Patent ID: 7635075
Filing Date: 2009-12-22
Classification: B23K

Abstract:
1. A friction stir-spot welding apparatus for inserting a welding tool being a symmetry with respect to a shaft, while rotating under a pressure into a portion of a member to be welded, thereby to heat and soften the member in the neighborhood of the welding tool by friction heat so as to integrate the member at a welding portion, characterized in that the device comprises: a driving device for driving the welding tool in the direction of the rotation shaft thereof; and a rotation shaft conversion device for converting the rotation shaft of the welding tool, wherein the welding tool rotation shaft conversion device comprises a hummer one end of which is connected to a welding head swing shaft having one point in the direction of the rotation shaft of the welding tool as a fulcrum; and a stopper to which the other end of the hummer collides when the welding head comes down, wherein the tip portion of the welding tool held by the welding head swings around the welding head swing shaft as the fulcrum when the hummer further comes down from the state where the hummer collides the stopper.