WO2020218444A1

WO2020218444A1 - Friction-stir point joining device and operation method for same

Info

Publication number: WO2020218444A1
Application number: PCT/JP2020/017550
Authority: WO
Inventors: 良司大橋; 良崇村松; 正樹武岡; 将弘三宅
Original assignee: 川崎重工業株式会社
Priority date: 2019-04-24
Filing date: 2020-04-23
Publication date: 2020-10-29
Also published as: JPWO2020218444A1

Abstract

A friction-stir point joining device according to the present invention comprises: a pin member (11); a shoulder member (12); a rotary driver (57); an advancement and retreatment driver (53); and a controller (51) configured to cause the advancement and retreatment driver (53) and the rotary driver (57) to be operated such that the tip of the shoulder member in a rotated state reach a predetermined first position preset in a first member (61), and the pin member (11) in a rotated state retreats from a joint target part of a joint target object (60).

Description

Friction stir welding device and its operation method

The present invention relates to a friction stir welding device and an operating method thereof.

The first member made of soft metal and the second member made of hard metal are superposed, and the probe is rotated from the side of the first member so that the tip thereof reaches directly above the second member. A method for joining dissimilar metal members is known, in which the first and second members are joined by inserting and rubbing and stirring (see, for example, Patent Document 1).

In the method of joining dissimilar metal members disclosed in Patent Document 1, a double-acting rotary tool in which the probe is configured separately from the shoulder member and is movable in the axial direction is used as the rotary tool. , The probe is inserted into the first member to perform friction stir welding of the first and second members.

Patent No. 4937386

However, even with the method for joining dissimilar metal members disclosed in Patent Document 1, there is still room for improvement from the viewpoint of shortening the joining time.

An object of the present invention is to provide a friction stir welding point joining device and an operating method thereof, which can shorten the joining time as compared with the joining method of dissimilar metal members disclosed in Patent Document 1. ..

In order to solve the above problems, the friction stirring point joining device according to the present invention is a friction stirring point joining device having a first member and a second member and joining by softening the object to be joined by frictional heat. The friction stirring point joining device comprises a pin member formed in a columnar shape, a shoulder member formed in a cylindrical shape through which the pin member is inserted therein, and the pin member and the shoulder member. A rotary drive that rotates around an axis that coincides with the axis of the pin member, an advance / retreat drive that moves the pin member and the shoulder member forward and backward along the axis, and a controller are provided. The first member is arranged so as to face the tool and is made of a material having a lower melting point than the second member. In the controller, the pin member and the shoulder member are rotated. Then, when the rotation drive and the advance / retreat drive are operated so as to press the jointed portion of the object to be joined (A), the tip of the shoulder member in the rotated state is preliminarily placed in the first member. The advance / retreat drive and the rotation drive are operated so as to reach a predetermined first position set and retract the pin member in a rotated state from the jointed portion of the object to be joined ( After B) and (B), the pin member in a rotated state is pulled out from the bonded portion of the object to be joined, and the pin member in a rotated state is pulled out from the bonded portion of the object to be joined. (C), in which the rotary drive and the advance / retreat drive are operated so as to advance toward the direction of (C), is configured to be executed.

As a result, when the pin member and the shoulder member have the same rotation speed, the peripheral speed is higher when the shoulder member is press-fitted into the bonded portion than when the pin member is press-fitted into the bonded portion. Become.

Therefore, when the shoulder member is press-fitted, the force for causing the plastic flow in the bonded portion is larger than when the pin member is press-fitted, and the decrease in the press-fitting speed into the bonded portion is suppressed. be able to. Therefore, the joining time can be shortened as compared with the joining method of dissimilar metal members disclosed in Patent Document 1.

Further, the operation method of the friction stirring point joining device according to the present invention is an operation method of a friction stirring point joining device having a first member and a second member and joining by softening the object to be joined by frictional heat. The friction stirring point joining device comprises a pin member formed in a columnar shape, a shoulder member formed in a cylindrical shape through which the pin member is inserted therein, and the pin member and the shoulder member. A rotary drive that rotates around an axis that coincides with the axis of the pin member, an advance / retreat drive that moves the pin member and the shoulder member forward and backward along the axis, and a controller are provided. The first member is arranged so as to face the tool and is made of a material having a lower melting point than the second member. In the controller, the pin member and the shoulder member are rotated. Then, when the rotation drive and the advance / retreat drive are operated so as to press the jointed portion of the object to be joined (A), the tip of the shoulder member in the rotated state is preliminarily placed in the first member. The advance / retreat drive and the rotation drive are operated so as to reach a predetermined first position set and retract the pin member in a rotated state from the jointed portion of the object to be joined ( After B) and (B), the pin member in a rotated state is pulled out from the bonded portion of the object to be joined, and the pin member in a rotated state is pulled out from the bonded portion of the object to be joined. (C), in which the rotary drive and the advance / retreat drive are operated so as to advance toward the direction of (C), is configured to be executed.

The above-mentioned object, other object, feature, and advantage of the present invention will be clarified from the detailed description of the following preferred embodiments with reference to the accompanying drawings.

According to the friction stir welding point joining device and its operating method according to the present invention, the joining time can be shortened as compared with the conventional joining method of dissimilar metal members.

FIG. 1 is a schematic view showing a schematic configuration of a friction stir welding device according to the first embodiment. FIG. 2 is a block diagram schematically showing a control configuration of the friction stir welding device shown in FIG. FIG. 3 is a flowchart showing an example of the operation of the friction stir welding device according to the first embodiment. FIG. 4A is a process diagram schematically showing an example of each process of friction stir point joining by the friction stir point joining device shown in FIG. FIG. 4B is a process diagram schematically showing an example of each process of friction stir point joining by the friction stir point joining device shown in FIG. FIG. 5 is a graph showing the results of a tensile shear test and a cross tensile test of a material to be welded by friction stir welding under the joining condition 1 using the friction stir point joining devices of Comparative Example 1 and Test Example 1. FIG. 6 is a cross-sectional photograph of an object to be welded under friction stir welding condition 1 or bonding condition 2 using the friction stir welding point bonding devices of Comparative Example 1 and Test Example 1. FIG. 7 is a graph showing the results of a cross tensile test of a material to be welded by friction stir point welding under the joining condition 1 using the friction stir point joining device of Test Example 2. FIG. 8 is a graph showing the results of a tensile shear test of an object to be welded by friction stir point joining under the joining conditions 3 to 6 using the friction stir point joining device of Test Example 3. FIG. 9 is a cross-sectional photograph of an object to be welded by friction stir point joining under the joining conditions 3 to 7 using the friction stir point joining device of Test Example 3. FIG. 10 is a cross-sectional photograph of an object to be welded by friction stir point bonding under the bonding condition 8 using the friction stir point bonding device of Test Example 4. FIG. 11 is a cross-sectional photograph of an object to be welded under friction stir welding condition 9 using the friction stir point joining devices of Comparative Example 2 and Test Example 5.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following, the same or corresponding elements will be designated by the same reference numerals throughout all the figures, and duplicate description thereof will be omitted. Further, in all the drawings, the constituent elements necessary for explaining the present invention are excerpted and shown, and the other constituent elements may be omitted. Furthermore, the present invention is not limited to the following embodiments.

