Method of resistance spot welding of galvanized high-strength steel with good joint performance
US11167370B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2017 |
| Grant date | Nov 9, 2021 |
| Priority date | — |
| Expiry date | Mar 25, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/241
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A resistance spot welding method of galvanized high-strength steel with good joint performance, in which three welding pulses are used within one spot welding schedule. The method includes applying a first welding pulse and a second welding pulse which are used for generating a nugget and suppressing the generation of liquid metal embrittlement (LME) cracks, respectively. The first welding pulse generates a nugget having a diameter of 3.75T1/2-4.25T1/2 in which T represents a plate thickness. The second welding pulse causes the nugget to grow at a rate less than a rate of growth during the first welding pulse. A third welding pulse, which is a tempering pulse, is applied for improving plasticity of a welding spot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.