JP2018134669A - Joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method capable of preventing a metal shortage of a joint portion.SOLUTION: A joining method for joining metal members 10 and 20 includes: a step of forming the first metal member 10 and the second metal member 20 into square cylindrical shapes, and causing one outside surface 11a of the first metal member 10 to abut against the other outside surface 21a of the second metal member 20 to form an abutting part J1 on a base end side; a step of arranging an auxiliary member 30 on both of the metal members 10 and 20 so as to cover the abutting part J1 on the base end side; a step of moving a rotary tool F in a state in which only a stirring pin F2 is brought into contact with the auxiliary member 30 and both of the metal members 10 and 20, and performing friction stir joining of the auxiliary member 30 and both of the metal members 10 and 20; and a step of removing the auxiliary member 30 on which a burr is formed from both of the metal members 10 and 20.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a joining method for joining metal members together by friction stirring.

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

JP 2013-039613 A

  In the conventional joining method described above, since the plastic fluidized metal is not pressed by the shoulder portion of the rotary tool, there is a problem that the plastic fluidized metal leaks to the outside and the joint becomes insufficient.

  Then, this invention makes it a subject to provide the joining method which can prevent the metal shortage of a junction part.

  A first invention for solving the above-described problem is a joining method in which a first metal member and a second metal member are joined by friction stirring using a main welding rotary tool provided with a stirring pin. The one metal member and the second metal member have corners in which the first horizontal plate is connected to the base ends of the two vertical plates and the second horizontal plate is connected to the distal ends of the two vertical plates. A butting step, which is formed in a cylindrical shape, butts one outer surface of the first metal member and the other outer surface of the second metal member to form a butting portion; and the butting portion on the base end side An auxiliary member disposing step of disposing an auxiliary member on the first metal member and the second metal member so as to cover, and the stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is inserted into the auxiliary member The base end side in contact with the first metal member and the second metal member A main joining step of moving the main welding rotary tool along the abutting portion to perform friction stir welding of the auxiliary member, the first metal member, and the second metal member, and the auxiliary in which a burr is formed. Removing the member from the first metal member and the second metal member.

  A second invention for solving the above-described problem is a joining method in which the first metal member and the second metal member are joined by friction stirring using the main rotating tool having a stirring pin. The one metal member and the second metal member have corners in which the first horizontal plate is connected to the base ends of the two vertical plates and the second horizontal plate is connected to the distal ends of the two vertical plates. A butting step, which is formed in a cylindrical shape, butts one outer surface of the first metal member and the other outer surface of the second metal member to form a butting portion; and the butting portion on the base end side Auxiliary member arranging step of arranging an auxiliary member on the first metal member or the second metal member, and inserting the stirring pin from the surface side of the auxiliary member, and only the stirring pin is the auxiliary member, In front of the proximal end side in contact with the first metal member and the second metal member. A main joining step in which the rotating tool for main joining is moved along the butting portion to perform friction stir welding of the auxiliary member, the first metal member, and the second metal member, and the auxiliary member in which burrs are formed. Removing from the first metal member or the second metal member.

According to the joining method in the first invention and the second invention, the first metal member and the second metal member are joined, and in addition to the first metal member and the second metal member, the auxiliary member also frictions simultaneously. By stirring and joining, metal shortage at the joint can be prevented.
Moreover, since the burr | flash generate | occur | produced by friction stir welding can be removed from a metal member with an auxiliary member, the process of removing a burr | flash becomes easy.

Prior to the auxiliary member arranging step, it is preferable to include a temporary joining step in which only the stirring pin of the rotary tool for temporary joining is inserted into the abutting portion on the base end side and the friction stir welding is performed with a spot.
Prior to the auxiliary member arranging step, it is preferable to include a temporary joining step in which only the stirring pin of the rotary tool for temporary joining is inserted into the abutting portion on the distal end side and the friction stir welding is performed with a spot.

  According to this joining method, it is possible to reduce the load acting on the friction stirrer by performing spot spotting of the butt portion in a state where only the stirring pin is in contact with the metal member. Moreover, the process time can be shortened compared with the case where temporary joining is performed on the entire length of the butt portion as in the prior art.

  Moreover, it is preferable that the said temporary rotating tool for temporary joining and the said rotational tool for main joining are the same rotating tools. According to such a joining method, since it is not necessary to replace the rotating tool, the working efficiency can be improved.

