JP2018001216A - Welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method capable of preventing burrs from being produced on the outer peripheral faces of the first and second metallic components.SOLUTION: A welding method includes: an overlapping process of forming an overlapping part J1 in a circumferential direction by overlapping the end of a first columnar metallic component 1a and that of a second columnar or cylindrical metallic component 1b, and forming a recessed groove 10 along the overlapping part J1 between the first and second metallic components 1a and 1b; and a friction stirring process of performing friction stir welding of the overlapping part J1 using a rotary tool G for welding. In the welding method, a diameter of a shoulder part G1 is set to be smaller than a width of the recessed groove 10, and in the friction stir welding process, the shoulder part G1 of the rotary tool G for welding is inserted into the recessed groove 10, and in a state that the shoulder part G1 is separated from the bottom face of the recessed groove 10, while pressing burrs V produced from the recessed groove 10 by the shoulder part G1, the friction stir welding of the overlapping part J1 is carried out.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a joining method.

  Patent Document 1 discloses a joining method in which friction stir welding is performed using a rotary tool to a butting portion formed by butting a columnar member and a cylindrical member at end surfaces. In the joining method, only the stirring pin of the rotary tool is brought into contact with the metal member to be joined and joined.

JP2015-131322A

  In the conventional joining method, there exists a problem that a burr | flash generate | occur | produces on the outer peripheral surface of a to-be-joined metal member, and the process of removing the said burr | flash becomes complicated.

  Then, this invention makes it a subject to provide the joining method which can prevent generating a burr | flash on the outer peripheral surface of a 1st metal member and a 2nd metal member.

  In order to solve such a problem, the present invention forms an overlapped portion in the circumferential direction by overlapping the end portion of the first metal member having a columnar shape and the end portion of the columnar or cylindrical second metal member. And the superposition | polymerization process which forms the ditch | groove along the said superposition | polymerization part between said 1st metal member and said 2nd metal member, and the friction stir process which performs friction stir welding with respect to the said superposition | polymerization part using a rotary tool The rotating tool includes a shoulder portion having a columnar shape, and a stirring pin hanging from the shoulder portion, the diameter of the shoulder portion is set smaller than the width of the concave groove, and the friction In the stirring step, the shoulder portion of the rotating tool is inserted into the concave groove, and while the shoulder portion is spaced from the bottom surface of the concave groove, the burr generated from the concave groove is pressed by the shoulder portion, The rotating tool in the circumferential direction Characterized by friction stir welding the overlapped portion by pairs move.

  In addition, the present invention provides an overlapping portion in the circumferential direction by overlapping the end portion of the cylindrical first metal member and the end portion of the cylindrical second metal member, and the first metal member A rotation step including forming a concave groove along the overlapping portion between the second metal member and a friction stirring step of performing friction stir welding on the overlapping portion using a rotating tool, the rotating tool Includes a shoulder portion having a cylindrical shape and a stirring pin depending from the shoulder portion, the diameter of the shoulder portion is set smaller than the width of the concave groove, and in the friction stirring step, With the shoulder portion inserted into the concave groove, the burr generated from the concave groove is pressed by the shoulder portion while the shoulder portion is separated from the bottom surface of the concave groove, and the rotating tool is relatively moved in the circumferential direction. The superposition part is moved to friction stir Characterized by bonding.

  Further, the present invention is configured to abut the end portion of the first metal member having a columnar shape and the end portion of the columnar or cylindrical second metal member to form a butt portion in the circumferential direction, and A rotating step including a butting step of forming a concave groove along the butting portion between the second metal member and a friction stirring step of performing a friction stir welding to the butting portion using a rotating tool; Includes a shoulder portion having a cylindrical shape and a stirring pin depending from the shoulder portion, the diameter of the shoulder portion is set smaller than the width of the concave groove, and in the friction stirring step, With the shoulder portion inserted into the concave groove, the burr generated from the concave groove is pressed by the shoulder portion while the shoulder portion is separated from the bottom surface of the concave groove, and the rotating tool is relatively moved in the circumferential direction. Move forward Characterized by friction stir welding the butted portion.

