Method and apparatus for determining the acceptability of a weld formed by applying repetitive pulses of energy to the weld site
US4086817A · kind A · utility
5Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1977 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Jul 5, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Stress wave emission signals emanating from a weld during an AC welding operation are detected during (1) the time when the AC power is on, (2) the post weld time period, and (3) during each half-cycle of the AC weld when the absolute magnitude of the current is decaying. The stress wave emission signals are counted in each of these periods and compared to predetermined ranges of values to determine the acceptability of the weld.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.