Resistance welding method, resistance welder, and method and device for evaluating resistance welding
US8779320B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 20, 2010 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Dec 22, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/115
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Exemplary embodiments provide a resistance welding method capable of stabilizing quality or improving efficiency of resistance welding such as spot welding. This resistance welding method comprises a calculating step of calculating resistance ratio X of a second electric resistance value R2 of workpieces to be joined in residual heat after Joule heating stops to a first electric resistance value R1 of the workpieces immediately before the Joule heating stops or vice versa (R2/R1 or R1/R2); a determining step of determining whether the resistance ratio X is equal to or greater than a threshold value Xn, and a reheating step of carrying out the Joule heating again when the resistance ratio X is smaller than the threshold value Xn. Thereby at least part of a welding portion is melted and solidified to reliably form a nugget, and a stably resistance-welded member can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.