| 摘要 |
PROBLEM TO BE SOLVED: To provide a friction stir welding method enabling metal members to be welded up to a deep position of a butting part, by reducing a load applied to a friction stir apparatus.SOLUTION: The friction stir welding method comprises: a regular welding step of inserting a rotated agitation pin F2 into a butting part where metal members 1 and 1 are butted each other 1 and performing friction stir welding while only the agitation pin F2 of the rotary tool F out of a friction stir welding apparatus D and the rotary tool F is brought into contact with a metal member 1; an arrangement step of arranging an auxiliary member; and an auxiliary member welding step of welding the metal member 1 and the auxiliary member 4 to each other. The temporary welding rotary tool G for use in the auxiliary member welding step is constituted of a shoulder part G1 and an agitation pin G2, the shoulder part G1 is a part for pressing down plastically fluidized metal. In the auxiliary member welding step, the temporary welding rotary tool G is moved while pushing a lower end surface of the shoulder part G1 to a surface of the metal member 1 and the auxiliary member 4. |
