Method of resistance spot welding
US10933488B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2016 |
| Grant date | Mar 2, 2021 |
| Priority date | — |
| Expiry date | Aug 14, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K2103/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A resistance spot welding method able to form a welded joint having delayed fracture resistance, includes, in order, applying a pressing force P1 (kN) to the plurality of steel sheets by welding electrodes while supplying a supplied current I1 (kA), while applying the pressing force P1, supplying a current Ic (kA) during a cooling time tc (s), repeating two times or more a pressure force raising and lowering cycle of supplying a supplied current I2 (kA) to the welding electrodes while applying a pressing force P2 (kN) to the plurality of steel sheets by the welding electrodes during a pressing time tf (s), then immediately applying a pressing force P3 (kN) during a pressing time ti (s), applying the pressing force P2 during the pressing time tf, and releasing the pressing force and ending the supply of current, satisfying 0≤Ic<I1, 0.3≤I2/I1<1.0, P2/P1≥2, tf≤0.2, P3<P2, and ti≤0.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.