Apparatus and method of discriminating flaw depths in the...

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

G - Physics

01

N

G01N 29/04 (2006.01) G01N 29/06 (2006.01) G01N 29/11 (2006.01) G01N 29/24 (2006.01) G01N 29/27 (2006.01) G01N 29/30 (2006.01) G01N 29/40 (2006.01) G01N 29/44 (2006.01)

Patent

CA 2052389

CASE 5090 ABSTRACT OF THE DISCLOSURE An apparatus and method for discriminating between flaw depths of 570 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 57 or less, thereby avoiding waste in time and materials.

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