Widerstandspunktgeschweisstes Element und Widerstandspunktschweissverfahren dafür

Details

Veröffentlichungs-Nr.

EP4792967

Anmeldetag

2. Dezember 2024

Veröffentlichung

12. Juni 2025

Rechtsraum

EP

Abstract

An object is to provide a resistance spot welded member and a resistance spot welding method therefor. A resistance spot welded member of the present invention includes two or more overlapped steel sheets resistance spot welded to one another. In the resistance spot welded member, the two or more overlapped steel sheets include one or more Zn-coated steel sheets; in a pair or pairs in which two of the steel sheets are in contact with each other in a vertical direction while having a Zn coating between the steel sheets, the pair having the largest difference in tensile strength is defined as a first pair of sheets; the first pair of sheets is such that an Fe-Zn alloy layer present from a position 300 µm away from an end of a nugget in the sheet width direction to a position 700 µm away from the end of the nugget has an Fe concentration satisfying expressions (1) to (3): 98 ≥ C Fe <img class="EMIRef" id="922dd2bb-a84d-4920-ad90-713d6fc64617-ia01" /> C<Fe> ≥ {25 × Si<High> × (CE<1> - CE<2>)} + {θ + (g<Sheet>/1.2)} + [{(S<Zn> × d<GB>)<0.5>}/30] + {60 + (C<0Fe>/3)} <img class="EMIRef" id="922dd2bb-a84d-4920-ad90-713d6fc64617-ia02" /> m ≤ 0.10 <img class="EMIRef" id="922dd2bb-a84d-4920-ad90-713d6fc64617-ia03" />

Anmelder

Firma

JFE Steel Corporation

Land

🇯🇵 Japan