Title:
WELDED JOINT, METHOD FOR PRODUCING WELDED JOINT, AUTOMOTIVE COMPONENT, AND BUILDING MATERIAL COMPONENT
Document Type and Number:
WIPO Patent Application WO/2024/009904
Kind Code:
A1
Abstract:
The welded joint according to an embodiment of the present invention comprises: a first steel plate; a second steel plate; a weld bead with which an end of the first steel plate is bonded to a first surface of the second steel plate; an HAZ; a coating film disposed on the surfaces of the welded joint; and a scale lying between the HAZ and the coating film so as to be in contact with the HAZ on the second-surface side of the second steel plate that is opposite from the first surface. The second steel plate has a chemical composition satisfying Ti+1.2×Al-1.2×C-7×P>0. The weld bead has a penetration depth of 50-90% with respect to the thickness of the second steel plate. The scale contains, in terms of atm.%, 2.00-60.00% Ti and 2.00-30.00% Al. In the region overlying the HAZ on the second-surface side of the second steel plate, the areal proportion of the coating film which peels off in a coating-film peel test is 15% or less.
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Inventors:
MATSUBA MASAHIRO (JP)
ISHIDA YOSHINARI (JP)
KODAMA SHINJI (JP)
ISHIDA YOSHINARI (JP)
KODAMA SHINJI (JP)
Application Number:
PCT/JP2023/024404
Publication Date:
January 11, 2024
Filing Date:
June 30, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B23K9/02; B23K9/00; B23K9/23; C22C38/00; C22C38/14; C22C38/60
Domestic Patent References:
| WO2020196869A1 | 2020-10-01 |
Foreign References:
| JP2011173124A | 2011-09-08 | |||
| JP2021178354A | 2021-11-18 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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