(Embodiment 1)
The friction stirring point joining device according to the first embodiment is a friction stirring point joining device having a first member and a second member and joining by softening the object to be joined by frictional heat, and is a friction stirring point joining device. The device includes a pin member formed in a columnar shape, a shoulder member formed in a cylindrical shape, and a pin member inserted therein, and a pin member and a shoulder member around an axis that coincides with the axis of the pin member. The first member is arranged so as to face the tool, and includes a rotary drive that rotates the pin member and a shoulder member, and a controller that moves the pin member and the shoulder member forward and backward along the axis, respectively. In addition, the controller is made of a material having a lower melting point than the second member, and the controller is such that the pin member and the shoulder member press the jointed portion of the jointed object in a rotated state. When the advancing / retreating drive is operated (A), the tip of the shoulder member in the rotated state reaches a predetermined first position set in advance in the first member, and the pin member in the rotated state is joined. The advance / retreat drive and the rotary drive are operated so as to retreat from the jointed portion of the object, and after (B), the rotated shoulder member is pulled out from the joined portion of the object to be joined. (C), in which the rotary drive and the advance / retreat drive are operated so that the rotated pin member advances toward the joined portion of the object to be joined, is configured to be executed.

Further, in the friction stir welding apparatus according to the first embodiment, the first position is an arbitrary position of 25% or less of the thickness dimension of the first member from the contact surface of the first member with the second member. You may.

Further, in the friction stir welding apparatus according to the first embodiment, when the radius of the tip surface of the shoulder member is Rs and the radius of the tip surface of the pin member is Rp, the following equation Rs> 2 ^It may be configured to satisfy ^1/2 × Rp.

Further, in the friction stir welding device according to the first embodiment, the sealant material may be applied to the contact portion between the first member and the second member which are overlapped with each other.

Hereinafter, an example of the friction stir welding device according to the first embodiment will be described in detail with reference to the drawings.

[Structure of friction stir welding device]
FIG. 1 is a schematic view showing a schematic configuration of a friction stir welding device according to the first embodiment. In addition, in FIG. 1, the vertical direction in the figure is represented as the vertical direction in the friction stir welding apparatus.

As shown in FIG. 1, the friction stir welding device 50 according to the first embodiment includes a pin member 11, a shoulder member 12, a tool fixing device 52, an advancing / retreating drive 53, a clamp member 13, and a backing support portion 55. It includes a backing member 56 and a rotary drive 57.

The pin member 11, the shoulder member 12, the tool fixing device 52, the advancing / retreating drive 53, the clamp member 13, and the rotary drive 57 are provided at the upper end of the backing support portion 55 composed of the C-type gun (C-type frame). Has been done. Further, a backing member 56 is provided at the lower end of the backing support portion 55. The pin member 11, the shoulder member 12, the clamp member 13, and the backing member 56 are attached to the backing support portion 55 at positions facing each other. The object to be joined 60 is arranged between the pin member 11, the shoulder member 12, the clamp member 13, and the backing member 56.

The pin member 11, the shoulder member 12, and the clamp member 13 are fixed to the tool fixture 52 composed of the rotary tool fixture 521 and the clamp fixture 522. Specifically, the pin member 11 and the shoulder member 12 are fixed to the rotary tool fixture 521, and the clamp member 13 is fixed to the clamp fixture 522 via the clamp drive 41. Then, the rotary tool fixture 521 is supported by the clamp fixture 522 via the rotary driver 57. The clamp drive 41 is composed of a spring.

Further, the pin member 11, the shoulder member 12, and the clamp member 13 are driven forward and backward in the vertical direction by the advance / retreat drive 53 composed of the pin drive 531 and the shoulder drive 532.

The pin member 11 is formed in a columnar shape and is supported by a rotary tool fixture 521, although not shown in detail in FIG. Further, the pin member 11 is rotated by the rotation drive 57 around the axis Xr (rotation axis) corresponding to the axis of the pin member 11, and by the pin drive 531 in the arrow P1 direction, that is, the axis Xr direction (FIG. 1). In the vertical direction), it is configured to be able to move forward and backward.

The pin drive 531 may be composed of, for example, a linear actuator. The linear actuator may be composed of, for example, a servomotor and a rack and pinion, a servomotor and a ball screw, an air cylinder, or the like.

The shoulder member 12 is formed in a cylindrical shape having a hollow shape, and is supported by the rotary tool fixture 521. A pin member 11 is inserted in the hollow of the shoulder member 12. In other words, the shoulder member 12 is arranged so as to surround the outer peripheral surface of the pin member 11.

Further, the shoulder member 12 is configured to be rotated around the same axis Xr as the pin member 11 by the rotation drive 57, and can be moved forward and backward along the arrow P2 direction, that is, the axis Xr direction by the shoulder drive 532. There is.

The shoulder drive 532 may be composed of, for example, a linear actuator. The linear actuator may be composed of, for example, a servomotor and a rack and pinion, a servomotor and a ball screw, an air cylinder, or the like.

As described above, the pin member 11 and the shoulder member 12 (rotary tool) are both supported by the same rotary tool fixture 521 in the present embodiment, and both are integrally rotated around the axis Xr by the rotary drive 57. To do. Further, the pin member 11 and the shoulder member 12 are configured to be movable back and forth along the axis Xr direction by the pin drive 531 and the shoulder drive 532, respectively.

