Title:
RESISTANCE SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/123350
Kind Code:
A1
Abstract:
Provided is a resistance spot welding method whereby expulsion during welding or a reduction in sheet thickness at a weld can be suppressed and delayed fracture of a welded joint can be suppressed. A resistance spot welding method for overlapping two or more steel sheets on each other and electrifying the steel sheets while sandwiching and pressing the steel sheets in a pair of welding electrodes to form a nugget and join the steel sheets, wherein the resistance spot welding method has a main electrification step for forming a nugget part by electrifying the steel sheets with a first electric current I1 while pressing the steel sheets with a first pressing force F1 (kN), and a later electrification step for electrifying for an electrification time ta (ms) represented by formula (2) with a second electric current I2 (kA) represented by formula (1) subsequent to the main electrification step and cooling the nugget part, the later electrification step having a first pressing step for maintaining the first pressing force F1 for a pressing delay time tb (ms) represented by formula (3) from the start of the later electrification step, and a second pressing step for pressing with a second pressing force F2 (kN) represented by formula (4) subsequent to the first pressing step.
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Inventors:
KAWABE NAO (JP)
MATSUDA HIROSHI (JP)
OKITA YASUAKI (JP)
IKEDA RINSEI (JP)
MATSUDA HIROSHI (JP)
OKITA YASUAKI (JP)
IKEDA RINSEI (JP)
Application Number:
PCT/JP2017/041734
Publication Date:
July 05, 2018
Filing Date:
November 21, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24
Foreign References:
| JP2015093282A | 2015-05-18 | |||
| JP2013193095A | 2013-09-30 | |||
| JP2010240740A | 2010-10-28 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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