RESISTANCE SPOT WELDING MEMBER AND RESISTANCE SPOT WELDING METHOD THEREFOR

WIPO Patent Application WO/2022/249651

A1

The purpose of the present invention is to provide a resistance spot welding member and a resistance spot welding method therefor. The present invention is a resistance spot welding member comprising a resistance spot welding part in which a plurality of steel sheets including at least one high-strength plated steel sheet are resistance-spot-welded, wherein: the high-strength plated steel sheet has a specific component composition; an Fe-based electroplated layer serving as an underlying layer is provided between a plated layer of the high-strength plated steel sheet and a base material; the solid solution Si amount and the solid solution Mn amount in a region on a steel sheet surface in the vicinity of a corona bond end of the resistance spot welding part are respectively at most 35% of the solid solution Si amount and at most 35% of the solid solution Mn amount at a position corresponding to 1/4 of the sheet thickness; and regarding the steel sheet structure in the vicinity of the corona bond end, the average number density of cementite having a particle diameter of at least 0.06 μm is at least 0.08 pieces/μm2.

TAKASHIMA KATSUTOSHI (JP)
YAMAMOTO SHUNSUKE (JP)
HOSHINO KATSUYA (JP)
MATSUDA HIROSHI (JP)

PCT/JP2022/011158

December 01, 2022

March 14, 2022

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JFE STEEL CORP (JP)

B23K11/16; B23K11/11; C21D9/46; C22C38/00; C22C38/06; C22C38/60; C23C2/02; C23C2/06; C23C28/02

JP2021500474A	2021-01-07
JP2021500473A	2021-01-07
JP2008254053A	2008-10-23
JP6194765B2	2017-09-13
JPH0258443B2	1990-12-07

"X-ray Diffraction Handbook", 2000, RIGAKU CORPORATION, pages: 26,62 - 64

KUMASAKA Akira et al. (JP)

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