In the first embodiment, the pin member 11 can move forward and backward independently, and the pin member 11 and the shoulder member 12 can move forward and backward as the shoulder member 12 moves forward and backward. Each may be configured to be able to move forward and backward independently.

Similar to the shoulder member 12, the clamp member 13 is formed in a cylindrical shape having a hollow shape, and is provided so that its axis coincides with the axis Xr. A shoulder member 12 is inserted in the hollow of the clamp member 13.

That is, the cylindrical shoulder member 12 is arranged so as to surround the outer peripheral surface of the pin member 11, and the cylindrical clamp member 13 is arranged so as to surround the outer peripheral surface of the shoulder member 12. In other words, the clamp member 13, the shoulder member 12, and the pin member 11 each have a coaxial core-shaped nested structure.

Further, the clamp member 13 is configured to press the object to be joined 60 from one surface (surface). As described above, the clamp member 13 is supported by the clamp fixture 522 via the clamp drive 41 in the first embodiment. The clamp drive 41 is configured to urge the clamp member 13 toward the backing member 56 side. The clamp member 13 (including the clamp drive 41 and the clamp fixture 522) is configured to be able to advance and retreat in the arrow P3 direction (the same direction as the arrow P1 and the arrow P2) by the shoulder drive 532.

Although the clamp drive 41 is composed of a spring in the first embodiment, the clamp drive 41 is not limited to this. The clamp drive 41 may have a configuration in which the clamp member 13 is urged or pressed, and for example, a mechanism using gas pressure, hydraulic pressure, a servomotor or the like can be preferably used.

The pin member 11, the shoulder member 12, and the clamp member 13 have a tip surface 11a, a tip surface 12a, and a tip surface 13a, respectively. Further, the pin member 11, the shoulder member 12, and the clamp member 13 are moved back and forth by the advance / retreat drive 53, so that the tip surface 11a, the tip surface 12a, and the tip surface 13a are each the surface of the object to be joined 60. It comes into contact with the object to be joined) and presses the object 60 to be joined.

Further, the shoulder member 12 is configured to satisfy Rs> 2 ^1/2 × Rp, where Rs is the radius of the tip surface 12a of the shoulder member 12 and Rp is the radius of the tip surface 11a of the pin member 11. ing. In other words, the shoulder member 12 is configured such that the area of the annular tip surface 12a is larger than the area of the circular tip surface 11a of the pin member 11.

Thereby, the joining area (the area where the new surface is formed) can be increased as compared with the joining method of dissimilar metal members disclosed in Patent Document 1. Therefore, the joining strength can be increased as compared with the joining method of dissimilar metal members disclosed in Patent Document 1.

In the first embodiment, the backing member 56 is configured to be supported by a flat surface (supporting surface 56a) so as to abut the back surface of the flat plate-shaped object to be joined 60. The structure of the backing member 56 is not particularly limited as long as it can appropriately support the object to be joined 60 so that friction stir welding can be performed. The backing member 56 may be configured so that, for example, a backing member 56 having a plurality of types of shapes is separately prepared and can be removed from the backing support portion 55 and replaced depending on the type of the object to be joined 60. Good.

The object to be joined 60 has two plate-shaped first members 61 and second members 62. The first member 61 is arranged so as to face the pin member 11 and the shoulder member 12, and is made of a material having a melting point lower than that of the second member 62.

The material to be joined 60 may be coated with a sealant material on the contact portion (contact surface) between the first member 61 and the second member 62 that are overlapped with each other. The sealant material may be a sealing material or an adhesive. As the sealant material, for example, polysulfide-based synthetic rubber, natural rubber, silicone rubber, synthetic rubber such as fluororubber, synthetic resin such as tetrafluoroethylene rubber resin, and the like can be used.

The first member 61 includes at least one of a metal material (for example, aluminum, aluminum alloy, magnesium alloy, etc.), a thermoplastic (for example, polyamide, etc.), and a fiber reinforced plastic (for example, carbon fiber reinforced plastic, etc.). One material may be used. As the aluminum alloy, various aluminum alloys can be used. For example, Al—Mg—Si based alloy (A6061) or Al—Si—Mg based alloy (AC4C) may be used.

Further, as the second member 62, a metal material (for example, steel, titanium, etc.) may be used. As the steel, various types of steel can be used, and mild steel or high-strength steel may be used. Further, an oxide film may be formed on the surface of the steel, or a plating layer (for example, zinc plating) may be formed. The steel sheet on which the zinc plating is formed may be a hot-dip galvanized steel sheet (GI steel sheet), an alloyed hot-dip galvanized steel sheet (GA steel sheet), a galvanized steel sheet, or aluminum. It may be a silicon-plated hot-stamped steel sheet. Further, the thickness of the plating layer may be 2 μm to 50 μm.

In the first embodiment, a form in which the object to be joined 60 is composed of a plate-shaped first member 61 and a plate-shaped second member 62 is adopted, but the object to be joined is not limited to this. The shape of the 60 (first member 61 and second member 62) is arbitrary, and may be, for example, a rectangular parallelepiped shape or an arc shape. Further, the object to be joined 60 may have three or more members.

Further, the specific configurations of the pin member 11, the shoulder member 12, the tool fixing device 52, the advancing / retreating drive 53, the clamp member 13, the backing support portion 55, and the rotary drive 57 in the first embodiment are described above. The configuration is not limited to this, and a configuration widely known in the field of friction stir welding can be preferably used. For example, the pin drive 531 and the shoulder drive 532 may be composed of a motor, a gear mechanism, or the like known in the field of friction stir welding.

Further, in the first embodiment, the backing support portion 55 is composed of a C-type gun, but the present invention is not limited to this. The backing support portion 55 supports the pin member 11, the shoulder member 12, and the clamp member 13 so as to be movable back and forth, and the backing member 56 is placed at a position facing the pin member 11, the shoulder member 12, and the clamp member 13. It may be configured in any way as long as it can be supported.

Further, in the first embodiment, the configuration including the clamp member 13 is adopted, but the present invention is not limited to this, and a configuration without the clamp member 13 may be adopted. In this case, for example, the clamp member 13 may be detachably configured from the backing support portion 55, if necessary.

