JP6747365B2 - Joining method - Google Patents

Description

The present invention relates to a joining method for joining metallic members by friction stir welding.

For example, Patent Document 1 discloses a joining method of joining a first metal member and a second metal member by friction stirring. In the joining method, after the first metal member and the second metal member are butted against each other to form the butted portion, only the stirring pin of the rotating tool is brought into contact with the butted portion in the first and second metallic members. On the other hand, friction stirring is performed.

JP, 2013-039613, A

However, in the above-described conventional joining method, since the plasticized metal is not pressed by the shoulder portion of the rotary tool, there is a problem that the plasticized metal leaks to the outside and the joining portion becomes insufficient.

Therefore, it is an object of the present invention to provide a joining method capable of preventing a metal shortage at a joining portion.

The present invention is a joining method for joining a first metal member and a second metal member by friction stir welding using a rotary tool for main joining equipped with a stir pin, wherein the first metal member has a plate shape. The second metal member is formed in an L-shaped cross section in which a horizontal plate is projected from a base end portion on one side surface side of a vertical plate, and the side surface of the first metal member and the second metal member are formed. A butting step of butting the other side surface of the vertical plate to form a butting portion, and the butting step including the side surface of the first metal member and the base end portion of the second metal member after the butting step. So as to cover the part, an auxiliary member arranging step of bringing the back surface of the auxiliary member into surface contact with the lateral plate of the second metal member, and after the auxiliary member arranging step, the stirring pin is inserted from the front surface side of the auxiliary member, In a state where only the stirring pin is in contact with the auxiliary member, the first metal member and the second metal member, the main joining rotary tool is relatively moved along the abutting portion, and the auxiliary member, A main joining step of performing friction stir welding of the first metal member and the second metal member, and a removing step of removing the auxiliary member having burrs formed from the second metal member after the main joining step. Is characterized by.
Another aspect of the present invention is a joining method for joining a first metal member and a second metal member by friction stir welding using a rotary tool for main joining provided with a stirring pin, wherein the first metal member is a plate. The second metal member is formed in an L-shaped cross section in which a horizontal plate projects from a base end portion on one side surface side of a vertical plate, and the side surface of the first metal member and the second metal member are formed. A butting step of forming a butt portion by abutting the other side surface of the vertical plate of the member, and a side surface of the first metal member and the base end portion of the second metal member after the butting step. An auxiliary member disposing step of bringing the back surface of the auxiliary member into surface contact with the side surface of the first metal member so as to cover the butting portion, and after the auxiliary member disposing step, the stirring pin is inserted from the front surface side of the auxiliary member. Then, in a state where only the stirring pin is in contact with the auxiliary member, the first metal member and the second metal member, the main joining rotary tool is relatively moved along the abutting portion to obtain the auxiliary member. A main joining step of performing friction stir welding of the first metal member and the second metal member, and a removing step of removing the auxiliary member having burrs formed from the first metal member after the main joining step. It is characterized by including.

According to each of the above-mentioned inventions, the first metal member and the second metal member are joined together, and in addition to the first metal member and the second metal member, the auxiliary member is also subjected to friction stir welding at the same time. The metal shortage can be prevented.

Further, since the burr generated by the friction stir welding can be removed together with the auxiliary member from the metal member, the step of removing the burr becomes easy.

Prior to the auxiliary member arranging step, friction stirring is performed by inserting only the stirring pin of the rotary tool for temporary joining into the butt portion formed by the side surface of the first metal member and the base end portion of the second metal member. It is preferable to include a temporary joining step of performing spot joining by joining.

Before the auxiliary member arranging step, friction is caused by inserting only the stirring pin of the rotary tool for temporary joining into the butt portion formed by the tip of the first metal member and the tip of the vertical plate of the second metal member. It is preferable to include a temporary joining step of performing spot joining by stirring joining.

According to such a joining method, the load acting on the friction stirrer can be reduced by temporarily spot-attaching the abutting portion while only the stirring pin is in contact with the metal member. In addition, the process time can be shortened as compared with the conventional case where the temporary joining is performed for the entire length of the abutting portion.

In this case, the rotary tool for temporary joining and the rotary tool for main joining are preferably the same rotary tool. According to such a joining method, since it is not necessary to replace the rotary tool, it is possible to improve work efficiency.

Prior to the auxiliary member arranging step, it is preferable to include a temporary joining step of spot joining by welding to the abutting portion formed by the side surface of the first metal member and the base end portion of the second metal member. In this case, the welding is preferably MIG welding, TIG welding or laser welding.