  Further, the present invention is configured to abut the end portion of the first metal member having a shape and the end portion of the cylindrical second metal member to form a butt portion in the circumferential direction, and to connect the first metal member and the first metal member. Including a butting step of forming a concave groove along the butting portion between two metal members, and a friction stirring step of performing friction stir welding to the butting portion using a rotating tool, A shoulder portion having a columnar shape, and a stirring pin depending from the shoulder portion, wherein the diameter of the shoulder portion is set to be smaller than the width of the concave groove, and in the friction stirring step, the shoulder portion of the rotary tool Is inserted into the groove, and the rotary tool is moved relative to the circumferential direction while pressing the burr generated from the groove with the shoulder while the shoulder is separated from the bottom surface of the groove. The butt section Characterized by friction stir welding.

  According to this joining 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. be able to. Thereby, it can prevent that a burr | flash generate | occur | produces on the outer peripheral 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.

  According to the joining method according to the present invention, it is possible to prevent burrs from being generated on the outer peripheral surfaces of the first metal member and the second metal member.

It is a perspective view which shows the 1st metal member and 2nd metal member of the joining method which concern on 1st embodiment of this invention. It is sectional drawing which shows the superposition | polymerization process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the friction stirring process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the 1st metal member and 2nd metal member of the joining method which concern on the modification of 1st embodiment. It is sectional drawing which shows the superposition | polymerization process of the joining method which concerns on the modification of 1st embodiment. It is a perspective view which shows the 1st metal member and 2nd metal member of the joining method which concern on 2nd embodiment of this invention. It is sectional drawing which shows the butt | matching process of the joining method which concerns on 2nd embodiment. It is a perspective view which shows the friction stirring process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the friction stirring process of the joining method which concerns on 2nd embodiment. It is a perspective view which shows the 1st metal member and 2nd metal member of the modification which concern on 2nd embodiment. It is sectional drawing which shows the matching process of the modification which concerns on 2nd embodiment.

[First embodiment]
A first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the joining method according to the present embodiment is one in which the ends of the first metal member 1a and the second metal member 1b are overlapped and friction stir welded. The joining method according to the present embodiment performs a polymerization process and a friction stirring process.

  As shown in FIG. 1, the first metal member 1 a is a metal member having a substantially columnar shape, and includes a large diameter portion 2 and a small diameter portion 3 having a columnar shape formed on the end surface 11 a of the large diameter portion 2. Have The large diameter portion 2 and the small diameter portion 3 are formed by concentric shafts. The end surface 11 a of the large diameter portion 2 is formed at a position lower than the end surface 14 a of the small diameter portion 3.

  The second metal member 1 b is a metal member having a cylindrical shape, and includes a cylindrical large-diameter portion 4 and a cylindrical small-diameter portion 5 formed on the end surface 11 b of the large-diameter portion 4. The small diameter portion 5 of the second metal member 1b and the large diameter portion 4 of the first metal member 1a have the same height. The large diameter portion 4 and the small diameter portion 5 are formed by concentric shafts. The end surface 11 b of the large diameter portion 4 is formed at a position lower than the end surface 15 b of the small diameter portion 5. The first metal member 1a and the second metal member 1b have substantially the same outer diameter, and the outer diameter of the small diameter portion 3 of the first metal member 1a and the inner diameter of the second metal member 1b are formed to be substantially equal. Yes.

  In the present embodiment, the first metal member 1a and the second metal member 1b are metal materials having the same composition, for example, friction such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. It is made of a stirrable metal material.

  As shown in FIG. 2, the superposition step is a step of forming the superposition portion J <b> 1 and the groove 10 by overlapping the end portions while abutting the first metal member 1 a and the second metal member 1 b. That is, by inserting the small diameter portion 3 of the first metal member 1a into the second metal member 1b, the outer peripheral surface 13a of the small diameter portion 3 of the first metal member 1a and the inner peripheral surface of the second metal member 1b. 13b is overlapped to form the overlapping portion J1, and the concave groove 10 is formed along the overlapping portion J1. The concave groove 10 is a groove having a rectangular cross section with the outer peripheral surface 14b of the small diameter portion 5 as a bottom surface and the end surfaces 11a and 11b as side walls. The concave groove 10 is continuously formed in the circumferential direction.

