END TAB FOR FRICTION STIR WELDING AND METHOD FOR PRODUCING JOINT MATERIAL

1 . An end tab for friction stir welding which is arranged to abut against an end surface of a workpiece joined by friction stir welding and is formed with a cutout portion of which a distal end side is positioned on an extension line of a joining line in the workpiece.

2 . The end tab for friction stir welding according to claim 1 , wherein a crossing portion extending in a direction crossing the joining line is formed in the cutout portion.

3 . A production method of a joint material comprising:

a tab installation step of installing an end tab, in which a cutout portion of which a distal end side is positioned on an extension line of a joining line in a workpiece joined by friction stir welding is formed, to abut against an end surface of the workpiece;

a tool installation step of installing a probe of a tool for friction stir welding at the cutout portion;

an approach step of moving the tool toward the distal end side along the cutout portion;

a waiting step of causing the tool for friction stir welding to standby at the distal end side of the cutout portion; and

a joining step of starting movement of the tool at a time at which a temperature of the workpiece 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 workpiece.

4 . A production method of a joint material comprising:

a cutout step of forming a cutout portion in an end surface of the workpiece on a joining line of the workpiece joined by friction stir welding;

a tool installation step of installing a probe of a tool for friction stir welding at the cutout portion;

a waiting step of causing the tool to standby at the distal end side of the cutout portion; and

a joining step of starting movement of the tool at a time at which a temperature of the workpiece 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 workpiece.

5 . The production method of the joint material according to claim 3 , wherein, in the joining step, as the predetermined temperature, the tool starts to move at a time at which a temperature of the workpiece is a temperature greater than or equal to 0.45 times and less than or equal to 0.8 times of a melting point of the workpiece, and the workpiece is joined.

6 . The production method of the joint material according to claim 3 , wherein, as the tool, a bobbin tool configured to perform joining such that the workpiece is sandwiched using a first shoulder and a second shoulder from both surfaces is used, and

the production method of the joint material further comprises: a chamfering step of forming a chamfered portion in an end edge of at least one of the first shoulder side and the second shoulder side on the end surface of the workpiece before the joining step.

7 . The production method of the joint material according to claim 4 , wherein, in the joining step, as the predetermined temperature, the tool starts to move at a time at which a temperature of the workpiece is a temperature greater than or equal to 0.45 times and less than or equal to 0.8 times of a melting point of the workpiece, and the workpiece is joined.

8 . The production method of the joint material according to claim 4 , wherein, as the tool, a bobbin tool configured to perform joining such that the workpiece is sandwiched using a first shoulder and a second shoulder from both surfaces is used, and

the production method of the joint material further comprises:

a chamfering step of forming a chamfered portion in an end edge of at least one of the first shoulder side and the second shoulder side on the end surface of the workpiece before the joining step.

9 . The end tab for friction stir welding according to claim 1 , wherein the cutout portion has

a crossing portion which extends in a width direction crossing the joining line and which opens in a surface of one side of the end tab in the width direction, and

a bent portion which continues to the crossing portion and which bends and extends from the crossing portion.

10 . The production method of the joint material according to claim 3 , wherein the cutout portion has

a crossing portion which extends in a width direction crossing the joining line and which opens in a surface of one side of the end tab in the width direction, and

a bent portion which continues to the crossing portion and which bends and extends from the crossing portion.

11 . The production method of the joint material according to claim 4 , wherein the cutout portion has

a crossing portion which extends in a width direction crossing the joining line and which opens in a surface of one side of the end tab in the width direction, and

a bent portion which continues to the crossing portion and which bends and extends from the crossing portion.