It is preferable to include the temporary joining process of joining the said butt | matching part of a base end side with the spot by welding before the said auxiliary member arrangement | positioning process. Moreover, MIG welding, TIG welding, or laser welding can be used for the said welding.
Before the auxiliary member arranging step, it is preferable to include a temporary joining step of joining the butt portion on the tip side with a spot by welding. Moreover, MIG welding, TIG welding, or laser welding can be used for the said welding.

  According to this joining method, process time can be shortened compared with the case where temporary joining is performed with respect to the full length of the butt | matching part conventionally.

  According to the joining method according to the present invention, metal shortage at the joint can be prevented.

It is a perspective view which shows before the butt | matching process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the after-butting process of the joining method which concerns on 1st embodiment. It is a perspective view which shows temporary joining of the butt | matching part of the front end side in the temporary joining process of the joining method which concerns on 1st embodiment. It is a perspective view which shows temporary joining of the butt | matching part of a base end side in the temporary joining process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member arrangement | positioning process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the main joining process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows before the removal process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the modification of the temporary joining of the butt | matching part of the front end side in the temporary joining process of the joining method which concerns on 1st embodiment. It is a perspective view which shows the modification of temporary joining of the butt | matching part of a base end side in the temporary joining process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the joining method which concerns on 3rd embodiment. It is sectional drawing which shows the main joining process of the joining method which concerns on 3rd embodiment. It is sectional drawing which shows the removal process of the joining method which concerns on 3rd embodiment.

[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, two rectangular metal plates (first metal member and second metal member) are joined. In the joining method according to the first embodiment, a butt process, a first provisional joining process, a second provisional joining process, an auxiliary member arranging process, a main joining process, and a removing process are performed. In the following description, “front surface” means a surface opposite to the “back surface”.

As shown in FIG. 1, the butting process is a process in which the square metal first metal member 10 and the second metal member 20 are butted together.
The 1st metal member 10 and the 2nd metal member 20 consist of plate-shaped members made from an aluminum alloy. The material of the 1st metal member 10 and the 2nd metal member 20 is suitably selected from the metals which can be friction-stirred, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy, for example.
The first metal member 10 and the second metal member 20 of the first embodiment are obtained by arranging two rectangular tube-shaped members side by side.

The first metal member 10 is a shape member having an axial cross section formed into a quadrangular ring shape. The first metal member 10 is connected to the two vertical plates 11, 11, the first horizontal plate 12 connected to the base ends of the vertical plates 11, 11, and the distal ends of the vertical plates 11, 11. And the second horizontal plate 13.
That is, the first metal member 10 has a first horizontal plate 12 and a second horizontal plate 13 connected at right angles to the distal end portion and the base end portion of the inner surface of one vertical plate 11, and The 1st horizontal plate 12 and the 2nd horizontal plate 13 are connected to the front-end | tip part and base end part of an inner surface at right angle.
As shown in FIG. 2, a corner portion 15 bent at a right angle is formed at a connection portion between the vertical plate 11 and the first horizontal plate 12 and the second horizontal plate 13. A curved surface curved in an arc shape is formed on the top of the outer side of the corner portion 15.
In addition, in the 1st metal member 10 of 1st embodiment, although the height of the two vertical plates 11 and 11 and the horizontal width of the 1st horizontal plate 12 and the 2nd horizontal plate 13 are formed in the same length. Different lengths may be formed.

As shown in FIG. 1, the second metal member 20 is a shape member having an axial cross section formed into a quadrangular ring shape, and is a rectangular tube-shaped member having the same shape as the first metal member 10. The second metal member 20 is connected to the two vertical plates 21, 21, the first horizontal plate 22 connected to the base ends of the vertical plates 21, 21, and the distal ends of the vertical plates 21, 21. And a second horizontal plate 23.
In addition, the 2nd metal member 20 forms the height of the two vertical boards 21 and 21 and the horizontal width of the 1st horizontal board 22 and the 2nd horizontal board 23 in a different length like the 1st metal member 10. May be.

