Apparatus and method of discriminating flaw depths in the inspection of tubular products
US5085082A · kind A · utility
80Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Oct 24, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2634
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for discriminating between flaw depths of 5% and 10% of the tube wall thickness of electric resistance welds are disclosed. At least two electromagnetic acoustic transducers (EMATs) are employed to generate ultrasonic surface and shear waves. A logic circuit discriminating means selectively activates an alarm for flaw depths of about 10% or greater, but does not activate the alarm for flaw depths of about 5% or less, thereby avoiding waste in time and materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.