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Title:
RESISTANCE SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/159764
Kind Code:
A1
Abstract:
Provided is a resistance spot welding method that makes it possible to curb the occurrence of cracks in welded parts according to the contact angle, regardless of the type of steel, and to ensure sufficient joint strength. A resistance spot welding method in which a plate set obtained by stacking a plurality of steel plates together is sandwiched between a pair of electrodes and joined together by being energized while pressure is being applied, wherein at least one of the plurality of steel plates stacked together is a surface-treated steel plate having a metal plating layer on the surface, and the method comprises, as energization, a main energization step for performing energizing for forming a nugget section, a no-energization step for pausing energization over an energization pause time Tc (cycle) after the main energization step, and a later energization step for performing energization for re-heating without growing a nugget section after the no-energization step, the energization satisfying the relationships of formula (I), where A (degrees) is the contact angle of the electrodes, Im (kA) is a current value of the main energization step, Ip (kA) is a current value of the later energization step, a variable B is 1+0.1·Tc, and a variable C is 1+0.2·Tc. Formula (I): when 0

Inventors:
TANIGUCHI KOICHI (JP)
SAWANISHI CHIKAUMI (JP)
TAKASHIMA KATSUTOSHI (JP)
MATSUDA HIROSHI (JP)
IKEDA RINSEI (JP)
Application Number:
PCT/JP2018/007809
Publication Date:
September 07, 2018
Filing Date:
March 01, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24
Domestic Patent References:
WO2016181996A12016-11-17
Foreign References:
JP2016068142A2016-05-09
JPH10195597A1998-07-28
JP2003103377A2003-04-08
JP2003236676A2003-08-26
JP2010115706A2010-05-27
Other References:
See also references of EP 3590645A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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