In the butting process, as shown in FIG. 2, the outer surface 11 a of one vertical plate 11 of the first metal member 10 (the left side surface of the left vertical plate 11 in FIG. 2) and the other vertical surface of the second metal member 20. The outer surface 21a of the plate 21 (the right side surface of the right vertical plate 21 in FIG. 2) is brought into surface contact with each other.
At this time, the back surface 12a of the first horizontal plate 12 of the first metal member 10 (the lower surface of the first horizontal plate 12 in FIG. 2) and the back surface 22a of the first horizontal plate 22 of the second metal member 20 (the first in FIG. 2). The lower surface of one horizontal plate 22 is flush with the other.
Further, the surface 13a of the second horizontal plate 13 of the first metal member 10 (the upper surface of the second horizontal plate 13 in FIG. 2) and the surface 23a of the second horizontal plate 23 of the second metal member 20 (second in FIG. 2). The upper surface of the horizontal plate 23 is flush with the upper surface.

When one outer surface 11a of the first metal member 10 and the other outer surface 21a of the second metal member 20 are abutted by the butting process, the corner 15 on the proximal end side of the first metal member 10; The base end side butting portion J1 is formed by the base end side corner portion 25 of the second metal member 20.
Further, the leading end side butting portion J2 is formed by the leading end side corner portion 15 of the first metal member 10 and the leading end side corner portion 25 of the second metal member 20.
Since the corner 15 of the first metal member 10 and the corner 25 of the second metal member 20 are curved in opposite directions, the corner 15 of the first metal member 10 and the corner 25 of the second metal member 20 are curved. Between the two, a substantially V-shaped gap S is formed.

As shown in FIG. 3, the first temporary joining step is a step of performing temporary joining to the abutting portion J <b> 2 on the distal end side using the rotary tool F (temporary joining rotary tool).
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 part F1 is a part connected to the rotating shaft of the friction stirrer. The connecting part 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 formed on the outer peripheral surface of the stirring pin F2. In the first embodiment, in order to rotate the rotary tool F to the right, the spiral groove is formed counterclockwise as it goes from the proximal end to the distal end.
In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise as it goes from the proximal end to the distal end.

  By setting the spiral groove in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the quantity of the metal which overflows outside the to-be-joined metal member (the 1st metal member 10, the 2nd metal member 20, and the auxiliary member 30) can be decreased. The spiral groove may be omitted.

In the first temporary joining step, spot tacking is performed by bringing only the stirring pin F2 of the rotated rotary tool F into contact with the abutting portion J2 on the distal end side. In the first temporary joining step, only the stirring pin F2 is shallowly pushed into the abutting portion J2 on the tip side with a predetermined interval. A plasticized region W0 is formed in the trace of pushing of the stirring pin F2.
The rotary tool F is preferably attached to an arm robot (not shown) provided with a rotation drive means such as a spindle unit at the tip. Thereby, spot tacking can be performed easily.

As shown in FIG. 4, the second temporary joining step is a step of temporarily joining the base end side butt portion J <b> 1 using the rotating tool F (temporary joining rotating tool).
In the second temporary bonding step, the first metal member 10 and the second metal member 20 are turned upside down and turned upside down, and spot tacking is performed on the abutting portion J1 on the base end side by the rotated rotary tool F. In the second temporary joining step, as in the first temporary joining step, the plasticized region W0 is formed by pressing only the stirring pin F2 shallowly into the abutting portion J1 on the base end side with a predetermined interval. .

As shown in FIG. 5, 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 butt end J1 on the base end side.
The auxiliary member 30 is a metal plate member. The auxiliary member 30 is not particularly limited as long as it is a metal capable of friction stirring, but in the first embodiment, the auxiliary member 30 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 so that the plasticized region W does not run out of metal after the main joining step described later, and the gap S of the butt 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 to be thinner than the plate thicknesses of the first metal member 10 and the second metal member 20.

In the auxiliary member arranging step, as shown in FIG. 6, the back surface 30 b of the auxiliary member 30, the back surface 12 a of the first horizontal plate 12 of the first metal member 10, and the back surface 22 a of the first horizontal plate 22 of the second metal member 20. And surface contact. Thereby, the butt portion J1 on the proximal end side is covered by the auxiliary member 30.
Moreover, the 1st metal member 10, the 2nd metal member 20, and the auxiliary member 30 are restrained to a mount (not shown) so that a movement is impossible with a jig | tool (not shown). In addition, in 1st embodiment, although the auxiliary member 30 is made into plate shape, another shape may be sufficient.

