Patent ID: 11911841
Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 5:
6. A method of operating a double-acting friction stir spot welding apparatus, the double-acting friction stir spot welding apparatus comprising:
a pin formed in a cylindrical shape;
a shoulder formed in a hollow cylindrical shape and into which the pin is inserted;
a clamp formed in a hollow cylindrical shape and into which the shoulder is inserted;
a rotary drive that rotates the pin and the shoulder on an axis coaxial with the pin; and
a linear drive that reciprocates each of the pin and the shoulder along the axis, the method comprising:
(A) supplying an oil solution to at least one circumferential surface out of an outer circumferential surface of the pin and an inner circumferential surface of the shoulder.