PROJECTION-WELDED JOINT AND PRODUCTION METHOD FOR PROJECTION-WELDED JOINT

WIPO Patent Application WO/2023/234390

A1

A projection-welded joint according to one embodiment of the present disclosure comprises a steel sheet, a steel member, and a projection welding unit for joining the steel sheet and the steel member. The projection welding unit comprises: a melt solidification part; and a corona bond part located around the melt solidification part. The amount of carbon at the sheet thickness center of the steel sheet is 0.25 mass% or more, and the hardness at an outer edge of the corona bond part is lower than that at a position that is 1/4 of the sheet thickness of the steel sheet on the outer side of the corona bond part. Preferably, the steel sheet has a softened layer within a range of 20 μm depth from the surface on the side to which the steel member is joined. The hardness of the the softened layer is 95% or less of the hardness at the position that is 1/4 of the sheet thickness of the steel sheet.

JP3142620	Electrodes for spot welders
JPH11509482	[Title of the Invention] A method for manufacturing a lightweight strip or a lightweight plate.
JP2003103376	JOINING CONSTRUCTION AND JOINING METHOD FOR STEEL MATERIAL

OKADA TOHRU (JP)
FUJIMOTO HIROKI (JP)
FURUSAKO SEIJI (JP)

PCT/JP2023/020485

December 07, 2023

June 01, 2023

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NIPPON STEEL CORP (JP)

B23K11/14; B23K11/00; C22C38/00; C22C38/04

JP2013078784A	2013-05-02
JP2001009573A	2001-01-16
JP2012082890A	2012-04-26
JP7020597B1	2022-02-16

MATSUNUMA Yasushi et al. (JP)

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