Title:
RESISTANCE SPOT WELDING METHOD AND METHOD FOR MANUFACTURING WELDED MEMBER
Document Type and Number:
WIPO Patent Application WO/2020/004115
Kind Code:
A1
Abstract:
The method of the present invention involves performing main welding, and performing test welding prior to the main welding, wherein: in post-energization in the test welding, energization is performed by constant current control under the condition that a mean value Vtm of an inter-electrode voltage in main energization of the test welding and a mean value Vtp of the inter-electrode voltage in the post-energization satisfy the relationship 0.5≤Vtp/Vtm≤2.0 if tc<800 ms, the relationship 0.5-0.3×(tc-800)/800≤Vtp/Vtm≤2.0-0.5×(tc-800)/800 if 800 ms≤tc<1600 ms, and the relationship 0.2≤Vtp/Vtm≤1.5 if tc≥1600 ms; adaptive control welding is performed in the main energization of the main welding; and in the post-energization of the main welding, energization employing constant current control is performed under the condition that the relationship 0.8×Itp≤Imp≤1.2×Itp is satisfied, where Itp is the current value in the post-energization of the test welding, and Imp is the current value in the post-energization of the main welding.
Inventors:
SAWANISHI CHIKAUMI (JP)
MATSUDA HIROSHI (JP)
IKEDA RINSEI (JP)
MATSUDA HIROSHI (JP)
IKEDA RINSEI (JP)
Application Number:
PCT/JP2019/023965
Publication Date:
January 02, 2020
Filing Date:
June 17, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24
Domestic Patent References:
| WO2016174842A1 | 2016-11-03 | |||
| WO2017212916A1 | 2017-12-14 | |||
| WO2016147551A1 | 2016-09-22 | |||
| WO2014136507A1 | 2014-09-12 |
Foreign References:
| JP2010221284A | 2010-10-07 | |||
| JP2003236674A | 2003-08-26 | |||
| JP2006043731A | 2006-02-16 | |||
| JPH09216071A | 1997-08-19 | |||
| JPH1094883A | 1998-04-14 | |||
| JPH1133743A | 1999-02-09 |
Other References:
See also references of EP 3815832A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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