The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2026
Filed:
Jul. 21, 2022
Applicant:
Jfe Steel Corporation, Tokyo, JP;
Inventors:
Daiki Yamagishi, Tokyo, JP;
Katsutoshi Takashima, Tokyo, JP;
Hiroshi Matsuda, Tokyo, JP;
Ryoji Ohashi, Kobe, JP;
Yoshitaka Muramatsu, Kobe, JP;
Takuya Fukuda, Kobe, JP;
Assignee:
JFE STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K 20/00 (2006.01); B23K 20/12 (2006.01); B23K 101/18 (2006.01); B23K 101/34 (2006.01); B23K 103/04 (2006.01);
U.S. Cl.
CPC ...
B23K 20/12 (2013.01); B23K 2101/18 (2018.08); B23K 2101/34 (2018.08); B23K 2103/04 (2018.08);
Abstract
Provided is a friction stir spot welded joint having high joint strength even in the case where a high strength steel sheet, particularly a steel sheet with a tensile strength (TS) of 980 MPa or more, is used as a material to be welded. An annular groove is formed on an upper surface of an upper sheet out of overlapping steel sheets, and a shape, microstructure, and hardness of a welded portion are appropriately controlled simultaneously.