Before the auxiliary member arranging step, it is preferable to include a temporary joining step of performing spot joining by welding to the butt portion formed by the tip of the first metal member and the tip of the vertical plate of the second metal member. .. In this case, the welding is preferably MIG welding, TIG welding or laser welding.
According to such a joining method, the process time can be shortened as compared with the conventional case where the temporary joining is performed for the entire length of the abutting portion.

According to the present invention, it is possible to provide a joining method capable of preventing a metal shortage at a joining portion.

It is a perspective view of the 1st metal member and the 2nd metal member explaining the butting process of the joining method concerning a first embodiment of the present invention. It is a longitudinal cross-sectional view of the state which the 1st metal member and the 2nd metal member were match|combined, explaining the butt|matching process of the joining method which concerns on 1st embodiment of this invention. It is a perspective view explaining the temporary joining process of the joining method concerning a first embodiment of the present invention. It is a perspective view explaining the temporary joining process of the joining method concerning a first embodiment of the present invention. It is a perspective view explaining the auxiliary member arrangement process of the joining method concerning a first embodiment of the present invention. It is a longitudinal section explaining an auxiliary member arrangement process of a joining method concerning a first embodiment of the present invention. It is a perspective view explaining the main joining process of the joining method concerning a first embodiment of the present invention. It is a longitudinal section explaining the main joining process of the joining method concerning a first embodiment of the present invention. It is a longitudinal section explaining a removal process of a joining method concerning a first embodiment of the present invention. It is a perspective view explaining the auxiliary member arrangement process of the joining method concerning a second embodiment of the present invention. It is a longitudinal section explaining an auxiliary member arrangement process of a joining method concerning a second embodiment of the present invention. It is a perspective view explaining the main joining process of the joining method concerning a second embodiment of the present invention. It is a perspective view explaining the temporary joining process of the joining method concerning a third embodiment of the present invention. It is a perspective view explaining the temporary joining process of the joining method concerning a third embodiment of the present invention.

[First embodiment]
The joining method according to the first embodiment of the present invention will be described in detail with reference to FIGS. In the first embodiment, the plate-shaped first metal member and the second metal member having an L-shaped cross section are joined. In the joining method according to the first embodiment, a butting step, a temporary joining step, an auxiliary member disposing step, a main joining step, and a removing step are performed. In the following description, "front surface" means the surface opposite to the "back surface".

As shown in FIG. 1, the abutting step is a step of abutting the plate-shaped first metal member 10 and the second metal member 20 having an L-shaped cross section.
The materials of the first metal member 10 and the second metal member 20 are appropriately selected from friction stirrable metals such as aluminum, aluminum alloys, copper, copper alloys, titanium, titanium alloys, magnesium and magnesium alloys.

The first metal member 10 has, for example, a rectangular flat plate shape. The first metal member 10 may be a plate material having another shape.
The second metal member 20 is a shape member having an L-shaped axial cross section. The second metal member 20 is composed of a vertical plate 21 and a horizontal plate 23 protruding toward one side from a base end portion 22 on the side surface 21a side of the vertical plate 21. That is, the horizontal plate 23 is bent at a right angle from the base end portion 22 (the upper end portion side of the vertical plate 21 in FIG. 1) of the vertical plate 21 toward one side.

At the connecting portion between the vertical plate 21 and the horizontal plate 23, as shown in FIG. 2, a corner portion 24 bent at a right angle is formed. A curved surface curved in an arc shape is formed on the outer top of the corner portion 24.
In the second metal member 20 of the first embodiment, the height of the vertical plate 21 and the horizontal width of the horizontal plate 23 are formed to have the same length, but they may be formed to have different lengths.
By the abutting step, the side surface 10a of the both side surfaces 10a and 10b of the first metal member 10 and the other side surface 21b of the vertical plate 21 of the second metal member 20 are brought into surface contact with each other.

In this example, since the first metal member 10 and the second metal member 20 have the same length (depth dimension), the lateral end surface 10c of the first metal member 10 and the lateral end surface 25a of the second metal member 20. Are flush with each other, and the end face 10d and the end face 25b are also flush with each other. Further, the lower end face 10e of the first metal member 10 and the lower end face 21c of the vertical plate 21 of the second metal member 20 are aligned so as to be flush with each other. The length (depth dimension) of the first metal member 10 and the second metal member 20 may not be equal.

FIG. 2 is a vertical cross-sectional view of the first metal member 10 and the second metal member 20 that are butted in this way. The side surface 10a of the first metal member 10 and the base end portion 22 of the second metal member 20 form a butt portion J1.

