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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 12663032 B1

PDFFull Text
Date of Patent:
Jun. 23, 2026

Filed:

Dec. 24, 2021

Welded joint and automobile member

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Takuya Mitsunobu, Tokyo, JP;

Hiroshi Takebayashi, Tokyo, JP;

Takehiro Takahashi, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
F16B 5/08 (2006.01); B23K 11/11 (2006.01); B23K 11/16 (2006.01); B32B 15/01 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); B62D 27/02 (2006.01); C21D 1/26 (2006.01); C21D 1/76 (2006.01); C21D 1/84 (2006.01); C21D 8/02 (2026.01); C21D 8/0221 (2026.01); C21D 8/0247 (2026.01); C21D 8/0278 (2026.01); C21D 9/46 (2006.01); C22C 18/00 (2006.01); C22C 18/04 (2006.01); C22C 21/06 (2006.01); C22C 21/10 (2006.01); C22C 23/02 (2006.01); C22C 23/04 (2006.01); C22C 30/00 (2006.01); C22C 38/60 (2006.01); C23C 2/06 (2006.01); C23C 28/02 (2006.01); C23C 30/00 (2006.01); B23K 101/00 (2006.01); B23K 101/34 (2006.01); B23K 103/04 (2006.01);
U.S. Cl.
CPC ...
F16B 5/08 (2013.01); B23K 11/11 (2013.01); B23K 11/115 (2013.01); B23K 11/16 (2013.01); B23K 11/163 (2013.01); B32B 15/011 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); B62D 27/023 (2013.01); C21D 1/26 (2013.01); C21D 1/76 (2013.01); C21D 1/84 (2013.01); C21D 8/02 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0252 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C21D 8/0278 (2013.01); C21D 9/46 (2013.01); C22C 18/00 (2013.01); C22C 18/04 (2013.01); C22C 21/06 (2013.01); C22C 21/10 (2013.01); C22C 23/02 (2013.01); C22C 23/04 (2013.01); C22C 30/00 (2013.01); C22C 38/60 (2013.01); C23C 2/06 (2013.01); C23C 28/025 (2013.01); C23C 30/005 (2013.01); B23K 2101/006 (2018.08); B23K 2101/34 (2018.08); B23K 2103/04 (2018.08); B32B 2250/02 (2013.01); B32B 2311/30 (2013.01); B32B 2605/08 (2013.01); C23C 30/00 (2013.01); Y10T 428/1259 (2015.01); Y10T 428/12611 (2015.01); Y10T 428/12618 (2015.01); Y10T 428/1266 (2015.01); Y10T 428/12729 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12965 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/2495 (2015.01); Y10T 428/24967 (2015.01); Y10T 428/24975 (2015.01); Y10T 428/26 (2015.01); Y10T 428/263 (2015.01); Y10T 428/264 (2015.01); Y10T 428/265 (2015.01);
Abstract

A welded joint comprising a first steel sheet and a second steel sheet. A first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, no plating layer is present on or a second plating layer is provided on a surface of the second steel sheet facing the first steel sheet, and a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end part of the corona bond toward an outside of the spot welded part. A higher tensile strength of a tensile strength of the first steel sheet and a tensile strength of the second steel sheet is 780 MPa or more, and an area ratio of a MgZnphase at the cross-section of the boundary plating layer is 10% or more.

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