Apparatus and method of discriminating flaw depths in the inspec

Details Apparatus and method of discriminating flaw depths in the inspec Apparatus and method of discriminating flaw depths in the inspec

1990-10-24

1992-02-04

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73643, G01N 2910

Patent

active

050850822

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.

REFERENCES:
patent: 3868847 (1975-03-01), Gunkel
patent: 4351190 (1982-09-01), Rehme et al.
patent: 4660419 (1987-04-01), Derkacs et al.
patent: 4727321 (1988-02-01), Huschelrath
patent: 4926692 (1990-05-01), Brokowski et al.

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