At this time, since a curved surface curved in an arc shape is formed on the outer top of the corner portion 24, between the side surface 10a of the first metal member 10 and the corner portion 24 of the second metal member 20, A substantially V-shaped gap S is formed.
Further, the end face 10e of the first metal member 10 and the end face 21c of the vertical plate 21 of the second metal member 20 form a butt portion J2.

After the butting process, a temporary joining process is performed. As shown in FIGS. 3 and 4, the temporary joining step is a step of performing temporary joining to the abutting portions J1 and J2 using a rotary tool (rotary tool for temporary joining) F.
The rotary tool F is made of, for example, tool steel. The rotary tool F includes a connecting portion F1 and a stirring pin F2. The connecting portion F1 is a portion connected to the rotary shaft of the friction stirrer. The connecting portion F1 has a cylindrical shape.

The stirring pin F2 extends 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. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the first embodiment, since the rotary tool F is rotated clockwise, the spiral groove is formed counterclockwise from the base end toward the tip.

When the rotary tool F is rotated counterclockwise, it is preferable to form the spiral groove clockwise from the base end toward the tip.
By setting the spiral groove in this way, the metal that has been plastically fluidized during frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the amount of metal overflowing to the outside of the first metal member 10 and the second metal member 20 can be reduced. The spiral groove may be omitted.

In the temporary joining step of the abutting portion J2 shown in FIG. 3, only the stirring pin F2 of the rotated rotating tool F is brought into contact with the abutting portion J2 on the tip side to perform spot welding. In this step, only the stirring pin F2 is shallowly pushed into the abutting portion J2 on the front end side at a predetermined interval. Then, only the stirring pin F2 is brought into contact with the first metal member 10 and the second metal member 20. As a result, a plasticized region W0 is formed at the imprint of the stirring pin F2.

The rotary tool F is preferably attached to an arm robot (not shown) equipped with a rotary drive means such as a spindle unit at its tip. Thereby, spot joining can be easily performed.
The temporary joining step of the abutting portion J1 shown in FIG. 4 is a step of performing temporary joining on the abutting portion J1 using the rotary tool F (rotary tool for temporary joining).

In this step, the first metal member 10 and the second metal member 20 are relatively turned upside down from the state of FIG. 3, and spot joining is performed on the abutting portion J1 by the rotary tool F. In this step, similarly to the temporary joining step of the abutting portion J2, the plasticizing region W0 is formed by shallowly pushing only the stirring pin F2 into the abutting portion J1 on the base end side at a predetermined interval.

After the temporary joining process, the auxiliary member disposing process is performed. The auxiliary member arranging step is a step of arranging the auxiliary member 30 on the first metal member 10 and the second metal member 20 so as to cover the abutting portion J1, as shown in FIGS.
The auxiliary member 30 is a plate-shaped member made of metal. The auxiliary member 30 is not particularly limited as long as it is a metal capable of friction stirring, but in the first embodiment, it is made of the same material as the first metal member 10 and the second metal member 20.

The plate thickness of the auxiliary member 30 is appropriately set such that the plasticized region W is not metal-deficient after the main joining process described later and the gap S of the abutting portion J1 on the base end side is filled with metal. In the first embodiment, the plate thickness of the auxiliary member 30 is set thinner than the plate thicknesses of the first metal member 10 and the second metal member 20.

The auxiliary member 30 is arranged on the horizontal plate 23 of the second metal member 20 so as to cover the abutting portion J1 formed by the side surface 10a of the first metal member 10 and the base end portion 22 of the second metal member 20. The back surface 30a of the auxiliary member 30 is brought into surface contact, and the end surface 30b of the auxiliary member 30 is butted against the side surface 10a of the first metal member 10.

In addition, the first metal member 10, the second metal member 20, and the auxiliary member 30 are immovably restrained by a jig (not shown). Although the auxiliary member 30 has a plate shape in the first embodiment, it may have another shape.

After the auxiliary member placement step, the main joining step is performed. As shown in FIGS. 7 and 8, the main joining step is a step of performing friction stir welding on the butt portion J1 on the base end side using a rotary tool F (rotary tool for main joining). Here, it is preferable that the main joining rotary tool is shared with the temporary joining rotary tool. That is, in this embodiment, the same rotary tool F is used as the main joining rotary tool and the temporary joining rotary tool.

