Title:
RESISTANCE SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2024/014146
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a resistance spot welding method. The present invention provides a resistance spot welding method for joining two or more steel sheets including at least one zinc-plated steel sheet, the method comprising: a first current application step in which a nugget that has a nugget diameter of 3.0√t mm to 4.5√t mm is formed; and a second current application step that is a multiple-stage step having n stages, each of which is composed of a cooling step for maintaining a current non-application state for not less than 10 ms but less than 160 ms and a current application step for applying a current for not less than 20 ms but less than 200 ms. In addition, the current value of the current application step in each stage of the multiple-stage step satisfies formula (1) and formula (2); and the current value I1 in the first stage is not less than the current value in the first current application step. (1): I1 ≤ I2 ≤ … ≤ In
(2): I1 < In
Inventors:
KAWABE NAO (JP)
SAWANISHI CHIKAUMI (JP)
TANIGUCHI KOICHI (JP)
TAKASHIMA KATSUTOSHI (JP)
SAWANISHI CHIKAUMI (JP)
TANIGUCHI KOICHI (JP)
TAKASHIMA KATSUTOSHI (JP)
Application Number:
PCT/JP2023/019968
Publication Date:
January 18, 2024
Filing Date:
May 29, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/24; B23K11/16
Domestic Patent References:
| WO2019124464A1 | 2019-06-27 |
Foreign References:
| JP2010207909A | 2010-09-24 | |||
| JP2017047475A | 2017-03-09 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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