JP6578800B2 - Joining method - Google Patents

Description

  The present invention relates to a method for joining metal members.

  Patent Document 1 discloses a joining method in which a plate-like first metal member and a plate-like second metal member are brought into contact with each other and subjected to friction stir welding. In the joining method, the end step of the first metal member and the end surface of the second metal member are abutted to form an abutting portion, and the rotary tool is pushed in from the front and back surfaces of the first metal member and the second metal member, respectively. And a friction stir process in which the butt portion is friction stir welded.

JP 2009-172649 A

  In the conventional joining method, the lower end surface of the shoulder portion of the rotary tool is pushed into the front and back surfaces of the first metal member and the second metal member, respectively, and the friction stirring process is performed. Therefore, burrs are generated on the front and back surfaces. For this reason, a burr removal process for removing the burr must be performed. Moreover, since the friction stirring step is performed by pushing the lower end surface of the shoulder portion of the rotary tool into the front and back surfaces of the first metal member and the second metal member, there is a problem that the load applied to the friction stirring device increases.

  From such a viewpoint, the present invention provides a joining method that can prevent burrs from being generated on the surfaces of the first metal member and the second metal member, and can reduce the load applied to the friction stirrer. It is characterized by doing. Moreover, this invention provides the joining method which can make the load concerning a friction stirrer small while it can prevent that a burr | flash generate | occur | produces on the surface and back surface of a 1st metal member and a 2nd metal member. It is characterized by.

In order to solve such a problem, the present invention is a joining method in which metal members are friction stir welded to each other, and the opposing end surfaces of the metal members are arranged on an outer end surface formed on the back surface side and on the front surface side. An inner end surface formed on a side separated from the metal member facing the outer end surface and an intermediate surface connecting the outer end surface and the inner end surface; and The outer end surfaces are butted together to form a butted portion, a butting step is formed to form a concave groove formed by the intermediate surfaces and the inner end surfaces, and a rotating tool is inserted from the surface side of the metal members. A friction stir process for performing friction stir welding on the butting portion, and the rotating tool includes a shoulder portion having a columnar shape and a stirring pin hanging from the shoulder portion, and the shoulder portion Set the diameter smaller than the width of the groove, the stirring pin is a tapered, in the friction stir process, insert the shoulder portion of the rotary tool into said groove, said said shoulder portion The bottom surface of the concave groove and both side walls of the concave groove are formed by friction stir welding of the butt portion while holding the burr generated from each metal member with the shoulder portion while being separated from the bottom surface of the concave groove. And burrs are deposited in the space formed by the lower end surface of the shoulder portion .

  According to such a method, a narrow space is formed on the bottom surface of the groove, both side walls of the groove and the lower end surface of the shoulder portion, so that burrs are prevented from being scattered and burrs are deposited on the bottom surface of the groove. Can do. Thereby, it can prevent that a burr | flash generate | occur | produces on the surface of a 1st metal member and a 2nd metal member. Moreover, since a shoulder part is not pushed in into the bottom face of a ditch | groove, the load concerning a friction stirrer can be made small.

Further, the present invention is a joining method for friction stir welding metal members, the end surface of the metal members, the outer end surface formed in the center of the plate thickness direction, the surface side with respect to the outer end surface, and A pair of inner end surfaces formed on the back surface side and formed on the side away from the metal member facing the outer end surface, and a pair of the outer end surface and the pair of inner end surfaces, respectively. An intermediate surface, and abutting portions are formed by abutting the outer end surfaces of the metal members, and the intermediate surfaces and the inner end surfaces are formed on the front surface side and the back surface side of the metal members, respectively. A butting process for forming a pair of concave grooves composed of each other, and a first friction stirring process for inserting a rotating tool from the surface side of the metal members and performing friction stir welding to the butting portion; A second friction stir step in which a rotating tool is inserted from the back side of the metal members and friction stir welding is performed with respect to the butt portion, and the rotating tool has a columnar shoulder portion and the shoulder portion. And a diameter of the shoulder portion is set smaller than a width of the concave groove, the stirring pin is tapered, and the first friction stirring step and the second friction stirring In the stirring step, the shoulder portion of the rotating tool is inserted into the groove, and the burr generated from each metal member is pressed by the shoulder portion with the shoulder portion being separated from the bottom surface of the groove. while, by friction stir welding the butted portion, and wherein the deposition of a burr on the bottom of the groove, which is configured with side walls and the lower end surface of the shoulder portion of the groove space

  According to such a method, since a narrow space is formed on the bottom surface, both side walls, and the lower end surface of the shoulder portion of each groove, it is possible to prevent burrs from being scattered and to deposit burrs on the bottom surface of each groove. it can. Thereby, it can prevent that a burr | flash generate | occur | produces on the surface and back surface of a 1st metal member and a 2nd metal member. Moreover, since a shoulder part is not pushed in into the bottom face of a ditch | groove, the load concerning a friction stirrer can be made small.

