Welded member of galvanized steel sheets

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12221701
APP PUB NO 20240240299A1
SERIAL NO

18622583

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A welded member includes: a first steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet; and a second steel sheet spot-welded on the first steel sheet and facing the zinc-based plating layer of the first steel sheet, a spot-welded zone being formed between the first steel sheet and the second steel sheet. A surface layer of the base steel sheet has a decarburization ratio of 30% or more. The decarburization ratio is represented by equation: Decarburization ratio (%) of surface layer=(1−average carbon concentration in surface layer/bulk carbon concentration)*100 where the surface layer refers to a region of the base steel sheet from the surface thereof to a depth of 35 μm. A shoulder portion of the spot-welded zone includes a B-type crack having a length of 100 μm or less, and no C-type crack.

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Patent Owner(s)

  • POSCO CO., LTD.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jee, Chang-Woon Gwangyang-si, KR 8 30
Jeong, Yeon-Chae Gwangyang-si, KR 2 0
Kang, Ki-Cheol Gwangyang-si, KR 24 34
Min, Kwang-Tai Gwangyang-si, KR 9 0
Uhm, Sang-Ho Incheon, KR 9 8

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