Title:
RESISTANCE SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/219968
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a resistance spot welding method. The present invention relates to a resistance spot welding method for joining two or more steel sheets including at least one galvanized steel sheet. Electrification involves a first electrification step and a second electrification step. In the first electrification step, a nugget having a nugget diameter of 3√t to 4.5√t is formed by setting a current value I1 (kA) and an electrification time, where t is the thickness of the thinnest steel sheet among the stacked steel sheets. In the second electrification step, the nugget is expanded by repeating a cooling step for maintaining a non-electrified state for 10 ms to 160 ms (exclusive of 160) and an electrification step for electrifying for 20 ms to 200 ms (exclusive of 200) at a current value I2 (kA) equal to or greater than the current value I1 (kA).
Inventors:
KAWABE NAO (JP)
SAWANISHI CHIKAUMI (JP)
TAKASHIMA KATSUTOSHI (JP)
TANIGUCHI KOICHI (JP)
MATSUDA HIROSHI (JP)
YAMAGISHI DAIKI (JP)
SAWANISHI CHIKAUMI (JP)
TAKASHIMA KATSUTOSHI (JP)
TANIGUCHI KOICHI (JP)
MATSUDA HIROSHI (JP)
YAMAGISHI DAIKI (JP)
Application Number:
PCT/JP2022/009682
Publication Date:
October 20, 2022
Filing Date:
March 07, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/24
Domestic Patent References:
| WO2019124464A1 | 2019-06-27 | |||
| WO2020045678A1 | 2020-03-05 |
Foreign References:
| JP2010247215A | 2010-11-04 | |||
| JP2019072764A | 2019-05-16 | |||
| JP2010207909A | 2010-09-24 | |||
| JP2003103377A | 2003-04-08 | |||
| JP2003236676A | 2003-08-26 | |||
| JP2017047476A | 2017-03-09 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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