  Moreover, it is preferable to overlap the plasticization area | region formed at said 1st friction stirring process, and the plasticization area | region formed at said 2nd friction stirring process.

  According to this method, the entire length in the depth direction of the butt portion is frictionally stirred, so that the joint strength is improved and the water tightness and the air tightness can be enhanced.

Further, it includes a tab material arranging step of arranging tab materials at both ends of the abutting portion, and in the friction stirring step, the friction stir starting point is provided on one tab material, and the friction stirring end point is set on the other tab material. It is preferable to provide it.
In addition, a spiral groove is formed on the outer peripheral surface of the stirring pin, and when the spiral groove of the stirring pin is formed counterclockwise from the proximal end to the distal end of the stirring pin, the rotating tool is rotated clockwise. When the spiral groove of the stirring pin is formed clockwise as it goes from the proximal end to the distal end of the stirring pin, it is preferable to rotate the rotating tool counterclockwise.
The first metal member and the second metal member are preferably formed of aluminum or an aluminum alloy.

  According to this method, it is possible to easily set the start position and the end position of friction stirring, and it is possible to cleanly form the side surface of the metal member.

  According to the joining method according to the present invention, it is possible to prevent burrs from being generated on the surfaces of the first metal member and the second metal member, and to reduce the load applied to the friction stirrer. Moreover, according to the joining method which concerns on this invention, while being able to prevent a burr | flash generate | occur | producing on the surface and back surface of a 1st metal member and a 2nd metal member, the load concerning a friction stirring apparatus can be made small. .

It is a figure which shows the joining method which concerns on 1st embodiment of this invention, Comprising: (a) is a perspective view which shows a preparation process, (b) is sectional drawing which shows a butt | matching process. It is a figure which shows the joining method which concerns on 1st embodiment, Comprising: (a) is a perspective view which shows a tab material arrangement | positioning process, (b) is a perspective view which shows a friction stirring process. It is a schematic cross section which shows the friction stirring process of the joining method which concerns on 1st embodiment. It is a figure which shows the joining method which concerns on 2nd embodiment of this invention, Comprising: (a) is sectional drawing which shows a preparatory process, (b) is sectional drawing which shows a butt | matching process. It is a figure which shows the 1st friction stirring process which concerns on 2nd embodiment, Comprising: (a) is a perspective view, (b) is a schematic cross section. It is a schematic cross section which shows the 2nd friction stirring process which concerns on 2nd 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 first embodiment, the first metal member 1 and the second metal member 2 are abutted and joined. The joining method according to the first embodiment performs a preparation process, a butting process, a tab material arranging process, and a friction stirring process. In the description, “front surface” means a surface opposite to the “back surface”.

  The preparation step is a step of preparing the first metal member 1 and the second metal member 2 as shown in FIG. 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 stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like. In the preparation step, the end surface of the first metal member 1 is formed by an outer end surface 1d, an inner end surface 1e, and an intermediate surface 1f. The inner end face 1e is formed on the side away from the second metal member 2 facing the outer end face 1d. The intermediate surface 1f connects the outer end surface 1d and the inner end surface 1e, and is perpendicular to the outer end surface 1d and the inner end surface 1e. The inner end face 1e and the intermediate face 1f of the first metal member 1 may be formed by notching the end face, or may be formed in advance by die casting.

  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 second metal member 2 is formed in the same shape as the first metal member 1. That is, in the preparation step, the end surface of the second metal member 2 is formed to be constituted by the outer end surface 2d, the inner end surface 2e, and the intermediate surface 2f. The inner end face 2e is formed on the side away from the first metal member 1 facing the outer end face 2d. The intermediate surface 2f connects the outer end surface 2d and the inner end surface 2e, and is perpendicular to the outer end surface 2d and the inner end surface 2e.

