CLAMP MEMBER FOR DOUBLE-ACTING FRICTION STIR SPOT WELDING DEVICE, DOUBLE-ACTING FRICTION STIR SPOT WELDING DEVICE, AND DOUBLE-ACTING FRICTION STIR SPOT WELDING METHOD

摘要

A clamp member, for a double-acting friction stir spot welding device, is provided for the double-acting friction stir spot welding device to perform friction stir spot welding of a workpiece by using a rotary tool, and presses a surface of the workpiece while the workpiece is supported. The rotary tool has a pin member and a shoulder member. The clamp member includes an end face that comes into surface contact with the surface of the workpiece to press the surface and a protruding portion protruding from the end face in an axial direction and extending around an axis. The protruding portion is configured to press the workpiece, the clamp member surrounding an outer periphery of the shoulder member.