logo

For the Inventor, By the Inventor

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 12337405 B1

PDFFull Text
Date of Patent:
Jun. 24, 2025

Filed:

Nov. 28, 2019

Resistance spot welded joint comprising a zinc coated ahss steel sheet

Applicant:

Voestalpine Stahl Gmbh, Linz, AT;

Inventors:

Florian Winkelhofer, Kirchberg-Thening, AT;

Thomas Hebesberger, Pasching, AT;

Martin Gruber, Pregarten, AT;

Assignee:

VOESTALPINE STAHL GMBH, Linz, AT;

Attorney:

KARCESKI IP LAW, PLLC

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
B23K 11/16 (2006.01); B23K 11/11 (2006.01); B23K 11/20 (2006.01); B32B 15/01 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C23C 2/06 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01);
U.S. Cl.
CPC ...
B23K 11/20 (2013.01); B23K 11/11 (2013.01); B23K 11/16 (2013.01); B32B 15/011 (2013.01); C21D 1/26 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C23C 2/06 (2013.01); C21D 2211/00 (2013.01); C21D 2211/005 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01);
Abstract

A resistance spot welded joint of at least two steel sheets and a method of producing a resistance spot welded joint of at least two steel sheets, wherein at least one of the steel sheets is provided with a Zn containing layer, the steel sheet has a tensile strength of at least 980 MPa, a multiphase microstructure comprising bainite, bainitic ferrite and tempered martensite in a total amount of at least of 75 volume % and retained austenite in an amount of 3-20 volume % and wherein the steel sheet provided with the Zn containing layer has a composition consisting of (in wt. %): C 0.1-0.3; Si 0.2-3.0; Mn 1.0-3.0; Cr≤2.0; Mo≤0.5; Al≤2.0; Nb≤0.2; V≤0.2; Ti 0.01-0.15; B 0.0005-0.01; and balance Fe apart from impurities, wherein the heat affected zone in the spot welded joint is free from cracks having a length of more than 500 μm.

Find Patent Forward Citations

Loading…