Further, the friction stir point joining device 50 according to the first embodiment adopts a form arranged in a friction stir point joining robot device (not shown). Specifically, the backing support portion 55 is attached to the tip of the arm of the robot device.

Therefore, the backing support portion 55 can also be considered to be included in the friction stir welding robot device. The specific configuration of the friction stir point joining robot device including the backing support portion 55 and the arm is not particularly limited, and a configuration known in the field of friction stir welding such as an articulated robot can be preferably used. ..

The friction stir welding point joining device 50 (including the backing support portion 55) is not limited to the case where it is applied to a friction stir welding point joining robot device, for example, an NC machine tool, a large C frame, and the like. It can also be suitably applied to known processing equipment such as an auto riveter.

Further, in the friction stir point joining device 50 according to the first embodiment, two or more pairs of robots face a portion of the friction stir point joining device 50 other than the backing member 56 with the backing member 56. It may be configured as follows. Further, the friction stir point joining device 50 may adopt a form in which the object to be joined 60 is hand-held as long as it is possible to stably perform friction stir point joining to the object to be joined 60. A form in which the robot is used as the positioner of the object to be welded 60 may be adopted.

[Control configuration of friction stir welding device]
Next, the control configuration of the friction stir welding point joining device 50 according to the first embodiment will be specifically described with reference to FIG.

FIG. 2 is a block diagram schematically showing a control configuration of the friction stir welding device shown in FIG.

As shown in FIG. 2, the friction stir welding point joining device 50 includes a controller 51, a storage device 31, an input device 32, and a position detector 33.

The controller 51 is configured to control each member (each device) constituting the friction stir welding point joining device 50. Specifically, the controller 51 reads out and executes software such as a basic program stored in the storage device, thereby forming a pin drive 531 and a shoulder drive 532, and a rotary drive. 57 and.

Thereby, it is possible to switch the advance movement or the backward movement of the pin member 11 and the shoulder member 12, control the tip position, the movement speed, the movement direction, etc. of the pin member 11 and the shoulder member 12 at the time of the advance / retreat movement. .. In addition, it is possible to control the pressing force that presses the object 60 of the pin member 11, the shoulder member 12, and the clamp member 13. Further, the rotation speeds of the pin member 11 and the shoulder member 12 can be controlled.

The controller 51 may be composed of a single controller 51 for centralized control, or may be composed of a plurality of controllers 51 for distributed control in cooperation with each other. Further, the controller 51 may be composed of a microcomputer, an MPU, a PLC (Programmable Logic Controller), a logic circuit, or the like.

The storage device 31 stores a basic program and various data in a readable manner, and the storage device 31 is composed of a known memory, a storage device such as a hard disk, or the like. The storage device 31 does not have to be a single device, and may be configured as a plurality of storage devices (for example, a random access memory and a hard disk drive). When the controller 51 and the like are composed of a microcomputer, at least a part of the storage device 31 may be configured as the internal memory of the microcomputer or may be configured as an independent memory.

It should be noted that the storage device 31 may store data so that the data can be read from other than the controller 51, or the data may be written from the controller 51 or the like. Not to mention.

The input device 32 enables the controller 51 to input various parameters related to the control of friction stir welding, other data, and the like, and is a known input device such as a keyboard, a touch panel, and a button switch group. It is configured. In the first embodiment, at least data such as joining conditions of the object to be joined 60, for example, the thickness and material of the object to be joined 60 can be input by the input device 32.

The position detector 33 is configured to detect the position information of the tip (tip surface 12a) of the shoulder member 12 and output the detected position information to the controller 51. As the position detector 33, for example, a displacement sensor, an LVDT, an encoder or the like may be used.

[Operation of friction stir welding device (operation method)]
Next, the operation of the friction stir welding point joining device 50 according to the first embodiment will be specifically described with reference to FIGS. 3, 4A, and 4B. In addition, in FIGS. 4A and 4B, a case where the first member 61 and the second member 62 are used as the object to be joined 60 and these are overlapped and connected by point joining is given as an example.

FIG. 3 is a flowchart showing an example of the operation of the friction stir welding device according to the first embodiment. 4A and 4B are process diagrams schematically showing an example of each process of friction stir point joining by the friction stir point joining device shown in FIG. 1.

In FIGS. 4A and 4B, a part of the friction stir welding device is omitted, the arrow r indicates the rotation direction of the pin member 11 and the shoulder member 12, and the block arrow F indicates the first member 61 and the first member 61. 2 The direction of the force applied to the member 62 is shown. Further, although a force is also applied to the first member 61 and the second member 62 from the backing member 56, they are not shown in FIGS. 4A and 4B for convenience of explanation. Further, the shoulder member 12 is shaded and hatched in order to clarify the distinction between the pin member 11 and the clamp member 13.

First, the operator (operator) places the object to be joined 60 on the support surface 56a of the backing member 56. Then, the operator operates the input device 32 to input the joining execution of the object to be joined 60 to the controller 51. The robot may place the object to be joined 60 on the support surface 56a of the backing member 56.

Then, as shown in FIG. 3, the controller 51 drives the rotation drive 57 to drive the pin member 11 and the shoulder member 12 at a predetermined first rotation speed (for example, 200 to 3000 rpm). Rotate (step S101; see step (1) in FIG. 4A).

Next, the controller 51 drives the advance / retreat drive 53 (shoulder drive 532) to rotate the pin member 11 and the shoulder member 12, and then presses the pin member 11, the shoulder member 12, and the clamp member 13. The tip surface 11a of the pin member 11, the tip surface 12a of the shoulder member 12, and the tip surface 13a of the clamp member 13 (not shown in FIGS. 4A and 4B) are brought close to the object 60 of the object 60. It is brought into contact with the surface 60c (the portion to be joined of the object to be joined 60) (step S102; see step (2) in FIG. 4A).

At this time, the controller 51 presses the object to be joined 60 with a predetermined pressing pressure (for example, a predetermined value included in the range of 3 kN to 15 kN) set in advance by the pin member 11, the shoulder member 12, and the clamp member 13. The advance / retreat drive 53 (Shoulder drive 532) is controlled so as to do so.

As a result, the first member 61 and the second member 62 are sandwiched between the clamp member 13 and the backing member 56, and the clamp member 13 is urged toward the surface 60c side of the object to be joined 60 by the contraction of the clamp drive 41. , Clamping force is generated.