  As shown in FIGS. 3 and 4, the friction stirring step is a step of performing friction stir welding of the overlapping portion J <b> 1 using the rotating tool G for bonding. The joining rotary tool G is composed of a shoulder part G1 and a stirring pin G2. The joining rotary tool G corresponds to a “rotary tool” in the claims. The joining rotary tool G is made of, for example, tool steel. The shoulder part G1 is a part connected to the rotating shaft of the friction stirrer. The shoulder portion G1 has a cylindrical shape. The outer diameter of the shoulder portion G <b> 1 is smaller than the width of the groove 10 so that it can be inserted into the groove 10.

  As shown in FIG. 4, the stirring pin G <b> 2 hangs down from the shoulder part G <b> 1 and is coaxial with the shoulder part G <b> 1. The stirring pin G2 is tapered as it is separated from the shoulder portion G1. The length of the stirring pin G2 is larger than the plate thickness of the small diameter portion 5 of the second metal member 1b. A spiral groove is formed on the outer peripheral surface of the stirring pin G2. In the present embodiment, the spiral groove is formed counterclockwise from the proximal end toward the distal end in order to rotate the joining rotary tool G to the right.

  In addition, when rotating the rotation tool G for joining counterclockwise, it is preferable to form a spiral groove clockwise as it goes to the front-end | tip from a base 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 G2 by the spiral groove. Thereby, the quantity of the metal which overflows outside the outer peripheral surface 14b in the case of a friction stirring process can be decreased.

  In the friction agitation step, as shown in FIG. 3, the rotating tool G for bonding rotated to the start position Sp set on the bottom surface (outer peripheral surface 14b) of the groove 10 is inserted, and friction is applied to the overlapping portion J1. Stir welding is performed. In the friction stirring step, the bonding rotary tool G may be moved along the periphery of the first metal member 1a and the second metal member 1b. However, in this embodiment, the position of the bonding rotary tool G is fixed. The first metal member 1a and the second metal member 1b are simultaneously rotated in the circumferential direction to perform friction stir welding.

  The insertion depth of the joining rotary tool G may be set as appropriate, but in this embodiment, the stirring pin G2 reaches the first metal member 1a, that is, the first metal member 1a and the second metal member 1b. Friction stir welding is performed in a state where the agitator pin G2 is in contact with the agitator pin G2. A plasticized region W1 is formed on the movement trajectory of the welding rotary tool G.

  Further, in the friction stirring step, as shown in FIG. 4, the lower end surface G1a of the shoulder portion G1 is separated from the bottom surface (outer peripheral surface 14b) of the concave groove 10, and the outer peripheral surface 12a of the first metal member 1a and the first It is set at a position lower than the outer peripheral surface 12b of the bimetallic member 1b. 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 from the bottom surface (outer peripheral surface 14b) of the concave groove 10 before the burr V is generated. This means that they are separated. Further, in the claims, “while pressing the burr generated from the concave groove with the shoulder portion”, the accumulated burr V and the lower end face G1a of the shoulder portion G1 are in contact with each other, 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.

  Moreover, the outer peripheral surface of the shoulder part G1 and the side wall (end surface 11a, 11b) of the ditch | groove 10 are spaced apart with a slight gap. A narrow space is formed on the bottom surface (outer peripheral surface 14b) of the concave groove 10, the side walls (end surfaces 11a, 11b) of the concave groove 10, and the lower end surface G1a of the shoulder portion G1.

  The stirring pin G2 may be set so as not to reach the first metal member 1a. That is, in the friction stirring step, the insertion depth of the stirring pin G2 may be set so that only the second metal member 1b and the stirring pin G2 are in contact with each other. Thus, when setting so that the front-end | tip of the stirring pin G2 may not reach the 1st metal member 1a, the metal around the superposition | polymerization part J1 plastically fluidized by the frictional heat of the 2nd metal member 1b and the stirring pin G2. The first metal member 1a and the second metal member 1b are joined together.

  A burr V is generated on the bottom surface (outer peripheral surface 14b) of the groove 10 by the friction stir process, and is constituted by the bottom surface of the groove 10, the side walls (end surfaces 11a, 11b) of the groove 10, and the lower end surface G1a of the shoulder portion G1. The burr V is confined in a narrow space (closed space having a rectangular cross section), and the burr V accumulates in the concave groove 10. 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.

