| 摘要 |
PROBLEM TO BE SOLVED: To carry out excellent friction stir welding in the case where a projecting part exists only on one member of an abutting part, a gap on the abutting part is large, or the welding line is a curve. SOLUTION: On the end face of a large diameter part 210 directing a small diameter part 200, a rotary tool provided with an arc-shaped groove 213 is used, and the rotary tool 200 is rotated in the state where the end face of the large diameter part 210 and the small diameter part 220 are inserted in a member. By the rotation, the metal of the member is rotated so as to move to the shaft center of the rotary tool 200 along the groove 213. The arc-shaped groove 213 is directed to the rotating direction. Since the metal of the member moves to the center side, welding can be effected excellently even in the case where a projecting part exists on one side, or the gap is large.
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