US 12,240,199 B2
Welded member
Misaki Asada, Tokyo (JP); Hiroki Fujimoto, Tokyo (JP); and Takehiro Takahashi, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/702,221
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Nov. 11, 2022, PCT No. PCT/JP2022/042145
§ 371(c)(1), (2) Date Apr. 17, 2024,
PCT Pub. No. WO2023/085410, PCT Pub. Date May 19, 2023.
Claims priority of application No. 2021-184683 (JP), filed on Nov. 12, 2021.
Prior Publication US 2024/0326381 A1, Oct. 3, 2024
Int. Cl. B23K 9/23 (2006.01); B32B 15/01 (2006.01); B23K 26/00 (2014.01); B23K 103/04 (2006.01); B23K 103/08 (2006.01); C25D 3/12 (2006.01)
CPC B32B 15/015 (2013.01) [B23K 9/23 (2013.01); B23K 26/0006 (2013.01); B23K 2103/04 (2018.08); B23K 2103/08 (2018.08); C25D 3/12 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A welded member made by connecting a nickel (Ni) plated steel sheet and another steel sheet via a welded part, wherein:
the Ni plated steel sheet has a steel sheet which is a base sheet, a Ni plating layer located on the steel sheet, and an iron and nickel (Fe—Ni) diffusion alloy layer located between the steel sheet and the Ni plating layer;
a Ni concentration is 70 mass % or more and a Fe concentration is 30 mass % or less in a surface layer of each of (a) a toe, (b) a toe near area which is an area of the Ni plated steel sheet at a distance from the toe in a direction away from the welded part of 10 μm or more and 1 mm or less, and (c) the welded part;
wherein the toe corresponds to a portion where a surface of the Ni plating layer in the Ni plated steel sheet intersects with the surface of the welded part; and
when a portion which has not been subjected to welding in the Ni plated steel sheet is regarded as a non-welded part,
a thickness of the Fe—Ni diffusion alloy layer is 0.5 to 1.5 μm and a total thickness of the Ni plating layer and the Fe—Ni diffusion alloy layer is 2.7 to 14.0 μm at the non-welded part, and
a total concentration of sulfur (S) and carbon (C) in the Ni plating layer at the non-welded part is less than 20 ppm.