Further, in this state, neither the pin member 11 nor the shoulder member 12 moves back and forth, so that the surface 60c of the object to be joined 60 is "preheated". As a result, the constituent material in the contact region of the first member 61 is softened by generating heat due to friction, and a plastic flow portion 60a is generated in the vicinity of the surface 60c of the object to be joined 60.

Next, the controller 51 drives the advancing / retreating drive 53 so that the tip surface 11a of the pin member 11 is immersed in the tip surface 12a of the shoulder member 12 (step S103). At this time, the controller 51 may drive the advance / retreat drive 53 (pin drive 531) so that the pin member 11 is separated from the object to be joined 60. Further, the controller 51 may drive the advance / retreat drive 53 (shoulder drive 532) so that the shoulder member 12 is press-fitted into the object to be joined 60.

As a result, the tip end portion of the shoulder member 12 is press-fitted into the jointed portion of the object to be joined 60 in a rotated state.

Next, the controller 51 acquires the position information of the tip of the shoulder member 12 from the position detector 33 (step S104). Next, the controller 51 determines whether or not the position information of the tip of the shoulder member 12 acquired in step S104 has reached a predetermined first position set in advance (step S105).

Here, the first position can be set in advance by an experiment or the like, and is an arbitrary position in the first member 61. More specifically, the first position is a position of the contact surface 61a of the first member 61 with the second member 62 and a position of 25% or less of the thickness t (thickness dimension) of the first member 61 from the contact surface 61a. It is an arbitrarily set position between and.

Further, the first position is the thickness of the first member 61 from the contact surface 61a from the viewpoint of removing the plating layer (plating film) or oxide film formed on the surface of the second member 62 by the plastic flow portion 60a. The position may be 25% or less of t (thickness dimension).

Further, the first position may be a position 10 μm or more above (inward) from the contact surface 61a from the viewpoint of suppressing wear of the tip of the shoulder member 12. Further, the first position may be the contact surface 61a from the viewpoint of facilitating the position control of the tip of the shoulder member 12 by the controller 51.

As a result, the softened portion (plastic flow portion 60a) of the object to be joined 60 reaches the surface of the first member 61 to the second member 62. Then, the plating layer (plating film) or oxide film formed on the surface of the second member 62 is removed by the plastic flow portion 60a, and the portion of the second member 62 that is in contact with the plastic flow portion 60a is removed. A new surface is formed.

The softened material of the plastic flow portion 60a is pushed away by the shoulder member 12 and flows from directly below the shoulder member 12 directly below the pin member 11, so that the pin member 11 retracts and floats with respect to the shoulder member 12 (FIG. FIG. See step (3) of 4A).

Further, the plating layer (plating film) formed on the surface of the second member 62 or the impurities forming the oxide film (for example, zinc, iron oxide, etc.) also flow directly under the pin member 11. Further, a part of the impurities flows out of the outer peripheral surface of the tip portion of the shoulder member 12.

When the controller 51 determines that the position information of the tip of the shoulder member 12 acquired in step S104 has not reached the first position (No in step S105), the controller 51 returns to step S104 and acquires it in step S104. The processing of step S104 and step S105 is repeated until it is determined that the position information of the tip end portion of the shoulder member 12 has reached the first position.

On the other hand, when the controller 51 determines that the position information of the tip of the shoulder member 12 acquired in step S104 has reached the first position (Yes in step S105), the controller 51 executes the process of step S106.

In step S106, the controller 51 drives the advancing / retreating drive 53 (pin drive 531) so that the pin member 11 advances toward the object 60, and / or the controller 51 is the shoulder member 12. Drives the advance / retreat drive 53 (pin drive 531) so as to move away from the object to be joined 60.

Specifically, the controller 51 controls the advancing / retreating drive 53 to align the tip surface 11a of the pin member 11 and the tip surface 12a of the shoulder member 12 to the extent that almost no step is formed between them (they are flush with each other). ).

As a result, the pin member 11 gradually advances toward the first member 61, and the shoulder member 12 retracts from the first member 61. At this time, the softened portion of the plastic flow portion 60a flows from directly below the pin member 11 to directly below the shoulder member 12 (recess formed by press-fitting the shoulder member 12).

Then, the tip surface 11a of the pin member 11 and the tip surface 12a of the shoulder member 12 move to the vicinity of the surface 60c of the object to be joined 60. As a result, the surface 60c of the object to be joined 60 is shaped to obtain a substantially flat surface to the extent that substantially no recess is formed (see step (4) in FIG. 4B).

In the process of step S103 and / or step S106, the controller 51 sets the area of the tip surface of the pin member 11 as Ap, the area of the tip surface of the shoulder member 12 as As, and the press-fitting depth of the pin member 11 as Pp. , When the press-fitting depth of the shoulder member 12 is Ps, the following equation (I)
Ap ・ Pp + As ・ Ps = Tx ・・・ (I)
It is preferable to control the advance / retreat drive 53 so as to reduce the absolute value of the tool average position Tx defined in, and more preferably to control the advance / retreat drive 53 so that the tool average position Tx = 0. .. Since specific control for reducing the absolute value of the tool average position Tx is disclosed in detail in Japanese Patent Application Laid-Open No. 2012-196682, the description thereof will be omitted here.

Further, the controller 51 may control the advance / retreat drive 53 so that the tip surface 11a of the pin member 11 is located at the first position in the process of step S106. In this case, the controller 51 advances and retreats so that the tip surface 11a of the pin member 11 and the tip surface 12a of the shoulder member 12 are flush with each other after the tip surface 11a of the pin member 11 is located at the first position. The drive 53 may be controlled.

Next, the controller 51 drives the advancing / retreating drive 53 so as to separate the pin member 11, the shoulder member 12, and the clamp member 13 from the object to be joined (step S107). Then, the controller 51 controls the rotation drive 57 to stop the rotation of the pin member 11 and the shoulder member 12 (step S108; see step (5) of FIG. 4B), and this program (joint 60). The joining process) is completed.

As a result, the rotation (and pressing) due to the contact between the pin member 11 and the shoulder member 12 is not applied to the first member 61 and the second member 62, so that the plastic flow stops at the plastic flow portion 60a and the plastic flow portion 60a And the new surface of the second member 62 are joined.