  The butting step is a step of forming a butting portion J by butting the end surface of the first metal member 1 and the end surface of the second metal member 2 as shown in FIG. In the butting step, the outer end surface 1d of the first metal member 1 and the outer end surface 2d of the second metal member 2 are butted. Thereby, the butt | matching part J is formed. A concave groove 10 is formed by the opposed inner end faces 1e, 2e and the continuous intermediate faces 1f, 2f. The concave groove 10 has a rectangular cross section. The concave groove 10 includes a bottom surface 10a (intermediate surfaces 1f, 2f) and side walls 10b, 10b (inner end surfaces 1e, 2e).

  The tab material arranging step is a step of arranging a pair of tab materials T at both ends of the abutting portion J as shown in FIG. The tab material T has a rectangular parallelepiped shape and is formed of the same material as the first metal member 1 and the second metal member 2. The thickness of the tab material T is formed to be equal to the height of the outer end faces 1d and 2d. In the tab material arranging step, the side surfaces of the tab material T are brought into contact with the side surfaces of the first metal member 1 and the second metal member 2, and the inner corner of the first metal member 1 and the tab material T and the second metal member 2. The inner corner of the tab material T is temporarily joined by welding. The surface Tb of the tab material T and the bottom surface 10a of the groove 10 are flush with each other, and the back surface Tc of the tab material T, the back surface 1c of the first metal member 1 and the back surface 2c of the second metal member 2 are flush with each other. To do.

  As shown in FIGS. 2A and 2B, the friction stirring step is a step of inserting the shoulder portion G1 of the rotary tool G into the concave groove 10 and friction stir welding the butt portion J. The rotary tool G includes a cylindrical shoulder portion G1 and a stirring pin G2 that hangs down from the lower end surface G1a of the shoulder portion G1. The diameter of the shoulder portion G1 is slightly smaller than the width of the concave groove 10. The diameter of the shoulder portion G1 may be set so that the outer peripheral surface of the shoulder portion G1 and the side walls 10b, 10b of the concave groove 10 are in contact with each other. It is preferable that the side wall 10b, 10b of the concave groove 10 has a dimension capable of relative movement with a slight gap.

  The stirring pin G2 is tapered. A spiral groove is formed on the outer peripheral surface of the stirring pin G2. In this embodiment, in order to rotate the rotary tool G to the right, the spiral groove of the stirring pin G2 is formed counterclockwise as it goes from the proximal end to the distal end. In other words, the spiral groove is formed counterclockwise as viewed from above when the spiral groove is traced from the proximal end to the distal end.

  In addition, when rotating the rotation tool G counterclockwise, it is preferable to form the spiral groove clockwise as it goes from the proximal end to the distal end. In other words, the spiral groove in this case is formed clockwise when viewed from above when the spiral groove is traced from the proximal end to the distal end. By setting the spiral groove in this manner, the plastic fluidized metal in the friction stirring step is guided to the tip side of the stirring pin G2 by the spiral groove. Thereby, the quantity of the metal which overflows from the bottom face 10a of the ditch | groove 10 can be decreased.

  In the friction stirring step, as shown in FIG. 2 (b), first, the stirring pin G2 of the rotary tool G is inserted into the start position Sp set on the surface Tb of one of the tab members T, and the lower end surface G1a is placed on the surface. Relative movement is made toward the butt J while being pushed into Tb. When the rotary tool G enters the butting portion J, as shown in FIG. 3, the rotary tool G is relatively moved along the butting portion J (concave groove 10) while the lower end surface G1a is separated from the bottom surface 10a of the concave groove 10. Let A plasticized region W is formed in the movement locus of the rotary tool G.

  In the friction stirring step, the lower end surface G1a of the shoulder portion G1 is set apart from the bottom surface 10a of the recessed groove 10 and lower than the surface 1b of the first metal member 1. That is, in the friction stirring step, friction stir welding is performed while pressing the burr V generated by the friction stirring with the lower end surface G1a of the shoulder portion G1. “The state in which the shoulder portion is separated from the bottom surface of the concave groove” in the claims means that the lower end surface G1a of the shoulder portion G1 is separated from the bottom surface 10a of the concave groove 10 before the burr V is generated. It is. Further, in the claims, “while pressing the burr generated from each metal member with the shoulder portion” means that the accumulated burr V is in contact with the lower end face G1a of the shoulder portion G1, and the surface of the burr V This means that the (upper surface) is pressed by the lower end surface G1a of the shoulder portion G1.

