| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of friction stir spot welding, which method can sufficiently secure the joining strength between joined meatal members, and further can prevent or effectively suppress the generation of uneven burrs caused by the friction stir spot welding. SOLUTION: In the method of the friction stir spot welding, respective plate shape portions of a plurality of metallic members to be welded are mounted in the overlapped state, and are pressed by a required pressing force, and then the friction stir spot welding is carried out. In this case, a rotary jig is moved to a temporarily set position to be determined based on the data of the deflection of a supporting stand caused by the application of the pressing force and the data of the thickness of the overlapped portion. After that, the positional control by a servomotor is released at the temporarily set position, and also the torque of the servomotor is controlled. After a predetermined time has elapsed from the start of the torque control, the moved distance of the rotary tool is measured. The position to begin a welding operation is obtained based on the measured moved distance and the temporarily set position. After that, the friction stir spot welding is carried out on the basis of the position to begin the welding operation. COPYRIGHT: (C)2007,JPO&INPIT
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