As shown in FIG. 7, the main joining step is a step of performing friction stir welding with respect to the butt end portion J <b> 1 on the base end side using the rotary tool F (main welding rotary tool). In the main joining step, as shown in FIG. 8, the rotating tool F rotated to the right is inserted from the surface 30a of the auxiliary member 30, and the insertion depth of the stirring pin F2 is set so as to reach the abutting portion J1 on the base end side. Set.
In the main joining step, friction stir welding is performed in a state where only the stirring pin F2 is brought into contact with the auxiliary member 30, the first metal member 10 and the second metal member 20, and the proximal end side of the stirring pin F2 is exposed.

Then, as shown in FIG. 7, the rotary tool F is moved along the base end-side butting portion J1. Thereby, the auxiliary member 30, the first metal member 10, and the second metal member 20 are friction stir welded at the abutting portion J1 on the base end side. A plasticized region W is formed on the movement locus of the rotary tool F.
After the main joining step, as shown in FIG. 9, the auxiliary member 30 is divided into the first metal member 10 side and the second metal member 20 side by the plasticized region W. Further, burrs V and V are formed at the ends of the divided auxiliary members 30 and 30.

  The removal step is a step of removing the auxiliary member 30 from the first metal member 10 and the second metal member 20, as shown in FIG. In the removal step, the auxiliary member 30 is bent in a direction away from the first metal member 10 and the second metal member 20 by, for example, manual work, and the auxiliary member 30 is removed from the first metal member 10 and the second metal member 20. . Thereby, the 1st horizontal plate 12 of the 1st metal member 10 and the 1st horizontal plate 22 of the 2nd metal member 20 are joined planarly.

According to the joining method which concerns on 1st embodiment demonstrated above, as shown in FIG. 8, while the 1st metal member 10 and the 2nd metal member 20 are joined, the 1st metal member 10 and the 2nd metal member In addition to 20, the auxiliary member 30 can also be friction stir welded at the same time to prevent metal shortage at the joint (plasticized region W).
Further, by performing friction stir welding with only the stirring pin F2 of the rotary tool F in contact with the auxiliary member 30, the first metal member 10 and the second metal member 20, the load acting on the friction stirrer is reduced. be able to.
In the joining method according to the first embodiment, as shown in FIGS. 3, 4, and 7, in the main joining step and the temporary joining step, only the stirring pin F <b> 2 of the rotary tool F is brought into contact with the metal member to cause friction. Since stirring is performed, the amount of heat input can be reduced, and the thermal strain of the first metal member 10 and the second metal member 20 can be reduced.

  Moreover, in the joining method which concerns on 1st embodiment, as shown in FIG. 8, the auxiliary member 30 is arrange | positioned in the butt | matching part J1 of a base end side, and the auxiliary member 30, the 1st metal member 10, and the 2nd metal member 20 are attached. Since the friction stir welding is performed at the same time, the gap S (see FIG. 6) between the corner portions 15 and 25 of the first metal member 10 and the second metal member 20 can be filled with the plastic fluidized metal.

Further, in the joining method according to the first embodiment, as shown in FIG. 9, burrs V and V are formed in the auxiliary member 30 by the main joining process, but as shown in FIG. 10, the burrs V are removed in the removing process. Can be removed together with the auxiliary member 30. Thereby, the process of removing the burr | flash V can be performed easily.
The auxiliary member 30 may be removed by using a removing device or the like, but in the first embodiment, the auxiliary member 30 can be easily removed manually.

Further, in the joining method according to the first embodiment, since the temporary joining process is performed, it is possible to prevent the opening of the butt end portion J1 on the base end side and the butt end portion J2 on the distal end side when performing the main joining step. In the first embodiment, it is possible to prevent the opening more reliably by temporarily joining the butting portion J2 on the distal end side.
Moreover, in the joining method according to the first embodiment, as shown in FIGS. 3 and 4, the base end side butting portion J1 and the base end side in a state where only the stirring pin F2 of the rotary tool F is in contact with the metal member. By carrying out spot tacking of the butting portion J2, the load acting on the friction stirrer can be reduced. Moreover, the process time can be shortened compared with the case where temporary joining is performed on the entire length of the butt portion as in the prior art.