  Further, the outer peripheral surface of the shoulder portion G1 and the side walls 10b, 10b of the groove 10 are separated from each other with a slight gap. A narrow space is formed by the bottom surface 10a of the concave groove 10, the side walls 10b and 10b of the concave groove 10, and the lower end surface G1a of the shoulder portion G1.

  A burr V is generated on the bottom surface 10a of the groove 10 by the friction stir process. However, a narrow space (rectangular cross section) constituted by the bottom surface 10a of the groove 10, the side walls 10b and 10b of the groove 10 and the lower end surface G1a of the shoulder portion G1. The burr V is confined in the closed space), and the burr V is deposited on the bottom surface 10a. As shown in FIG. 3, the burr V is accommodated in the concave groove 10, and the surface (upper surface) of the burr V is pressed by the lower end surface G1a of the shoulder portion G1 and becomes substantially flat. When the rotary tool G reaches the end position Ep set on the surface Tb of the other tab material T, the rotary tool G is detached from the tab material T. Further, the tab material T is cut from the first metal member 1 and the second metal member 2.

  According to the joining method according to the present embodiment described above, a narrow space is formed by the bottom surface 10a of the recessed groove 10, the side walls 10b and 10b of the recessed groove 10, and the lower end surface G1a of the shoulder portion G1 when performing the friction stirring process. Therefore, it is possible to prevent the burrs V from being scattered and to deposit the burrs V on the bottom surface 10 a of the concave groove 10. Thereby, it can prevent that the burr | flash V generate | occur | produces on the surface 1b of the 1st metal member 1, and the surface 2b of the 2nd metal member 2. FIG. Therefore, surface treatments such as a burr removing step on the surface 1b of the first metal member 1 and the surface 2b of the second metal member 2 can be omitted.

  Moreover, according to the joining method which concerns on this embodiment, since the shoulder part G1 is not pushed in into the bottom face 10a of the ditch | groove 10, the load concerning a friction stirrer can be made small. Moreover, since the friction stir process is performed using the pair of tab members T, the start position Sp and the end position Ep of the friction stir process can be easily set, and the first metal member 1 and the second metal member 2 can be set. The side can be finished cleanly.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. The joining method according to the second embodiment differs from the first embodiment in that friction stir welding is performed from the front and back of the first metal member 1A and the second metal member 2A. In the description according to the second embodiment, the description of the same parts as those in the first embodiment is omitted.

  In the joining method according to the second embodiment, a preparation process, a butting process, a tab material arranging process, a first friction stirring process, and a second friction stirring process are performed. In the preparation step, the end surface of the first metal member 1A is formed so as to be composed of an outer end surface 1d, an inner end surface 1e, an intermediate surface 1f, an inner end surface 1g, and an intermediate surface 1h. The inner end face 1g is formed on the back side of the outer end face 1d, and is formed on the side away from the opposing second metal member 2A. The intermediate surface 1h connects the outer end surface 1d and the inner end surface 1g, and is perpendicular to the outer end surface 1d and the inner end surface 1g. That is, the inner end surface 1e and the intermediate surface 1f are formed on the surface 1b side of the first metal member 1A, and the inner end surface 1g and the intermediate surface 1h are formed on the back surface 1c side of the first metal member 1A.

  The second metal member 2A is formed in the same shape as the first metal member 1A. That is, in the preparation step, the end surface of the second metal member 2A is formed to be constituted by the outer end surface 2d, the inner end surface 2e, the intermediate surface 2f, the inner end surface 2g, and the intermediate surface 2h. The inner end face 2g is formed on the side away from the first metal member 1A facing the outer end face 2d. The intermediate surface 2h connects the outer end surface 2d and the inner end surface 2g, and is perpendicular to the outer end surface 2d and the inner end surface 2g. That is, the inner end surface 2e and the intermediate surface 2f are formed on the surface 2b side of the second metal member 2A, and the inner end surface 2g and the intermediate surface 2h are formed on the back surface 2c side of the second metal member 2A.

