member, and the stirring pin of the rotary tool is only the first metal member or the first metal member and the A second main joining step in which the rotating tool is relatively moved along the overlapping portion in contact with both of the second metal members, and the overlapping portion is friction stir welded.
In the second main joining step, friction stir is performed while pushing the shoulder portion of the rotating tool into the back surface of the first metal member, and the plasticized region and the second main joining in the first main joining step are performed. The joining method according to claim 1, wherein the plasticizing region of the process is overlapped. A rotary tool provided with a stirring pin is inserted from the back side opposite to the surface of the first metal member, and only the first metal member or only the first metal member and the second metal A second main joining step in which the rotating tool is relatively moved along the overlapped portion in contact with both of the metal members to friction stir weld the overlapped portion.
3. The method according to claim 1, wherein in the second main joining step, the plasticizing region in the first main joining step and the plasticizing region in the second main joining step overlap each other. Joining method. An overlapping step of overlapping the surface of the plate-shaped first metal member and the back surface of the plate-shaped second metal member to form a superposed portion;
Inner corner joining to the inner corner formed by the end surface of the first metal member and the rear surface of the second metal member and the inner corner formed by the surface of the first metal member and the end surface of the second metal member. Inner corner joining process of inserting a stirring pin of a tool and performing friction stir welding,
A bobbin rotating tool provided with a pair of shoulder portions and a stirring pin connecting between the shoulder portions, and a main joining step of frictionally stir welding the overlapped portion by relatively moving a bobbin rotating tool along the overlapped portion,
In the main joining step, a friction stir is performed in a state where the pair of shoulder portions are in contact with the first metal member and the second metal member, respectively.   The joining method according to any one of claims 1 to 5, wherein in the inner corner joining step, friction agitation is continuously applied to the inner corner in one pass.   The joining method according to any one of claims 1 to 5, wherein in the inner corner joining step, friction stir is performed intermittently with respect to the inner corner.

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