Title:
RESISTANCE SPOT-WELDED JOINT AND RESISTANCE SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2023/153247
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
Inventors:
KIM JINGEUM (JP)
KAWABE NAO (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
KAWABE NAO (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
Application Number:
PCT/JP2023/002741
Publication Date:
August 17, 2023
Filing Date:
January 27, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24; C22C38/00; C22C38/14; C22C38/60
Domestic Patent References:
| WO2021162101A1 | 2021-08-19 | |||
| WO2011025015A1 | 2011-03-03 | |||
| WO2013114850A1 | 2013-08-08 | |||
| WO2012141290A1 | 2012-10-18 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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