Title:
WELDING JOINT AND AUTOMOBILE COMPONENT
Document Type and Number:
WIPO Patent Application WO/2022/149507
Kind Code:
A1
Abstract:
The technology of the present disclosure suppresses cracking from liquid metal embrittlement (LME) at a welding joint where a first steel sheet and a second steel sheet have been spot welded, and improves corrosion resistance. In the welding joint, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, a plating layer is not present on a surface of the second steel sheet facing the first steel sheet or a second plating layer is provided thereon, and a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end of a corona bond to outside of a spot welding section. The higher tensile strength among the tensile strength of the first steel sheet and the tensile strength of the second steel sheet is at least 780 MPa, the area ratio of a MgZn2 phase in a cross section of the boundary plating layer is at least 10%, and the first plating layer and the second plating layer satisfy a predetermined relationship I.
Inventors:
MITSUNOBU TAKUYA (JP)
TAKEBAYASHI HIROSHI (JP)
TAKAHASHI TAKEHIRO (JP)
TAKEBAYASHI HIROSHI (JP)
TAKAHASHI TAKEHIRO (JP)
Application Number:
PCT/JP2021/048404
Publication Date:
July 14, 2022
Filing Date:
December 24, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C2/06; B23K11/16; C21D9/46; C22C18/00; C22C18/04; C22C21/00; C22C21/06; C22C21/10; C22C23/00; C22C23/02; C22C23/04; C22C38/00; C22C38/60
Domestic Patent References:
| WO2019116531A1 | 2019-06-20 | |||
| WO2020213686A1 | 2020-10-22 |
Foreign References:
| JP2008038168A | 2008-02-21 | |||
| JP2020179413A | 2020-11-05 | |||
| JP2017047045A | 2017-03-09 | |||
| JP2005103608A | 2005-04-21 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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