FRICTION STIR WELDING METHOD OF MEMBERS HAVING DIFFERENT THICKNESS

摘要

PROBLEM TO BE SOLVED: To restrain occurrence of defect at a joined part in the case of applying a butt-joint with a friction-stir welding method under a state having the difference of the surface levels in the joining materials. SOLUTION: A member having larger thickness is disposed to the larger side of relative velocity between a rotating tool and a material to be joined decided with the rotating direction of the rotating tool and the joining direction to perform the friction stir welding.