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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.:

US 12208462 B1

PDFFull Text
Date of Patent:
Jan. 28, 2025

Filed:

May. 13, 2021

Steel sheet assembly, method of manufacturing steel sheet assembly, and spot welding process

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Hiroshi Matsuda, Tokyo, JP;

Yasuaki Okita, Tokyo, JP;

Muneo Matsushita, Tokyo, JP;

Rinsei Ikeda, Tokyo, JP;

Kenji Oi, Tokyo, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

DLA Piper LLP (US)

Primary Examiner:

Helena Kosanovic

Assistant Examiner:

Keith Brian Assante

Int. Cl.
CPC ...
B23K 11/16 (2006.01); B23K 1/20 (2006.01); B23K 11/11 (2006.01); B23K 11/30 (2006.01); B23K 11/34 (2006.01); B23K 35/00 (2006.01); B23K 35/02 (2006.01); B23K 103/04 (2006.01); B32B 15/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/18 (2006.01); C22C 38/60 (2006.01); H05B 3/03 (2006.01);
U.S. Cl.
CPC ...
B23K 11/163 (2013.01); B23K 1/20 (2013.01); B23K 11/11 (2013.01); B23K 11/16 (2013.01); B23K 11/30 (2013.01); B23K 11/34 (2013.01); B23K 35/004 (2013.01); B32B 15/04 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/60 (2013.01); H05B 3/03 (2013.01); B23K 35/0205 (2013.01); B23K 2103/04 (2018.08); C22C 38/12 (2013.01);
Abstract

A welding process used in a method of manufacturing a steel sheet assembly includes spot welding steel sheets performed for a heat time of 0.08 seconds or more using a convex electrode with a tip radius of curvature of 20 mm or more or a flat electrode such that the weld force F (kN) for initial 0.03 seconds of the heat time satisfies formula: F<0.00125×(1+0.75×t)+3 where TS (MPa) denotes an average strength of the steel sheets and represents a weighted mean value of a thickness of each of the steel sheets, and t(mm) denotes a total thickness of the steel sheets (the sum of the thicknesses of the steel sheets).

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