A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In this embodiment, since the rotary tool F is rotated clockwise, the spiral groove is formed counterclockwise from the base end toward the tip. By setting the spiral groove in this way, the metal that has been plastically fluidized during frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove. This can reduce the amount of metal that overflows to the outside of the metal members to be joined (the first metal member 10, the second metal member 20, and the auxiliary member 30). The rotary tool F is attached to, for example, an arm robot provided with a rotary drive means such as a spindle unit at its tip. By attaching to the arm robot, the inclination angle of the rotation center axis of the rotation tool F can be easily changed.

In the friction stir welding of the butt portion J1, the stirring pin F2 rotated clockwise is inserted into the start position Sp set at the portion where the side surface 10a of the first metal member 10 and the end surface 30b of the auxiliary member 30 are in contact, The rotary tool F is relatively moved along J1. That is, with the base end side of the stirring pin F2 exposed, only the stirring pin F2 is brought into contact with the first metal member 10, the second metal member 20, and the auxiliary member 30 to perform friction stirring. Further, the traveling direction of the rotary tool F is set so that the auxiliary member 30 is located on the right side of the rotary tool F. In the case of FIG. 7, the rotary tool F is moved from the front side to the back side of the figure (indicated by a white arrow). As a result, a linear plasticized region W is formed on the movement trajectory of the rotary tool F.

As shown in FIG. 8, in the friction stir step, the rotary tool F is inclined with respect to the second metal member 20 so that the connecting portion F1 does not interfere with the side surface 10a of the first metal member 10, and the friction stir welding is performed. I do. The insertion angle and the insertion depth of the stirring pin F2 may be appropriately set so that the first metal member 10 and the second metal member 20 can be joined. In this embodiment, the central axis of rotation of the rotary tool F is inclined by 45° with respect to the vertical plane (side surface 10a).

In the main joining process, it is desirable to set the joining conditions so that burrs are generated on the auxiliary member 30. The position at which burrs occur depends on the joining conditions. The welding conditions are the rotation speed of the rotary tool F, the rotation direction, the moving speed (feed speed), the traveling direction, the inclination angle (taper angle) of the stirring pin F2, the metal member to be welded (the first metal member 10, the second metal member). It is determined by each element such as the material of the metal member 20 and the auxiliary member 30), the thickness of the metal member to be joined, and the combination of these elements.

For example, when the rotation speed of the rotary tool F is low, the shear side (advancing side: rotary tool On the side where the moving speed of the rotary tool is added to the tangential speed on the outer circumference), the temperature of the plastic flow material is more likely to rise, so that more burrs tend to occur on the shear side outside the plasticizing region. On the other hand, for example, when the rotation speed of the rotary tool F is high, the temperature of the plastic flow material increases on the shear side, but since the rotation speed is higher, more burrs tend to occur on the flow side outside the plasticizing region. is there.

In the present embodiment, since the rotation speed of the rotary tool F is set to be high, in the friction stir welding of the abutting portion J1, a large amount of burr V tends to occur on the auxiliary member 30 on the flow side outside the plasticizing region W. Yes (see FIG. 8). The joining condition of the rotary tool F and the arrangement position of the auxiliary member 30 are not limited to those described here and may be set appropriately.

In this way, if the joining conditions are set such that the side on which the burr V is generated or the side on which the burr V is frequently formed is the auxiliary member 30, the burr V can be collected on the auxiliary member 30 as shown in FIG. it can. Therefore, the removal step described later can be easily performed, which is preferable. Further, by setting the rotation speed of the rotary tool F to be high, the moving speed (feed speed) of the rotary tool F can be increased. As a result, the joining cycle can be shortened.

After the main joining step, a removing step is performed. In the present embodiment, the removing step is a step of removing the auxiliary member 30 from the second metal member 20. As shown in FIG. 9, in the removing step of the present embodiment, the end portion of the auxiliary member 30 is turned up in the direction of the arrow and is cut off so as to be bent at the plasticized region W as a boundary. A cutting tool or the like may be used in the removing step, but in the present embodiment, it is manually removed. Since the burr V is formed on the auxiliary member 30, the burr V is removed together with the auxiliary member 30.

According to the joining method of the present embodiment described above, the first metal member 10 and the second metal member 20 are joined, and in addition to the first metal member 10 and the second metal member 20, the auxiliary member 30 is also provided. By performing friction stir welding at the same time, it is possible to prevent metal shortage at the joint.
Further, since the burr V generated by the friction stir welding can be removed from the metal member together with the auxiliary member 30, the step of removing the burr V becomes easy. Further, in the main joining step, since the friction stir welding is performed with only the stirring pin F2 being in contact with the metal member to be welded, the load acting on the welding apparatus can be reduced.

