Weld tab for friction stir welding, and method for producing joint material

摘要

A production method of a joint material includes a tab installation step of installing an end tab on a pair of workpieces to be joined at a joining line therebetween by friction stir welding, a tool installation step of installing a probe of a tool for friction stir welding at a cutout portion; an approach step of moving the tool while rotating itself from an opening into the cutout portion; a waiting step of causing the tool for friction stir welding to standby in the cutout portion at an extension line; and a joining step of starting movement of the tool along the joining line at a time at which a temperature of the workpieces at a joining portion in front of the tool in an advancing direction of the tool in the waiting step is a predetermined temperature or more and joining the workpieces with each other.