In the friction stir welding device 50 according to the first embodiment, which is configured in this way, the controller 51 brings the tip of the shoulder member 12 in the rotated state to the first position and is in the rotated state. The advance / retreat drive 53 and the rotary drive 57 are configured to operate so that the pin member 11 of the above is retracted from the jointed portion of the object 60 to be joined.

As a result, when the pin member 11 and the shoulder member 12 have the same rotation speed, the case where the shoulder member 12 is press-fitted into the bonded portion is more than the case where the pin member 11 is press-fitted into the bonded portion. The peripheral speed increases.

Therefore, when the shoulder member 12 is press-fitted, the force for causing plastic flow in the bonded portion is larger than when the pin member 11 is press-fitted, and the press-fitting speed into the bonded portion is reduced. It can be suppressed. Therefore, in the friction stir welding point joining device 50 according to the first embodiment, the joining time can be shortened as compared with the joining method of dissimilar metal members disclosed in Patent Document 1.

Further, by controlling the controller 51 so that the tip of the shoulder member 12 reaches the first position, the softened portion (plastic flow portion 60a) of the object to be joined 60 is changed from the first member 61 to the second member. It reaches the surface of 62.

Then, the plating layer (plating film) or oxide film formed on the surface of the second member 62 is removed by the plastic flow portion 60a, and the portion of the second member 62 that is in contact with the plastic flow portion 60a is removed. A new surface is formed.

Further, the removed plating layer (plating film) or impurities (for example, zinc) forming the oxide film flow directly under the pin member 11. Further, a part of the impurities flows out of the outer peripheral surface of the tip end portion of the shoulder member 12.

Therefore, when the softened portion of the plastic flow portion 60a flows from directly below the pin member 11 to directly below the shoulder member 12 (recess formed by press-fitting the shoulder member 12), the amount of impurities that flow out is the amount of the shoulder member. The amount of impurities flowing directly under 12 is reduced.

On the other hand, in the method of joining dissimilar metal members disclosed in Patent Document 1, since the probe (pin member) is press-fitted, the softened portion (plastic flow portion 60a) of the object to be joined 60 is pushed away by the probe, and the probe is used. It flows from directly below the shoulder member directly below the shoulder member, and the shoulder member moves upward with respect to the probe. At this time, the plating layer (plating film) formed on the surface of the second member 62 or the impurities forming the oxide film (for example, zinc) also flow directly under the shoulder member.

Since the shoulder member moves upward, the softened portion and impurities of the plastic flow portion 60a hardly flow out to the outside of the outer peripheral surface of the tip portion of the shoulder member.

Therefore, when the softened portion of the plastic flow portion 60a flows from directly under the shoulder member to directly under the probe (recess formed by press-fitting the probe), the amount of impurities flowing directly under the probe may decrease. Absent.

Therefore, in the friction stir welding point joining device 50 according to the first embodiment, as compared with the joining method of dissimilar metal members disclosed in Patent Document 1, the portion that comes into contact with the new surface (generated by press fitting of the shoulder member 12). The amount of impurities in the recesses) can be reduced.

As a result, the friction stir welding point joining device 50 according to the first embodiment can increase the joining strength as compared with the joining method of dissimilar metal members disclosed in Patent Document 1.

Further, in the friction stir welding device 50 according to the first embodiment, when the shoulder member 12 has a radius of the tip surface 12a of the shoulder member 12 as Rs and a radius of the tip surface 11a of the pin member 11 as Rp. , Rs> 2 ^1/2 × Rp. In other words, the shoulder member 12 is configured such that the area of the annular tip surface 12a is larger than the area of the circular tip surface 11a of the pin member 11.

Thereby, the joining area (the area where the new surface is formed) can be increased as compared with the joining method of dissimilar metal members disclosed in Patent Document 1. Therefore, in the friction stir welding point joining device 50 according to the first embodiment, the joining strength can be increased as compared with the joining method of dissimilar metal members disclosed in Patent Document 1.

[Test example]
Next, a joining test of the object to be joined 60 by the friction stir point joining device 50 according to the first embodiment and the joining method of dissimilar metal members disclosed in Patent Document 1 will be described.

(Test Example 1)
A joining test of the object to be joined 60 was performed using the friction stir welding point joining device 50 according to the first embodiment. The first position, which is the target arrival position of the shoulder member 12, is set to a position 0.1 mm above the contact surface (lower surface) of the first member 61 with the second member 62.

(Comparative Example 1)
As Comparative Example 1, a joining test of the object to be joined 60 was carried out by the joining method of dissimilar metal members disclosed in Patent Document 1.

Specifically, using the friction stir welding point joining device 50 according to the first embodiment, the pin driver 531 is driven so that the pin member 11 is press-fitted into the joined portion in the process of step S103. , Set the program. At this time, the program was set so that the tip of the pin member 11 was located 0.1 mm above the contact surface (lower surface) of the first member 61 with the second member 62.

Further, in the process of step S106, the program was set so that the advance / retreat drive 53 (pin drive 531) was driven so that the pin member 11 was separated from the object to be joined 60.

(Joining condition 1)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 0.7 mm 270 MPa class non-plated steel plate was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1000 rpm.

Then, a tensile shear test (JIS Z 3136) and a cross tensile test (JIS Z 3137) were performed on the joined objects 60 by the friction stir welding apparatus of Comparative Example 1 and Test Example 1, respectively.

(Joining condition 2)
A 3 mm aluminum plate (A6061) was used as the first member 61, and a 0.7 mm 270 MPa class non-plated steel plate was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1000 rpm.

(Test result 1)
FIG. 5 is a graph showing the results of a tensile shear test and a cross tensile test of a material to be joined by friction stir welding under the joining condition 1 using the friction stir point joining devices of Comparative Example 1 and Test Example 1.

Further, FIG. 6 is a cross-sectional photograph of an object to be welded by friction stir point joining under the joining condition 1 or joining condition 2 using the friction stir point joining device of Comparative Example 1 and Test Example 1.

