公开(公告)号：US20210229210A1

公开(公告)日：2021-07-29

申请号：US17230358

申请日：2021-04-14

Applicant: OSAKA UNIVERSITY ,  TOSHIBA MATERIALS CO., LTD.

Inventor： Hidetoshi Fujll ,  Yoshiaki Morisada ,  Kai Funakl ,  Masahiro Kato ,  Takayuki Fukasawa ,  Yutaka Abe

IPC: B23K20/12

Abstract: A friction stir welding tool member according to the present embodiment has a shoulder portion and a probe portion concentrically projecting from an upper surface of the shoulder portion. The shoulder portion includes a curved surface processed portion that is curved to have a curved shape on an outer peripheral edge of the shoulder portion. A space occupancy occupied by the two-dimensional space in which neither the shoulder portion nor the probe portion exists is in a range of 30% to 70%, the space occupancy being determined based on a projection drawing of a side surface region surrounded from a tip of the probe portion to the curved surface processed portion of the shoulder portion.