In the temporary joining step, the load acting on the friction stirrer can be reduced by spot joining the abutting portions J1, J2 with only the stirring pin F2 in contact with the metal member. Further, the process time can be shortened as compared with the conventional case where the temporary joining is performed for the entire length of the abutting portions J1, J2.

Further, by using the same rotary tool F for the temporary joining rotary tool and the main joining rotary tool, it is not necessary to replace the rotary tool F in the temporary joining step and the main joining step, thereby improving work efficiency. Can

[Second embodiment]
Also in the second embodiment, the butting step, the temporary joining step, the auxiliary member disposing step, the main joining step, and the removing step are performed. However, the steps other than the auxiliary member arranging step, the main joining step, and the removing step are the same as those in the first embodiment, and detailed description thereof will be omitted. The same members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

First, as shown in FIGS. 10 and 11, in the auxiliary member disposing step, the butting portion J1 formed by the side surface 10a of the first metal member 10 and the base end portion 22 of the second metal member 20 is covered. The back surface 30a of the auxiliary member 30 is brought into surface contact with the side surface 10a of the first metal member 10, and the end surface 30b of the auxiliary member 30 is abutted against the base end portion 22 of the second metal member 20.

Next, the main joining step will be described. In the friction stir welding of the butt portion J1, the stirring pin F2 rotated clockwise is inserted into the start position Sp set at the portion where the side surface 10a of the first metal member 10 and the end surface 30b of the auxiliary member 30 are in contact, The rotary tool (rotary tool for main joining) F is relatively moved along J1. That is, with the base end side of the stirring pin F2 exposed, only the stirring pin F2 is brought into contact with the first metal member 10, the second metal member 20, and the auxiliary member 30 to perform friction stirring. Further, the traveling direction of the rotary tool F is set so that the auxiliary member 30 is located on the right side of the rotary tool F. In the case of FIG. 12, the rotary tool F is moved from the back side to the front side of the figure (indicated by a white arrow). As a result, a linear plasticized region W is formed on the movement trajectory of the rotary tool F. The burr V also occurs mainly in the auxiliary member 30.

The removing step is a step of removing the auxiliary member 30 from the first metal member 10. Although not shown, in the present embodiment as well as in the first embodiment, the end portion of the auxiliary member 30 is turned over, and the auxiliary member 30 is cut off so as to be bent at the plasticized region W as a boundary. Since the burr V is formed on the auxiliary member 30, the burr V is removed together with the auxiliary member 30.

According to the joining method of the present embodiment described above, the first metal member 10 and the second metal member 20 are joined, and in addition to the first metal member 10 and the second metal member 20, the auxiliary member 30 is also provided. By performing friction stir welding at the same time, it is possible to prevent metal shortage at the joint.
Further, also in the removing step of the present embodiment, the burr V generated by the friction stir welding can be removed together with the auxiliary member 30 from the first metal member 10, so that the step of removing the burr becomes easy.
In addition, according to the second embodiment, the same effect as that of the first embodiment can be obtained.

[Third embodiment]
Also in the third embodiment, the butting step, the temporary joining step, the auxiliary member disposing step, the main joining step, and the removing step are performed. In the third embodiment, steps other than the temporary joining step are the same as those in the first embodiment or the second embodiment, and detailed description thereof will be omitted. The same members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

The temporary joining step of the present embodiment is a step of temporarily joining the abutting portions J1 and J2 by welding, as shown in FIGS. At this time, the kind of welding is not particularly limited, but for example, arc welding such as MIG welding (Metal Inert Gas welding) or TIG welding (Tungsten Inert Gas welding) or laser welding can be performed.

Reference numeral Y1 is a nozzle of the welding machine. Reference numeral Y2 located between the nozzle Y1 and the abutting portions J1 and J2 is an arc generated between the nozzle Y1 and the abutting portions J1 and J2 if the welding is MIG welding or TIG welding. In the case of laser welding, the laser light is emitted from the nozzle Y1.

When performing temporary joining using such welding, as shown in FIGS. 13 and 14, the nozzle Y1 is moved along the abutting portions J1 and J2 to perform shallow welding at predetermined intervals (forming a shallow molten pool). ), spot joining is performed. As a result, spot joining regions W01, which are spot-like welding regions, are formed at the abutting portions J1, J2 at predetermined intervals. In MIG welding and TIG welding, welding can be performed while supplying the filler metal to form the weld metal at the butt portions J1 and J2.