As shown in FIG. 5, the tensile shear strength of the object to be joined 60, which was subjected to friction stir point welding under the joining condition 1 by using the friction stir welding device of Comparative Example 1, was 1345N and the cross tensile strength was 84N. It was. On the other hand, the tensile shear strength of the object to be joined 60, which was subjected to friction stir point joining under the joining condition 1 using the friction stir point joining device of Test Example 1, was 2939N, and the cross tensile strength was 299N.

From these results, in the friction stir welding point joining device 50 according to the first embodiment, the joining strength can be sufficiently increased as compared with the joining method of dissimilar metal members disclosed in Patent Document 1. It has been shown.

Further, as shown in FIG. 6, even if the thickness of the first member 61 of the object to be joined 60 is increased to 3 mm, sufficient plastic flow can be achieved, and the first member 61 and the second member 62 can be joined. It was shown that

(Test Example 2)
A joining test of the object to be joined 60 was performed using the friction stir welding point joining device 50 according to the first embodiment. It should be noted that the first position, which is the target arrival position of the shoulder member 12, is 0.1, 0.2, 0.25, and 0.1, 0.2, 0.25 above, respectively, from the contact surface (lower surface) of the first member 61 with the second member 62. It was set at a position of 0.3 mm.

(Test result 2)
FIG. 7 is a graph showing the results of a cross tensile test of a material to be welded by friction stir point welding under the joining condition 1 using the friction stir point joining device of Test Example 2. In FIG. 7, the result of the cross tensile test when the first position is set to the position 0.1 mm above the contact surface of the first member 61 with the second member 62 is used as a reference.

As shown in FIG. 7, even when the first position is set to a position 0.25 mm above the contact surface of the first member 61 with the second member 62, the joint strength can be sufficiently increased. It was shown that it can be done.

Therefore, by setting the first position to a position of 25% or less of the thickness dimension of the first member from the contact surface of the first member 61 with the second member 62, the first position is formed on the surface of the second member 62. It was shown that the plating layer (plating film) or the oxide film on the surface was removed to form a new surface, which could be joined to the first member 61.

(Test Example 3)
Using the friction stir point joining device 50 according to the first embodiment, joining tests of various objects to be joined 60 were performed. The first position, which is the target arrival position of the shoulder member 12, is set to a position 0.1 mm above the contact surface (lower surface) of the first member 61 with the second member 62.

(Joining condition 3)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 0.7 mm 270 MPa class non-plated steel plate was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1200 rpm.

(Joining condition 4)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 1.2 mm 270 MPa class hot-dip galvanized steel sheet (GI) was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 2000 rpm.

(Joining condition 5)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 1.2 mm 270 MPa class alloyed hot-dip galvanized steel sheet (GA) was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1200 rpm.

(Joining condition 6)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 1.2 mm 980 MPa class non-plated steel plate was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1200 rpm.

Then, a tensile shear test (JIS Z 3136) was performed on each of the joined objects 60 by the friction stir welding device of Test Example 3.

(Joining condition 7)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 1.2 mm 980 MPa class alloyed hot-dip galvanized steel sheet (GA) was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1200 rpm.

(Test result 3)
FIG. 8 is a graph showing the results of a tensile shear test of an object to be welded by friction stir point joining under the joining conditions 3 to 6 using the friction stir point joining device of Test Example 3.

Further, FIG. 9 is a cross-sectional photograph of the object to be welded by friction stir point joining under the joining conditions 3 to 7 using the friction stir point joining device of Test Example 3.

As shown in FIG. 8, the tensile shear strength of the workpiece 60 to be joined by friction stir point welding under the joining conditions 3 to 6 using the friction stir point joining device of Test Example 3 is 2.0 kN or more, and various steel plates. It was shown that the bonding strength can be sufficiently increased even by using.

Further, as shown in FIG. 9, it was shown that the object to be joined 60 can be joined by using a 980 MPa class alloyed hot-dip galvanized steel sheet (GA) as the second member 62.

(Test Example 4)
A joining test of the object to be joined 60 was performed using the friction stir welding point joining device 50 according to the first embodiment. The first position, which is the target arrival position of the shoulder member 12, is set to a position 0.1 mm above the contact surface (lower surface) of the first member 61 with the second member 62. Further, a sealant material (adhesive) was applied to the contact surface between the first member 61 and the second member 62.

(Joining condition 8)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 0.7 mm 270 MPa class non-plated steel plate was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1200 rpm.

(Test result 4)
FIG. 10 is a cross-sectional photograph of an object to be welded by friction stir point bonding under the bonding condition 8 using the friction stir point bonding device of Test Example 4. The joining range shown in FIG. 10 means a portion where the pin member 11 and the shoulder member 12 come into contact with the upper surface of the object to be joined 60.

As shown in FIG. 10, it was shown that a large amount of the sealant material (adhesive) applied to the contact surface between the first member 61 and the second member 62 was present directly under the pin member 11.

As a result, by executing step S106, even if the softened portion of the plastic flow portion 60a flows from directly below the pin member 11 to directly below the shoulder member 12 (recess formed by press-fitting the shoulder member 12), the sealant It was suggested that the material did not flow directly under the shoulder member 12 (the recess created by press-fitting the shoulder member 12), but remained (retained) directly under the pin member 11.

(Test Example 5)
A joining test of the object to be joined 60 was performed using the friction stir welding point joining device 50 according to the first embodiment. The first position, which is the target arrival position of the shoulder member 12, is set to a position 0.1 mm above the contact surface (lower surface) of the first member 61 with the second member 62. Further, when the tip of the shoulder member 12 reached the first position in step S105, the pin member 11 and the shoulder member 12 were pulled upward to stop the joining test.

(Comparative Example 2)
As Comparative Example 2, a joining test of the object to be joined 60 was carried out by the joining method of dissimilar metal members disclosed in Patent Document 1.

Further, as in Test Example 5, when the tip of the pin member 11 reaches the first position in step S105, the pin member 11 and the shoulder member 12 are pulled upward to stop the joining test.

(Joining condition 9)
A 1 mm aluminum plate (A6061) was used as the first member 61, and a 1.2 mm 270 MPa class hot-dip galvanized steel sheet (GI) was used as the second member 62. Further, the first rotation speed, which is the rotation speed of the pin member 11 and the shoulder member 12, was set to 1200 rpm.

