Title:
WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2024/053669
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a welded joint in which LME cracking during manufacturing is suppressed. A welded joint according to the present invention is characterized in that: a plated steel sheet forming the welded joint has a prescribed chemical composition; when the C-concentration is measured by GDS in a thermally non-affected portion of the welded joint in the depth direction of a base steel sheet starting from the interface between the base steel sheet and a plating layer of the plated steel sheet, the depth at which the C-concentration is 0.05% or less is 10 μm or more; the roughness expressed as Ra of the interface between the base steel sheet and the plating layer of the plated steel sheet in the thermally non-affected portion is 3.0 μm or less; and, at a position 500 μm apart from an end of a pressure welded portion of the welded joint, the thickness of a layer where the area percentage of a ferrite phase is 90% or more is at least 15 μm in the depth direction of the base steel sheet starting from the interface between the base steel sheet and the plating layer of the plated steel sheet.
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Inventors:
MITSUNOBU TAKUYA (JP)
YOKOYAMA TAKAFUMI (JP)
TAKEBAYASHI HIROSHI (JP)
YOKOYAMA TAKAFUMI (JP)
TAKEBAYASHI HIROSHI (JP)
Application Number:
PCT/JP2023/032519
Publication Date:
March 14, 2024
Filing Date:
September 06, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D3/04; B23K11/11; B23K11/16; 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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