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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 11992892 B1

PDFFull Text
Date of Patent:
May. 28, 2024

Filed:

Feb. 05, 2019

Resistance spot welding method and method for producing resistance spot welded joint

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Reiko Endo, Tokyo, JP;

Muneo Matsushita, Tokyo, JP;

Koichi Taniguchi, Tokyo, JP;

Hiroshi Matsuda, Tokyo, JP;

Rinsei Ikeda, Tokyo, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

Buchanan, Ingersoll & Rooney PC

Primary Examiner:

Adil A Siddiqui

Int. Cl.
CPC ...
B23K 11/11 (2006.01); B23K 11/16 (2006.01); B23K 11/24 (2006.01); B23K 101/00 (2006.01); B23K 101/18 (2006.01); B23K 103/04 (2006.01); C21D 6/00 (2006.01); C21D 9/50 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
B23K 11/115 (2013.01); B23K 11/16 (2013.01); B23K 11/24 (2013.01); C21D 6/004 (2013.01); C21D 9/50 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); B23K 2101/006 (2018.08); B23K 2101/18 (2018.08); B23K 2103/04 (2018.08);
Abstract

The present invention provides a resistance spot welding method. A resistance spot welding method according to the present invention in which a sheet combination of two or more overlapping steel sheets is sandwiched between a pair of electrodes and joined together by applying current while applying pressure, the method including a main current application step in which current application is performed with a current I(kA), and subsequently, a post-tempering heat treatment step in which after cooling is performed for a cooling time t(ms) shown in formula (1) below, current application is performed with a current I(kA) shown in formula (2) below for a current application time t(ms) shown in formula (3) below: 800≤t. . . formula (1), 0.5×I≤I≤I. . . formula (2), and 500≤t. . . formula (3).

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