Title:
METHOD FOR MANUFACTURING RESISTANCE SPOT WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2019/124465
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a spot welded joint in which generation of expulsion can be suppressed when spot welding is performed on a steel sheet including at least one hot stamping steel sheet. In the method, when two or more steel sheets are overlaid with each other and resistance spot welding is performed on the resultant overlaid part, an electrode in which the leading end part thereof has a projecting curved surface and the curvature radius of the curved surface is not more than 30 mm is used and the resistance spot welding is performed through two-step conduction comprising a preliminary conduction at a current Ia(t) (kA) for a time period ta (sec) and a main conduction. The currents for the preliminary conduction and the main conduction are direct currents, and Ia(t) and ta (sec) satisfy Ia(t) ≤ 6.0 (kA) and formula (AA).
Inventors:
FURUSAKO SEIJI (JP)
YASUYAMA MASANORI (JP)
MIURA TOMONOBU (JP)
YANAGAWA TOMONORI (JP)
YASUYAMA MASANORI (JP)
MIURA TOMONOBU (JP)
YANAGAWA TOMONORI (JP)
Application Number:
PCT/JP2018/046881
Publication Date:
June 27, 2019
Filing Date:
December 19, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
TOYOTA TEKKO KK (JP)
TOYOTA TEKKO KK (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24; B23K11/30
Domestic Patent References:
| WO2016088319A1 | 2016-06-09 | |||
| WO2015170687A1 | 2015-11-12 |
Foreign References:
| JP2013063470A | 2013-04-11 | |||
| JP2010207909A | 2010-09-24 | |||
| JP2008161878A | 2008-07-17 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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