  As shown in FIGS. 4A and 4B, the butting step is a step of forming a butting portion J by butting the end surface of the first metal member 1A and the end surface of the second metal member 2A. In the butting step, the outer end surface 1d of the first metal member 1A and the outer end surface 2d of the second metal member 2A are butted. Thereby, the butt | matching part J is formed. A concave groove 10 is formed by the opposed inner end faces 1e, 2e and the continuous intermediate faces 1f, 2f. A concave groove 11 is formed by the opposed inner end faces 1g, 2g and the continuous intermediate faces 1h, 2h. The concave groove 11 has a rectangular cross section. The concave groove 11 includes a bottom surface 11a (intermediate surfaces 1h, 2h) and side walls 11b, 11b (inner end surfaces 1g, 2g).

  The tab material arranging step is a step of arranging a pair of tab materials T at both ends of the abutting portion J as shown in FIG. The tab material T has a rectangular parallelepiped shape and is formed of the same material as the first metal member 1A and the second metal member 2A. The thickness of the tab material T is formed to be equal to the height of the outer end faces 1d and 2d. In the tab material arranging step, the side surfaces of the tab material T are brought into contact with the side surfaces of the first metal member 1A and the second metal member 2A, the inner corners of the first metal member 1 and the tab material T, and the second metal member 2 The inner corner of the tab material T is temporarily joined by welding. The surface Tb of the tab material T and the bottom surface 10a of the groove 10 are flush with each other, and the back surface Tc of the tab material T and the bottom surface 11a of the groove 11 are flush.

  In the first friction stirring step, as shown in FIGS. 5A and 5B, the rotating tool G is inserted into the concave groove 10 in the same manner as the friction stirring step of the first embodiment, and the butt portion J is inserted. Friction stir welding. A plasticized region W1 is formed in the movement locus of the rotary tool G. In the second friction stirring step, as shown in FIG. 6, the first metal member 1 </ b> A and the second metal member 2 </ b> A are turned over, the rotating tool G is inserted into the concave groove 11, and the friction stir welding is performed on the butt portion J. I do.

  In the second friction stirring step, the rotary tool G is inserted at the start position set on the back surface Tc of one tab member T, and the rotary tool G is relatively moved toward the first metal member 1A and the second metal member 2A. Let When the rotary tool G enters the abutting portion J, the rotary tool G is moved along the abutting portion J (concave groove 11) while the lower end surface G1a is separated from the bottom surface 11a of the concave groove 11 as shown in FIG. Move relative. A plasticized region W2 is formed in the movement locus of the rotary tool G.

  In the second friction stirring step, the lower end surface G1a of the shoulder portion G1 is set apart from the bottom surface 11a of the groove 11 and lower than the back surface 1c of the first metal member 1A. That is, in the second friction stirring step, friction stir welding is performed while pressing the burr V generated by the friction stirring with the lower end surface G1a of the shoulder portion G1. Further, the second friction stirring step is the same as the first friction stirring step except that the insertion depth is adjusted so that the stirring pin G2 of the rotary tool G reaches the plasticizing region W1.

  According to the joining method according to the present embodiment described above, when the first friction stirring step is performed, the bottom surface 10a of the recessed groove 10, the side walls 10b and 10b of the recessed groove 10, and the lower end surface G1a of the shoulder portion G1 are narrow. Since the space is formed, it is possible to prevent the burrs V from being scattered and to deposit the burrs V on the bottom surface 10 a of the concave groove 10. Thereby, it can prevent that the burr | flash V generate | occur | produces on the surface 1b of 1 A of 1st metal members, and the surface 2b of 2 A of 2nd metal members.

  Further, when the second friction stirring step is performed, a narrow space is formed by the bottom surface 11a of the groove 11, the side walls 11b and 11b of the groove 11 and the lower end surface G1a of the shoulder portion G1, so that the burrs V are scattered. In addition, the burrs V can be deposited on the bottom surface 11a of the groove 11. Thereby, it can prevent that the burr | flash V generate | occur | produces in the back surface 1c of 1 A of 1st metal members, and the back surface 2c of 2 A of 2nd metal members. Therefore, surface treatments such as a deburring process for the first metal member 1A and the second metal member 2A can be omitted.

  Moreover, according to the joining method which concerns on this embodiment, since the shoulder part G1 is not pushed in into the bottom face 10a of the ditch | groove 10, and the bottom face 11a of the ditch | groove 11, the load concerning a friction stirring apparatus can be made small. Further, by overlapping the plasticizing region W1 formed in the first friction stirring step and the plasticizing region W2 formed in the second friction stirring step, the total length in the depth direction of the butt J is friction stir. Therefore, joint strength can be increased, and water tightness and air tightness can be enhanced. Moreover, since the height dimension of the tab material T is made equal to the plate thickness dimension of the outer end faces 1d, 2d, the tab material T can handle both the first friction agitation process and the second friction agitation process. Can do.