  According to the joining method according to the present embodiment described above, when the friction stirring step is performed, the bottom surface (outer peripheral surface 14b) of the concave groove 10, the side walls (end surfaces 11a and 11b) of the concave groove 10, and the bottom of the shoulder portion G1. Since a narrow space is formed on the end face G1a, it is possible to prevent the burrs V from scattering and to deposit the burrs V on the bottom surface of the concave groove 10. Thereby, it can prevent that the burr | flash V generate | occur | produces in the outer peripheral surface 12a of the 1st metal member 1a, and the outer peripheral surface 12b of the 2nd metal member 1b. Therefore, surface treatments such as a burr removing step on the outer peripheral surface 12a of the first metal member 1a and the outer peripheral surface 12b of the second metal member 1b can be omitted.

  In addition, according to the joining method according to the present embodiment, since the shoulder portion G1 is not pushed into the bottom surface (outer peripheral surface 14b) of the groove 10, the overlapping portion J1 located in a deep position with a small load on the friction stirrer. Can be joined.

  In addition, before performing a friction stirring process, you may perform the temporary joining process of temporarily joining superposition | polymerization part J1 comprised with the 1st metal member 1a and the 2nd metal member 1b. In the temporary joining step, for example, the overlapping portion J1 may be joined continuously or intermittently (spot temporary attachment) using a rotating tool. Thereby, in the case of a friction stirring process, the 1st metal member 1a and the 2nd metal member 1b can be easily rotated integrally.

[Modification of First Embodiment]
FIG. 5 is a perspective view showing a first metal member and a second metal member of the joining method according to the modification of the first embodiment. FIG. 6 is a cross-sectional view showing a polymerization process of the joining method according to the modification of the first embodiment. The overlapping of the end portion of the first metal member and the end portion of the second metal member is not limited to the first embodiment, and may be set as appropriate.

  As shown in FIG. 5, in the modification of 1st embodiment, the 1st metal member 1c and the 2nd metal member 1b are joined. The second metal member 1b is the same as in the first embodiment. The second metal member 1 c has a large diameter portion 4 and a cylindrical small diameter portion 5 formed on the end surface 11 c of the large diameter portion 4. The small diameter portion 5 is formed at the center of the end face 11c in the thickness direction. The end surface 11 c of the large diameter portion 4 is formed at a position lower than the end surface 15 c of the small diameter portion 5. The height dimensions of the small diameter portions 5 and 5 are the same.

  As shown in FIG. 6, the superposition step is a step in which the first metal member 1 c and the second metal member 1 b are abutted and the end portions are overlapped to form the superposition portion J2 and the groove 10. That is, by inserting the small diameter portion 5 of the second metal member 1b into the small diameter portion 5 of the first metal member 1c, the inner peripheral surface 16c of the small diameter portion 5 of the first metal member 1c and the second metal member The overlapping portion J2 is formed by overlapping the outer peripheral surface 14b of the small-diameter portion 5 of 1b, and the concave groove 10 is formed along the overlapping portion J2. The concave groove 10 is a groove having a rectangular section with the outer peripheral surface 14c of the small diameter portion 5 as a bottom surface and the end surfaces 11a and 11b as side walls. The concave groove 10 is continuously formed in the circumferential direction.

  The friction stir process according to the modified example is the same as that of the first embodiment, and thus the description thereof is omitted. The same effect as that of the first embodiment can also be achieved by this modification. As in the modified example, the overlapped portion formed by overlapping the end portions of the cylindrical member may be joined.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. As shown in FIG. 7, the joining method according to the second embodiment is a step of joining the first metal member 1a and the second metal member 1a. In the joining method according to the second embodiment, a butt process and a friction stirring process are performed.

  In the butting step, as shown in FIG. 8, the first metal member 1a and the second metal member 1a are butted to form a butting portion J3, and the concave groove 10 is formed along the butting portion J3. The butting portion J3 is formed by butting the end surfaces 14a and 14a of the small diameter portions 3 and 3. The concave groove 10 is a groove having a rectangular cross section with the outer peripheral surfaces 13a and 13a of the small diameter portion 3 as bottom surfaces and the end surfaces 11a and 11b as side walls. The concave groove 10 is continuously formed in the circumferential direction.

