Title:
RESISTANCE SPOT WELDING JOINT AND RESISTANCE SPOT WELDING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/021922
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a resistance spot welding joint and a resistance spot welding method therefor. The present invention is a resistance spot welding joint by which two or more steel plates, including at least one high-strength steel plate, are resistance spot welded. The high-strength steel plate comprises a component composition containing, in mass%, C at 0.05-0.6%, Si at 0.1-2.0%, Mn at 1.5-4.0%, and P at 0.10% or less, with the remainder containing Fe and unavoidable impurities. The hardness of the softest region of a nugget is 90% or less with respect to the hardness of a heat-affected section thereof. Moreover, the organization of the softest region of the nugget is tempered martensite. Furthermore, the average number density of carbides with a particle diameter of 100 nm or more in the softest region of the nugget is 10 or more per 5 μm2 plate cross-section.
Inventors:
ENDO REIKO (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
Application Number:
PCT/JP2022/028412
Publication Date:
February 23, 2023
Filing Date:
July 21, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24; C22C38/00; C22C38/04; C22C38/58
Domestic Patent References:
| WO2020240961A1 | 2020-12-03 | |||
| WO2018038045A1 | 2018-03-01 |
Foreign References:
| JP2013128945A | 2013-07-04 | |||
| JP2020069525A | 2020-05-07 | |||
| JP2020082104A | 2020-06-04 | |||
| JP5043236B2 | 2012-10-10 | |||
| JP5182855B2 | 2013-04-17 | |||
| JP5895430B2 | 2016-03-30 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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