Expulsion detection method in electric resistance welding and apparatus therefor
US12409507B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2020 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Dec 8, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K2101/006
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In electric resistance welding for energizing a workpiece formed by superimposing plural metal plates, an energization resistance reduction amount between a pair of electrodes pressurizing the workpiece is detected at a specified time interval during each welding process under a specified welding condition, frequency distribution of the energization resistance reduction amount under the welding condition is calculated on the basis of data relating to the energization resistance reduction amount, the frequency distribution is fitted with a Gaussian function, and occurrence of an expulsion under the welding condition is determined on the basis of whether the fitting is statistically significant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.