Title:
RESISTANCE SPOT WELDING JOINT AND RESISTANCE SPOT WELDING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2023/063097
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a resistance spot welding joint, and a resistance spot welding method for the same. The present invention is a resistance spot welding joint comprising a plurality of resistance-spot-welded steel sheets including at least one high-strength steel sheet, wherein: the high-strength steel sheet has a specific component composition; the structure of a nugget edge region has 1% or more ferrite in terms of an area ratio to the entire nugget edge region; a hardness Hv of a most softened portion of the nugget edge region and a hardness Hvm of a nugget central portion satisfy the relationship 0.90 × Hvm > Hv; and a hardness Hvh of a HAZ softened region and the hardness Hvm of the nugget central region satisfy the relationship 0.90 × Hvm > Hvh.
Inventors:
ENDO REIKO (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
Application Number:
PCT/JP2022/036459
Publication Date:
April 20, 2023
Filing Date:
September 29, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/16; B23K11/11; B23K11/24; C21D9/50; C22C38/00; C22C38/58
Domestic Patent References:
| WO2021200577A1 | 2021-10-07 | |||
| WO2011025015A1 | 2011-03-03 | |||
| WO2020241500A1 | 2020-12-03 |
Foreign References:
| JP2017013078A | 2017-01-19 | |||
| JP2014180698A | 2014-09-29 | |||
| JP5182855B2 | 2013-04-17 | |||
| JP5713147B2 | 2015-05-07 | |||
| JP5895430B2 | 2016-03-30 | |||
| JP6107939B2 | 2017-04-05 | |||
| JP6315161B1 | 2018-04-25 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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