METHOD FOR FRICTION STIR WELDING, JIG THEREFOR MEMBER WITH FRICTION STIR-WELDED PORTION, AND TOOL FOR FRICTION STIR WELDING

摘要

A recess portion (18) with a substantially circular horizontal cross-section is provided in the upper end surface of a supporting jig (10). When a probe (8) of a device (7) for friction stir welding is buried in the upper end surface of a layered portion (6), material in the vicinity of the buried portion flows plastically. This causes the plastically flowed material to flows into the recess portion (18), and as a result, the material is stirred in a relatively large region. When the material flowed into the recess portion (18) is cooled and solidified, a friction stir-welded portion-possessing member (42) having a projection portion (44) is obtained.