  As shown in FIGS. 9 and 10, the friction stirring step is a step of friction stir welding the butt portion J <b> 3 using the rotating tool G for bonding. In the friction stirring step, as shown in FIG. 9, the rotating tool G for bonding rotated to the start position Sp set on the bottom surface (outer peripheral surfaces 13a, 13a) of the concave groove 10 is inserted, and the butt portion J3 is inserted. Friction stir welding is performed. In the friction stirring step, the bonding rotary tool G may be moved along the periphery of the first metal member 1a and the second metal member 1a, but in this embodiment, the position of the bonding rotary tool G is fixed. The first metal member 1a and the second metal member 1a are simultaneously rotated in the circumferential direction to perform friction stir welding. A plasticized region W3 is formed on the movement locus of the welding rotary tool G (see FIG. 10).

  In the friction stirring step, as shown in FIG. 10, the lower end surface G1a of the shoulder portion G1 is separated from the bottom surface (outer peripheral surfaces 13a, 13a) of the concave groove 10, and the outer peripheral surface 12a of the first metal member 1a. And it is set to a position lower than the outer peripheral surface 12a of the second metal member 1a. 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 refers to the lower end surface of the shoulder portion G1 from the bottom surface (outer peripheral surfaces 13a, 13a) before the burr V is generated. This means that G1a is separated. Further, in the claims, “while pressing the burr generated from the concave groove with the shoulder portion”, the accumulated burr V and the lower end face G1a of the shoulder portion G1 are in contact with each other, 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.

  Moreover, the outer peripheral surface of the shoulder part G1 and the side wall (end surface 11a, 11b) of the ditch | groove 10 are spaced apart with a slight gap. A narrow space is formed by the bottom surface (outer peripheral surfaces 13a, 13a) of the concave groove 10, the side walls (end surfaces 11a, 11b) of the concave groove 10, and the lower end surface G1a of the shoulder portion G1.

  The burr V is generated on the bottom surface (outer peripheral surfaces 13a, 13a) of the groove 10 by the friction stirring process. The burr V is confined in the narrow space (closed space having a rectangular cross section), and the burr V is deposited in the concave groove 10. 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.

  According to the joining method according to the present embodiment described above, the bottom surface (outer peripheral surfaces 13a and 13a) of the concave groove 10, the side walls (end surfaces 11a and 11b) of the concave groove 10, and the shoulder portion G1 when performing the friction stirring step. Since a narrow space is formed at the lower end surface G1a of the burrs, it is possible to prevent the burrs V from being scattered and to deposit the burrs V on the bottom surfaces of the grooves 10. Thereby, it can prevent that the burr | flash V generate | occur | produces in the outer peripheral surface 12a of the 1st metal member 1a, and the outer peripheral surface 12a of the 2nd metal member 1a. Therefore, surface treatments such as a burr removing step on the outer peripheral surface 12a of the first metal member 1a and the outer peripheral surface 12a of the second metal member 1a can be omitted.

  Further, according to the joining method according to the present embodiment, since the shoulder portion G1 is not pushed into the bottom surfaces (outer peripheral surfaces 13a, 13a) of the groove 10, the butt portion J3 is deep in a state where the load applied to the friction stirrer is small. The position can be joined.

  In addition, before performing a friction stirring process, you may perform the temporary joining process of temporarily joining the butt | matching part J3 comprised with the 1st metal member 1a and the 2nd metal member 1a. In the temporary joining step, for example, the abutting portion J3 may be joined using a rotating tool or by welding continuously or intermittently (spot tacking). Thereby, in the case of a friction stirring process, the 1st metal member 1a and the 2nd metal member 1a can be easily rotated integrally.

[Modification of Second Embodiment]
FIG. 11 is a perspective view showing a first metal member and a second metal member of a modification according to the second embodiment. FIG. 12 is a cross-sectional view showing a butting process of a modification according to the second embodiment. The end portion of the first metal member and the end portion of the second metal member may be appropriately set.

  As shown in FIG. 11, in the modification of the second embodiment, the first metal member 1d and the second metal member 1b are joined. The second metal member 1b is the same as in the first embodiment. The first metal member 1 d has a large diameter portion 6, a medium diameter portion 7 formed on the end surface 11 d of the large diameter portion 6, and a small diameter portion 8 formed on the end surface 15 d of the medium diameter portion 7. The medium diameter portion 7 and the small diameter portion 8 are formed with the same central axis as the large diameter portion 6. The height dimension of the small diameter part 8 is the same as the height dimension of the small diameter part 5 of the second metal member 1b.