According to the temporary joining process using such welding, the process time can be shortened as compared with the conventional case where the temporary joining is performed for the entire length of the abutting portions J1, J2.
In addition, according to the third embodiment, the same effects as those of the first embodiment or the second embodiment can be obtained.

Although the embodiments of the present invention have been described above, design changes can be made as appropriate within the scope of the present invention. For example, different rotary tools may be used in the temporary joining process and the main joining process. Further, the temporary joining step may be omitted, or may be performed only on at least one of the butting portions J1, J2.

10 First Metal Member 10a Side Surface 20 Second Metal Member 21 Vertical Plate 21a Side Surface 21b Side Surface 22 Base End 23 Horizontal Plate 30 Auxiliary Member 30a Backside 30b End Face F Rotating Tool, Rotating Tool for Main Joining, Rotating Tool for Temporary Joining F1 Stirring Pin J1 Butt J2 Butt

Claims (10)

A joining method for joining a first metal member and a second metal member by friction stir welding using a rotary tool for main joining equipped with a stirring pin,
The first metal member has a plate shape,
The second metal member is formed to have an L-shaped cross section in which a horizontal plate protrudes from a base end portion on one side surface side of the vertical plate.
A butting step of forming a butt portion by butting the side surface of the first metal member and the other side surface of the vertical plate of the second metal member,
After the abutting step, the back surface of the auxiliary member is attached to the horizontal plate of the second metal member so as to cover the abutting portion formed by the side surface of the first metal member and the base end portion of the second metal member. Auxiliary member placement step of making surface contact,
After the step of arranging the auxiliary member, the agitating pin is inserted from the surface side of the auxiliary member, and the abutting is performed with only the agitating pin being in contact with the auxiliary member, the first metal member and the second metal member. A main joining step of relatively moving the rotary tool for main joining along a portion to perform friction stir welding of the auxiliary member, the first metal member and the second metal member,
After the main joining step, a removing step of removing the auxiliary member on which the burr is formed from the second metal member is included. A joining method for joining a first metal member and a second metal member by friction stir welding using a rotary tool for main joining equipped with a stirring pin,
The first metal member has a plate shape,
The second metal member is formed to have an L-shaped cross section in which a horizontal plate protrudes from a base end portion on one side surface side of the vertical plate.
A butting step of forming a butt portion by butting the side surface of the first metal member and the other side surface of the vertical plate of the second metal member,
After the abutting step, the back surface of the auxiliary member is provided on the side surface of the first metal member so as to cover the abutting portion constituted by the side surface of the first metal member and the base end portion of the second metal member. Auxiliary member placement step of making surface contact,
After the step of arranging the auxiliary member, the agitating pin is inserted from the surface side of the auxiliary member, and the abutting is performed with only the agitating pin being in contact with the auxiliary member, the first metal member and the second metal member. A main joining step of relatively moving the rotary tool for main joining along a portion to perform friction stir welding of the auxiliary member, the first metal member and the second metal member,
After the main joining step, a removing step of removing the auxiliary member on which the burr is formed from the first metal member is included. Prior to the auxiliary member arranging step, friction stirring is performed by inserting only the stirring pin of the rotary tool for temporary joining into the butt portion formed by the side surface of the first metal member and the base end portion of the second metal member. The joining method according to claim 1, further comprising a temporary joining step of performing spot joining by joining. The joining method according to claim 3, wherein the temporary joining rotary tool and the main joining rotary tool are the same rotary tool. Before the auxiliary member arranging step, it includes a temporary joining step of spot joining by welding to the butt portion formed by the side surface of the first metal member and the base end portion of the second metal member. The joining method according to claim 1 or 2. The joining method according to claim 5, wherein the welding is MIG welding, TIG welding, or laser welding. Before the auxiliary member arranging step, friction is caused by inserting only the stirring pin of the rotary tool for temporary joining into the butt portion formed by the tip of the first metal member and the tip of the vertical plate of the second metal member. The joining method according to claim 1 or 2, further comprising a temporary joining step of performing spot joining by stirring joining. The joining method according to claim 7, wherein the rotary tool for temporary joining and the rotary tool for main joining are the same rotary tool. Prior to the auxiliary member disposing step, a temporary joining step of spot joining by welding to the abutting portion formed by the tip of the first metal member and the tip of the vertical plate of the second metal member is included. The joining method according to claim 1 or claim 2. The joining method according to claim 9, wherein the welding is MIG welding, TIG welding, or laser welding.

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