  Moreover, in 1st embodiment, the rotation tool F (rotary tool for temporary joining) which performs a 1st temporary joining process and a 2nd temporary joining process, and the rotational tool F (main joining rotational tool) which performs a main joining process are the same. The rotation tool is used. Thereby, since it is not necessary to replace | exchange a rotating tool at each process, work efficiency can be improved.

While the first embodiment of the present invention has been described above, design changes can be made as appropriate without departing from the spirit of the present invention.
For example, you may use the rotary tool provided with the shoulder part and the stirring pin for the rotary tool for temporary joining or the rotary tool for main joining. Further, different rotary tools may be used in the temporary joining step and the main joining step.

  In the first embodiment, as shown in FIG. 2, the corner portion 15 of the first metal member 10 and the corner portion 25 of the second metal member 20 are rounded, and the base end side butting portion J1 and the distal end are formed. Although the gap S is provided in the butt portion J2 on the side, the gap S may be configured so as not to exist.

  Further, in the first temporary joining step of the first embodiment, as shown in FIG. 3, the rotary tool F is used to temporarily join the abutting portion J2 on the distal end side, but as shown in FIG. The temporary joining may be performed by welding on the butted portion J2 on the distal end side. At this time, the type of welding is not particularly limited, but for example, arc welding such as MIG welding or TIG welding or laser welding can be used. Then, spot welding is performed at a predetermined interval while bringing the welding torch H close to the abutting portion J2 on the front end side. In this way, a welding mark W2 is formed in the spot spot-attached portion.

  Similarly to the first temporary joining step, as shown in FIG. 12, in the second temporary joining step, temporary joining may be performed on the base end side butt portion J1 by welding. Also in this case, the type of welding is not particularly limited. Then, spot welding is performed with a predetermined interval while the welding torch H is brought close to the butt portion J1 on the base end side.

  Thus, in the temporary joining step, as shown in FIG. 11 and FIG. 12, in the case where spot tacking is performed on the butt end portion J1 and the butt end portion J2 on the proximal end side by welding, the tacking is performed by friction stirring. The load acting on the friction stirrer can be reduced as compared with the case where the friction stirrer is performed. In addition, the process time can be shortened as compared with the conventional case where temporary joining is performed on the entire length of the base end side butting portion J1 and the distal end side butting portion J2.

  In the first embodiment, as shown in FIG. 7, the auxiliary member 30 is disposed only at the base end-side butting portion J1 and friction stir welding is performed, but the tip-side butting portion J2 is similarly connected to the auxiliary member 30. It may be arranged and friction stir welded.

[Second Embodiment]
Next, the auxiliary member arranging step, the main joining step, and the removing step of the joining method according to the second embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 13, the joining method according to the second embodiment is different from the first embodiment in the ratio of arranging the auxiliary member 30 in the first metal member 10 and the second metal member 20 in the auxiliary member arranging step. . The joining method according to the second embodiment will be described with a focus on differences from the joining method of the first embodiment.

  In the auxiliary member arranging step of the second embodiment, as shown in FIG. 13, about 90% of the auxiliary member 30 is arranged on the second metal member 20, and the remaining 10% of the auxiliary member 30 is about the first metal member 10. To place. That is, the auxiliary member 30 is disposed so as to slightly protrude from the rear surface 12a of the first horizontal plate 12 of the first metal member 10 with respect to the butt end portion J1 on the base end side.

In the main joining step of the second embodiment, as shown in FIG. 14, the spiral groove is formed counterclockwise from the proximal end toward the distal end in order to rotate the rotary tool F (main joining rotary tool) to the right. Yes. In the main joining process, the rotary tool F is relatively moved from the near side to the far side in FIG.
In the main joining step of the second embodiment, friction stir welding is performed in a state where only the stirring pin F2 of the rotating tool F rotated to the right is in contact with the auxiliary member 30, the first metal member 10, and the second metal member 20. Thereby, in the butt | matching part J1 of a base end side, the auxiliary member 30, the 1st metal member 10, and the 2nd metal member 20 are friction-stir-welded, and the plasticization area | region W is formed.

  In the second embodiment, since the rotary tool F is rotated to the right, the second metal member 20 side is moved on the flow side of the joining rotary tool F (retreating side: the moving speed of the rotary tool from the tangential speed on the outer periphery of the rotary tool). Is the subtracted side). On the other hand, the first metal member 10 side is a shear side (advancing side: the side on which the moving speed of the rotating tool is added to the tangential speed on the outer periphery of the rotating tool).

