Title:
METHOD FOR MANUFACTURING SPOT WELDED JOINT, AND SPOT WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2024/029626
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a spot welded joint, comprising: a regular welding step in which a regular welding current value Iw0 (kA) is supplied, so as to satisfy a predetermined condition, to a plate assembly comprising high-strength steel plates having a Ceq of at least 0.36% by mass, and a molten portion is formed thereby; a first subsequent power supply step in which a first subsequent power supply current value Iw1 is supplied for a time tw1 (ms) following a time tc1 during which power is not supplied; and a second subsequent power supply step in which, after the first subsequent power supply step, a current value Iw2 is supplied for a time tw2 following a time tc2 during which power is not supplied. The steps from the regular welding step to the final subsequent power supply step are carried out continuously in a state in which a pressurizing force FE is maintained. Further provided is a spot welded joint in which the number ratio of crystal grains having an aspect ratio of 7 or more is 50% or less in an intermediate portion in the longer-axis direction of a nugget.
Inventors:
YOSHINAGA CHISATO (JP)
Application Number:
PCT/JP2023/028603
Publication Date:
February 08, 2024
Filing Date:
August 04, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B23K11/11; B23K11/16; B23K11/24; C22C38/58
Domestic Patent References:
| WO2017010071A1 | 2017-01-19 |
Foreign References:
| JP2013086125A | 2013-05-13 | |||
| JP2016068142A | 2016-05-09 | |||
| JP2013128945A | 2013-07-04 |
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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