Title:
WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2023/132241
Kind Code:
A1
Abstract:
Provided is a welded joint characterized by comprising a plurality of stacked steel sheets, nuggets joining the plurality of steel sheets, and a spot welded section having pressure welded sections and heat affected sections formed around the nuggets, wherein: at least one of the plurality of steel sheets is a plated steel sheet provided with a base material steel sheet and a plating layer formed at least on a surface of the base material steel sheet corresponding to the outermost surface of the plurality of steel sheets; the plating layer in the outermost region of the heat affected sections has a prescribed chemical composition; the ratio "Al concentration in the center of the plating layer"/"Al concentration in a plating layer position where the Fe concentration is 50% of the base material steel sheet" is 0.10-1.50 when the plating layer is measured using GDS; and the surface ratio of the β-CuZn phase is 50% or less in the plating layer of a welded shoulder section of the outermost surface of the plurality of steel sheets.
Inventors:
KAWANAMI HIROKI (JP)
MITSUNOBU TAKUYA (JP)
TAKEBAYASHI HIROSHI (JP)
TAKAHASHI TAKEHIRO (JP)
MITSUNOBU TAKUYA (JP)
TAKEBAYASHI HIROSHI (JP)
TAKAHASHI TAKEHIRO (JP)
Application Number:
PCT/JP2022/047117
Publication Date:
July 13, 2023
Filing Date:
December 21, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C2/06; B23K11/11; B23K11/16; C21D8/02; C21D9/46; C22C9/04; C22C18/00; C22C18/02; C22C18/04; C22C38/00; C22C38/60; C23C2/26
Foreign References:
| JP2020503442A | 2020-01-30 | |||
| JP2018178137A | 2018-11-15 | |||
| JP2001247951A | 2001-09-14 | |||
| JPH0261046A | 1990-03-01 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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