| 摘要 |
PROBLEM TO BE SOLVED: To attain satisfactory friction stir welding in friction stir welding using rotary tool having two large diameter parts. SOLUTION: Face plates 11b, 12b of a hollow shape 10 and face plates 21b, 22b of a hollow shape are abutted. On both sides of the abutted part, projecting parts 15, 16, 25, 26 are provided. The rotary tool 50 is provided with a small diameter part 51 between a large diameter part 53 and a large diameter part 54. By clamping the projecting parts 15, 16, 25, 26 of the parts to be joined 11b, 21b (12b, 22b) between two large diameter parts 53, 54, the friction stir welding is conducted. By this way, even if the height and position of the abutting parts against the two large diameter part 53, 54 of the rotary tool are different, only the depths of the large diameter parts against the projecting parts differ and the face plates 11b, 21b (12b, 22b) are not cut. For this reason, the problem that the face plate becomes thin, and the problem on the design and the function do not occur.
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