US 11,911,841 B2
Double-acting friction stir spot welding apparatus and method of operating double-acting friction stir spot welding apparatus
Masahiro Miyake, Kobe (JP); Syuhei Yoshikawa, Kobe (JP); and Yusuke Yoshida, Kobe (JP)
Assigned to KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe (JP)
Appl. No. 17/762,733
Filed by Kawasaki Jukogyo Kabushiki Kaisha, Kobe (JP)
PCT Filed Sep. 15, 2020, PCT No. PCT/JP2020/034973
§ 371(c)(1), (2) Date Mar. 23, 2022,
PCT Pub. No. WO2021/060086, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-177610 (JP), filed on Sep. 27, 2019.
Prior Publication US 2022/0339734 A1, Oct. 27, 2022
Int. Cl. B23K 20/00 (2006.01); B23K 20/12 (2006.01)
CPC B23K 20/125 (2013.01) [B23K 20/1255 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A 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,
wherein an oil solution is disposed at at least one circumferential surface out of an outer circumferential surface of the pin and an inner circumferential surface of the shoulder.