Method of detecting a pinhole at a welded portion of an article
US5235845A · kind A · utility
11Cited by
10References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1992 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Sep 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Suction is applied to a pipe of an article. Then, the interior of the pipe is maintained under vacuum conditions for a period of several seconds. This is checked or monitored by a pressure switch. If the pressure in the pipe is raised from the predetermined level, then a pinhole is formed at a welded portion of the pipe to be examined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.