  As shown in FIG. 12, the butting step is a step of butting the first metal member 1d and the second metal member 1b to form the butting portion J4 and the groove 10. That is, by inserting the small diameter portion 8 of the first metal member 1d into the second metal member 1b, the end surface 15d of the medium diameter portion 7 and the end surface 15b of the small diameter portion 5 are abutted to form the abutting portion J4. At the same time, the concave groove 10 is formed. The concave groove 10 is a groove having a rectangular section with the outer peripheral surface 14d of the medium diameter portion 7 and the outer peripheral surface 14b of the small diameter portion 5 as bottom surfaces and the end surfaces 11d and 11b as side walls. The concave groove 10 is continuously formed in the circumferential direction.

  The friction stirrer process according to the modification is the same as that of the second embodiment, and a description thereof will be omitted. The same effect as that of the second embodiment can be achieved by this modification. You may join the butt | matching part formed by butting | matching the edge parts of a columnar member and a cylindrical member like the said modification.

  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, in the polymerization step shown in FIG. 2, the second metal member 1b may be superposed as a columnar metal member. In the butting process shown in FIG. 7, only the second metal member 1a may be a cylindrical member, or both the first metal member 1a and the second metal member 1b may be cylindrical members.

  In this embodiment, the cylindrical or cylindrical members are joined to each other, but members having other cross-sectional shapes such as a cross-sectional ellipse or a cross-sectional angular shape may be joined. In addition, the end surfaces of the first metal member and the second metal member may be overlapped or butted together by appropriately providing a step.

DESCRIPTION OF SYMBOLS 1a 1st metal member 1b 2nd metal member 10 Concave groove G Joining rotation tool (rotary tool)
G2 Stirring pin J1 Butt part V Burr W1 Plasticization region

Claims (4)

The first metal member and the second metal member are formed by overlapping an end portion of the first metal member having a columnar shape and an end portion of the columnar or cylindrical second metal member to form a superposed portion in the circumferential direction. A polymerization step of forming a concave groove along the overlapping portion between,
A friction stir process for performing friction stir welding on the overlapping portion using a rotating tool,
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,
In the friction stir step, the shoulder portion of the rotary tool is inserted into the concave groove, and the burr generated from the concave groove is pressed by the shoulder portion with the shoulder portion being separated from the bottom surface of the concave groove. While, the rotating tool is relatively moved in the circumferential direction, and the overlapping portion is friction stir welded. An overlapping portion is formed in the circumferential direction by overlapping the end portion of the first metal member having a cylindrical shape and the end portion of the cylindrical second metal member, and the first metal member and the second metal member A polymerization step of forming a concave groove along the overlapping portion between,
A friction stir process for performing friction stir welding on the overlapping portion using a rotating tool,
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,
In the friction stir step, the shoulder portion of the rotary tool is inserted into the concave groove, and the burr generated from the concave groove is pressed by the shoulder portion with the shoulder portion being separated from the bottom surface of the concave groove. While, the rotating tool is relatively moved in the circumferential direction, and the overlapping portion is friction stir welded. The end portion of the first metal member having a columnar shape and the end portion of the columnar or cylindrical second metal member are abutted to form a butt portion in the circumferential direction, and the first metal member and the second metal member are A butting step of forming a concave groove along the butting portion between,
A friction stir process for performing friction stir welding on the butt portion using a rotary tool,
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,
In the friction stir step, the shoulder portion of the rotary tool is inserted into the concave groove, and the burr generated from the concave groove is pressed by the shoulder portion with the shoulder portion being separated from the bottom surface of the concave groove. While, the rotating tool is relatively moved in the circumferential direction, and the butt portion is friction stir welded. The end portion of the cylindrical first metal member and the end portion of the cylindrical second metal member are abutted to form a butt portion in the circumferential direction, and the first metal member and the second metal member A butting step of forming a concave groove along the butting portion in between,
A friction stir process for performing friction stir welding on the butt portion using a rotary tool,
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,
In the friction stir step, the shoulder portion of the rotary tool is inserted into the concave groove, and the burr generated from the concave groove is pressed by the shoulder portion with the shoulder portion being separated from the bottom surface of the concave groove. While, the rotating tool is relatively moved in the circumferential direction, and the butt portion is friction stir welded.

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