| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint shape for suppressing degradation of the strength of a welded joint part when a hollow shape is friction-agitation-welded. SOLUTION: The thickness of a face plate 101 (111) between a rib 103 (113) and a rib 105 (115) at an end of the hollow shape 100 (110) is t2 (t5) on the rib 105 (115) side, and t1 on the rib 103 (113) side, and t2 (t5) is larger than t1. The part between the parts of different thickness is smoothly changed. The thickness of t2 (t5) is provided by the protrusion on the other face plate side.
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