When the rotational speed of the rotating tool F for joining is slow, the temperature of the shear fluid side is more likely to rise on the shear side than on the flow side, so that the shear side (first metal member 10 outside the plasticization region W1). Burrs V tend to occur on the side).
On the other hand, when the rotational speed of the rotating tool for welding F is high, the temperature of the plastic fluidized material increases on the shear side compared to that on the flow side, but the flow side outside the plasticizing region W1 (the rotational speed is faster). Many burrs V tend to occur on the second metal member 20 side).

  In the second embodiment, the movement direction and the rotation direction of the bonding rotary tool F are set so that the flow side of the bonding rotary tool F is on the second metal member 20 side (right side of the bonding center). The rotation direction and the traveling direction of the joining rotary tool F are not limited to those described above, and may be set as appropriate.

In the second embodiment, since the rotation speed of the joining rotary tool F is set high, there is a tendency that many burrs V are generated on the flow side outside the plasticizing region W1. That is, the burrs V can be concentrated on the auxiliary member 30 side. Moreover, the moving speed (feeding speed) of the joining rotary tool F can be increased by setting the rotational speed of the joining rotary tool F faster. Thereby, a joining cycle can be shortened.
In the second embodiment, in the main joining step, the contact ratio between the first metal member 10 and the auxiliary member 30 is adjusted so that the auxiliary member 30 does not remain on the first metal member 10 side.

In the removing process of the second embodiment, as shown in FIG. 15, by removing the auxiliary member 30 from the second metal member 20, the burr V can be removed together with the auxiliary member 30 remaining only on one side. The step of removing the burr V can be easily performed.
Further, by setting the rotation speed of the rotary tool F faster, the moving speed (feed speed) of the rotary tool F can be increased. Thereby, a joining cycle can be shortened.

As described above, which side of the traveling direction of the rotary tool F generates the burr V during the main joining process depends on the joining conditions.
The joining conditions include the rotational speed of the rotary tool F, the rotational direction, the moving direction, the moving speed (feeding speed), the inclination angle of the stirring pin F2, the materials of the first metal member 10, the second metal member 20, and the auxiliary member 30, It is determined by each element such as the thickness of each member and a combination of these elements.
If the auxiliary member 30 is arranged on the side where the burrs V are generated or the side where many burrs V are generated according to the joining conditions, the step of removing the burrs V can be easily performed.

The second embodiment of the present invention has been described above. However, similar to the first embodiment, the design can be changed as appropriate without departing from the spirit of the present invention.
For example, in the auxiliary member arrangement step, about 90% of the auxiliary member 30 may be arranged on the first metal member 10 and the remaining 10% of the auxiliary member 30 may be arranged on the second metal member 20. In this case, in the main joining process, various joining conditions are set so that burrs V are generated in the auxiliary member 30, and in the removing process, the auxiliary member 30 is removed from the first metal member 10. V can be removed together with the auxiliary member 30. Moreover, you may abbreviate | omit both a 1st temporary joining process and a 2nd temporary joining process.

[Third embodiment]
Next, the auxiliary member arranging step, the main joining step, and the removing step of the joining method according to the third embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 16, the joining method according to the third embodiment differs from the first embodiment in that the auxiliary member 30 is in surface contact with only the first metal member 10 in the auxiliary member process. The joining method according to the third embodiment will be described with a focus on differences from the joining method of the first embodiment.

  In the joining method according to the third embodiment, as shown in FIG. 17, in the main joining step, the rotating tool F is rotated counterclockwise, so that the spiral groove of the stirring pin F2 is formed clockwise as it goes from the proximal end to the distal end. Has been. In the main joining step, the rotary tool F is relatively moved from the near side to the far side in FIG.

In the third embodiment, since the rotary tool F is rotated counterclockwise, the first metal member 10 side is a flow side of the joining rotary tool F. On the other hand, the second metal member 20 side is a shear side of the joining rotary tool F.
In the main joining process of the third embodiment, since the rotational speed of the rotary tool F is set to be high, a large number of burrs V tend to be generated on the flow side outside the plasticizing region W1.