DESCRIPTION OF SYMBOLS 1 1st metal member 1b Surface 1c Back surface 1c Outer end surface 1e Inner end surface 1f Intermediate surface 1g Inner end surface 1h Intermediate surface 2 Second metal member 2b Surface 2c Back surface 2d Outer end surface 2e Inner end surface 2f Intermediate surface 2g Inner end surface 2h Intermediate surface 10 Concave Groove 11 Concave groove J Butt part G Rotating tool G1 Shoulder part G2 Stirring pin W Plasticization area W1 Plasticization area W2 Plasticization area

Claims (6)

A joining method for friction stir welding between metal members,
The end surfaces facing each other between the metal members are an outer end surface formed on the back surface side, an inner end surface formed on the surface side and formed on a side away from the metal member facing the outer end surface, Forming an outer end face and an intermediate face connecting the inner end face,
Abutting step of abutting the outer end surfaces of the metal member to form a butting portion and forming a concave groove formed by the intermediate surfaces and the inner end surfaces;
Including a friction stirring step of inserting a rotating tool from the surface side of the metal members and performing friction stir welding to the butt portion,
The rotating tool has a shoulder portion that has a cylindrical shape and a stirring pin that hangs down from the shoulder portion, and sets the diameter of the shoulder portion to be smaller than the width of the concave groove,
The stirring pin is tapered,
In the friction stirring step, the shoulder portion of the rotating tool is inserted into the concave groove, and the shoulder portion is separated from the bottom surface of the concave groove. The joining method is characterized by depositing burrs in a space constituted by the bottom surface of the concave groove, both side walls of the concave groove, and the lower end surface of the shoulder portion by friction stir welding the butt portion while pressing. . A joining method for friction stir welding between metal members,
The end face of the metal members is formed on both the outer end face formed at the center in the plate thickness direction and on the front side and the back side with respect to the outer end face, and the metal member is opposed to the outer end face. And a pair of inner end surfaces formed on the side to be separated, and a pair of intermediate surfaces respectively connecting the outer end surface and the pair of inner end surfaces,
A pair of concave grooves that are formed on the front surface side and the back surface side of the metal members and configured by the intermediate surfaces and the inner end surfaces, while abutting portions are formed by abutting the outer end surfaces of the metal members. A butt process to form
A first friction agitation step of inserting a rotary tool from the surface side of the metal members and performing friction agitation joining to the butt portion;
Including a second friction stir step for inserting a rotating tool from the back side of the metal members and performing friction stir welding on the butt portion,
The rotating tool has a shoulder portion that has a cylindrical shape and a stirring pin that hangs down from the shoulder portion, and sets the diameter of the shoulder portion to be smaller than the width of the concave groove,
The stirring pin is tapered,
In the first friction agitation step and the second friction agitation step, each shoulder part of the rotary tool is inserted into the concave groove, and the shoulder part is separated from the bottom surface of the concave groove. A space formed by the bottom surface of the concave groove, both side walls of the concave groove, and the lower end surface of the shoulder portion by friction stir welding of the butt portion while holding the burr generated from the metal member by the shoulder portion. A bonding method characterized by depositing burrs on the substrate .   The joining method according to claim 2, wherein the plasticizing region formed in the first friction stirring step overlaps the plasticizing region formed in the second friction stirring step. Including a tab material arranging step of arranging tab materials at both ends of the abutting part,
4. The friction stirring step includes providing a friction stirring start point on one tab material and providing a friction stirring end point on the other tab material. 5. Joining method. A spiral groove is formed on the outer peripheral surface of the stirring pin,
When the spiral groove of the stirring pin is formed counterclockwise as it goes from the proximal end of the stirring pin to the distal end, the rotating tool is rotated clockwise, and the spiral groove of the stirring pin is moved from the proximal end of the stirring pin to the distal end. 5. The joining method according to claim 1, wherein when the rotation tool is formed clockwise, the rotation tool is rotated counterclockwise. The joining method according to any one of claims 1 to 5, wherein the first metal member and the second metal member are formed of aluminum or an aluminum alloy.

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