Method and apparatus for determining weld quality in percussion welding
US4609806A · kind A · utility
74Cited by
8References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 23, 1985 |
| Grant date | Sep 2, 1986 |
| Priority date | — |
| Expiry date | Sep 23, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/22
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The quality of welds produced during a percussion welding process are determined in real time by sensing the vibrational impulse signals produced during the percussion welding process, filtering the impulse signal to select a frequency band containing frequency components associated with the vibrations imparted to the forge rod of the welding machine, measuring the mechanical damping characteristics of the selected spectral portion of the signal by determining the log-decrement of the envelope of the signal, and comparing the measured log-decrement value obtained with a preselected threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.