  And in the removal process of 3rd embodiment, the burr | flash V can be removed with the auxiliary member 30 by removing the auxiliary member 30 from the 1st metal member 10, as shown in FIG. That is, according to the third embodiment, it is only necessary to remove the auxiliary member 30 and the burr V remaining on only one side.

The third embodiment of the present invention has been described above. However, similar to the first embodiment, the design can be changed as appropriate without departing from the spirit of the present invention.
For example, in the auxiliary member arranging step, the auxiliary member 30 may be arranged so as to be in surface contact with only the second metal member 20. In this case, various joining conditions are set so that the burrs V are generated in the auxiliary member 30 in the main joining process, and the auxiliary member 30 is removed from the second metal member 20 in the removing process. V can be removed together with the auxiliary member 30. Moreover, you may abbreviate | omit both a 1st temporary joining process and a 2nd temporary joining process.

DESCRIPTION OF SYMBOLS 10 1st metal member 11 Vertical plate 12 1st horizontal plate 13 2nd horizontal plate 20 2nd metal member 21 Vertical plate 22 1st horizontal plate 23 2nd horizontal plate 30 Auxiliary member F Rotary tool F1 Connection part F2 Stirring pin J1 base End side butt part J2 Tip side butt part S Clearance V Burr W Plasticization region

Claims (10)

A joining method in which the first metal member and the second metal member are joined by friction stirring using a main welding rotary tool provided with a stirring pin,
In the first metal member and the second metal member, a first horizontal plate is connected to a base end portion of two vertical plates, and a second horizontal plate is connected to a distal end portion of the two vertical plates. It is formed in a square tube shape,
A butting step of butting one outer surface of the first metal member and the other outer surface of the second metal member to form a butting portion;
An auxiliary member arranging step of arranging an auxiliary member on the first metal member and the second metal member so as to cover the butt portion on the base end side;
The stirrer pin is inserted from the surface side of the auxiliary member, and only the stirrer pin is in contact with the auxiliary member, the first metal member, and the second metal member, along the butted portion on the base end side. A main joining step of moving the main joining rotary tool and performing friction stir welding of the auxiliary member, the first metal member and the second metal member;
A removing step of removing the auxiliary member formed with burrs from the first metal member and the second metal member. A joining method in which the first metal member and the second metal member are joined by friction stirring using a main welding rotary tool provided with a stirring pin,
In the first metal member and the second metal member, a first horizontal plate is connected to a base end portion of two vertical plates, and a second horizontal plate is connected to a distal end portion of the two vertical plates. It is formed in a square tube shape,
A butting step of butting one outer surface of the first metal member and the other outer surface of the second metal member to form a butting portion;
Auxiliary member arrangement step of arranging an auxiliary member on the first metal member or the second metal member along the butt portion on the base end side,
The stirrer pin is inserted from the surface side of the auxiliary member, and only the stirrer pin is in contact with the auxiliary member, the first metal member, and the second metal member, along the butted portion on the base end side. A main joining step of moving the main joining rotary tool and performing friction stir welding of the auxiliary member, the first metal member and the second metal member;
Removing the auxiliary member formed with burrs from the first metal member or the second metal member.   2. The preliminary joining step of performing friction stir welding at a spot by inserting only a stirring pin of a rotary tool for temporary joining into the abutting portion on the base end side before the auxiliary member arranging step. Alternatively, the joining method according to claim 2.   4. The joining method according to claim 3, wherein the temporary joining rotary tool and the main joining rotational tool are the same rotational tool.   The joining method according to claim 1, further comprising a temporary joining step of joining the butt portion on the base end side with a spot by welding before the auxiliary member arranging step.   The joining method according to claim 5, wherein the welding is MIG welding, TIG welding, or laser welding.   2. The temporary joining step of performing friction stir welding at a spot by inserting only a stirring pin of a rotary tool for temporary joining into the abutting portion on the front end side before the auxiliary member arranging step. Alternatively, the joining method according to claim 2.   The joining method according to claim 7, wherein the temporary joining rotary tool and the main joining rotational tool are the same rotational tool.   The joining method according to claim 1 or 2, further comprising a temporary joining step of joining the butted portion on the distal end side with a spot by welding before the auxiliary member arranging step.   The joining method according to claim 9, wherein the welding is MIG welding, TIG welding, or laser welding.

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