The welding process of a superposition part, the manufacturing method of a heavy welding member, a heavy welding member, and the parts for cars - Nippon Steel & Sumitomo Metal Corporation

Title:

The welding process of a superposition part, the manufacturing method of a heavy welding member, a heavy welding member, and the parts for cars

Document Type and Number:

Japanese Patent JP5934362

Kind Code:

B2

Abstract:

A method of welding an overlapped portion according to the present invention in which a plurality of steel sheet members are joined at an overlapped portion, and at least one of the plurality of steel sheet members contains martensite, includes: forming a spot-welded portion having a nugget in the overlapped potion; and emitting a laser beam to form a melted and solidified portion crossing an end of the nugget and located between the nugget and a position externally spaced apart from an end of the nugget by not less than 3 mm, this melted and solidified portion being formed in the steel sheet member containing the martensite so as to have a depth of not less than 50% of the thickness of the steel sheet member containing the martensite at a position externally spaced apart from the end of the nugget by 1 mm.

Inventors:

Hiroki Fujimoto
Tohru Okada
Masanori Taiyama

Application Number:

JP2014529565A

Publication Date:

June 15, 2016

Filing Date:

August 08, 2013

Export Citation:

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