Document Type and Number:
Japanese Patent JPWO2023153247
Kind Code:
A1
Abstract:
Provided are a resistance spot-welded joint and a resistance spot welding method. The present invention is a resistance spot-welded joint in which two or more steel sheets, including at least one high-strength steel sheet, are welded together, wherein: the high-strength steel sheet has a specific component composition; in a welded portion, the nugget diameter and the width of a softened section within a heat-affected section satisfy the relationship in formula (2), and the hardness X of the most-softened section within the heat-affected section and the hardness of a parent material in the high-strength steel sheet satisfy the relationship in formula (3); and the total average numeric density of NbC, TiC, and VC having a grain diameter of 100 nm or less within the heat-affected section is 80/μm2 or greater. Formula (2): (width of softened section within heat-affected section (mm)) > (nugget diameter (mm)) × 0.2; Formula (3): (X (HV)) < (hardness of parent material in high-strength steel sheet (HV)) × 0.95
Application Number:
JP2023522833A
Publication Date:
August 17, 2023
Filing Date:
January 27, 2023
Export Citation:
