Title:
METHOD FOR MANUFACTURING RESISTANCE SPOT WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2019/124464
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a resistance 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, the resistance spot welding is performed through two-step conduction comprising: a preliminary conduction step using an electrode pressing force of not less than 3.9 kN at a current Ia(t) (kA) for a time period ta (sec); and a main conduction step. All the currents for the preliminary conduction and the main conduction are direct currents, not less than 80% of the preliminary conduction time period is set to continuous conduction, Ia(t) and ta (sec) satisfy Ia(t) ≤ 6.0 (kA) and formula (AA), and the main conduction is set to pulsation conduction.
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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/JP2018/046874
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:
B23K11/24; B23K11/16
Domestic Patent References:
| WO2015170687A1 | 2015-11-12 |
Foreign References:
| JP2010247215A | 2010-11-04 | |||
| JP2010207909A | 2010-09-24 | |||
| JP2016068142A | 2016-05-09 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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