(Test result 5)
FIG. 11 is a cross-sectional photograph of an object to be welded under friction stir welding condition 9 using the friction stir point joining devices of Comparative Example 2 and Test Example 5. In FIG. 11, the pin member is schematically shown by a broken line, and the shoulder member is schematically shown by a alternate long and short dash line.

As shown in FIG. 11, when the object to be welded 60 is friction stir point welded using the friction stir point joining device of Comparative Example 2, the softened portion of the plastic flow portion 60a is pushed away by the pin member 11. , Flows from directly below the pin member 11 to directly below the shoulder member 12. At this time, it was shown that impurities (for example, zinc and the like) forming the plating layer (plating film) formed on the surface of the second member 62 also flowed directly under the shoulder member 12.

On the other hand, when the object to be joined 60 is subjected to friction stir point joining using the friction stir point joining device of Test Example 5, the softened portion of the plastic flow portion 60a is pushed away by the shoulder member 12, and the shoulder member 12 It flows from directly below to directly below the pin member 11.

At this time, it was shown that most of the impurities (for example, zinc and the like) forming the plating layer (plating film) formed on the surface of the second member 62 flowed directly under the pin member 11. It was also shown that some of the impurities flowed out of the outer peripheral surface of the tip of the shoulder member 12.

Therefore, when the softened portion of the plastic flow portion 60a flows from directly below the pin member 11 to directly below the shoulder member 12 (recess created by press-fitting the shoulder member 12), the amount of impurities that flow out is the amount of the shoulder member. It was suggested that the amount of impurities flowing directly under 12 was reduced.

Further, in consideration of the result of Test Example 4 (test result 4), the impurities flowing directly under the pin member 11 are such that the softened portion of the plastic flow portion 60a is directly below the pin member 11 to directly below the shoulder member 12. It is considered that when it flows, it remains (retains) directly under the pin member 11.

From the above description, many improvements or other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be construed only as an example and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the present invention. The details of its structure and / or function can be substantially changed without departing from the present invention. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above embodiment.

The friction stir welding point joining device and its operating method of the present invention are useful because the joining time can be shortened as compared with the conventional joining method of dissimilar metal members.

11 Pin member

11a Tip surface

12a Tip surface 12 Shoulder member 13 Clamp member 13a Tip surface 31 Memory device 32 Input device 33 Position detector 41 Clamp drive 50 Friction stir welding device 51 Controller 52 Tool fixture 53 Advance / retreat drive 55 Backing support 56 Backing member 56a Support surface 57 Rotation drive 60 Jointed object 60a Plastic flow part 60c Surface 61 First member 61a Contact surface 62 Second member 521 Rotating tool fixture 522 Clamp fixture 531 Pin drive 532 Shoulder drive t Thickness Xr Axis

Claims

A friction stir welding device that has a first member and a second member and joins objects to be joined by softening them with frictional heat.
The friction stir welding device
The pin member formed in a columnar shape and
A shoulder member that is formed in a cylindrical shape and has the pin member inserted inside.
A rotary drive that rotates the pin member and the shoulder member around an axis that coincides with the axis of the pin member.
An advance / retreat drive that moves the pin member and the shoulder member forward / backward along the axis, respectively.
With a controller,
The first member is arranged so as to face the pin member and the shoulder member, and is made of a material having a melting point lower than that of the second member.
The controller operates the rotation driver and the advance / retreat drive so as to press the jointed portion of the object to be joined in a state where the pin member and the shoulder member are rotated (A).
The tip of the shoulder member in the rotated state reaches a predetermined first position set in advance in the first member, and the pin member in the rotated state is retracted from the jointed portion of the object to be joined. When the advance / retreat drive and the rotation drive are operated (B) so as to be performed,
After the (B), the rotated state of the shoulder member is pulled out from the part to be joined of the object to be joined, and the pin member in the state of being rotated advances toward the part of the object to be welded. (C) The friction stir welding point joining device is configured to operate the rotary drive and the advance / retreat drive so as to perform.
The friction stir welding device according to claim 1, wherein the first position is a position of 25% or less of the thickness dimension of the first member from the contact surface of the first member with the second member.
The shoulder member has the following equation Rs> 2 1/2 × Rp, where Rs is the radius of the tip surface of the shoulder member and Rp is the radius of the tip surface of the pin member.
The friction stir welding device according to claim 1 or 2, which is configured to satisfy the above conditions.
The friction stir welding point joining apparatus according to any one of claims 1 to 3, wherein a sealant material is applied to a contact portion between the first member and the second member which are overlapped with each other. ..
It is an operation method of a friction stir point joining device having a first member and a second member and joining by softening an object to be joined by frictional heat.
The friction stir welding device
The pin member formed in a columnar shape and
A shoulder member that is formed in a cylindrical shape and has the pin member inserted inside.
A rotary drive that rotates the pin member and the shoulder member around an axis that coincides with the axis of the pin member.
An advance / retreat drive that moves the pin member and the shoulder member forward / backward along the axis, respectively.
With a controller,
The first member is arranged so as to face the pin member and the shoulder member, and is made of a material having a melting point lower than that of the second member.
The controller operates the rotation driver and the advance / retreat drive so as to press the jointed portion of the object to be joined in a state where the pin member and the shoulder member are rotated (A).
The tip of the shoulder member in the rotated state reaches a predetermined first position set in advance in the first member, and the pin member in the rotated state is retracted from the jointed portion of the object to be joined. When the advance / retreat drive and the rotation drive are operated (B) so as to be performed,
After the (B), the rotated state of the shoulder member is pulled out from the part to be joined of the object to be joined, and the pin member in the state of being rotated advances toward the part of the object to be welded. A method of operating a friction stir welding device, which is configured to operate (C) the rotary drive and the advance / retreat drive so as to perform.
The operation of the friction stir welding device according to claim 5, wherein the first position is a position of 25% or less of the thickness dimension of the first member from the contact surface of the first member with the second member. Method.
The shoulder member has the following equation Rs> 2 1/2 × Rp, where Rs is the radius of the tip surface of the shoulder member and Rp is the radius of the tip surface of the pin member.
The method of operating the friction stir welding device according to claim 5 or 6, which is configured to satisfy the above conditions.
The friction stir welding point joining apparatus according to any one of claims 5 to 7, wherein a sealant material is applied to a contact portion between the first member and the second member which are overlapped with each other. How to drive.