Title:
WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2024/053665
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a welded joint inhibited from having undergone LME cracking during the production. This welded joint is characterized in that: the welded joint is configured of plated steel plates having given chemical components; in the non-heat-affected portion of each plated steel plate, the depths at which the concentration of C as determined by GDS is 0.05% or less are 5 μm or greater from the interface as a starting point between the plating layer and the base steel plate along the base depth direction; in a cross-section of the non-heat-affected portion of the steel plate, the interface between the plating layer and the base steel plate has a roughness of 3.0 μm or less in terms of Ra; and in the range of 0-100 μm from each edge of the bead of the weld in the direction opposite from the weld, the concentration of C in the base steel plate at a depth of 5 μm from the interface as a starting point between the plating layer and the base steel plate is 0.05% or less.
Inventors:
MITSUNOBU TAKUYA (JP)
YOKOYAMA TAKAFUMI (JP)
TAKEBAYASHI HIROSHI (JP)
YOKOYAMA TAKAFUMI (JP)
TAKEBAYASHI HIROSHI (JP)
Application Number:
PCT/JP2023/032486
Publication Date:
March 14, 2024
Filing Date:
September 06, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D3/04; B23K9/23; C21D9/46; C22C18/00; C22C18/04; C22C38/00; C22C38/58; C23C2/06
Domestic Patent References:
| WO2022149511A1 | 2022-07-14 | |||
| WO2022149507A1 | 2022-07-14 | |||
| WO2022149505A1 | 2022-07-14 | |||
| WO2022097738A1 | 2022-05-12 | |||
| WO2020130631A1 | 2020-06-25 |
Foreign References:
| KR20220019867A | 2022-02-18 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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