Time Scaling and Frequency Invariant Multiresolution Analysis of Ultrasonic NDE Signals

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Date
1998
Authors
Polikar, R.
Udpa, Lalita
Udpa, Satish
Spanner, J.
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Review of Progress in Quantitative Nondestructive Evaluation
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Abstract

Nuclear power plant pipes are periodically inspected for possible cracks that occur in the heat-affected zones of welds. Intergranular stress corrosion cracks (IGSCC) are the most common type of cracks encountered particularly in stainless steel piping. Three major factors are required for the formation and propagation of IGSCCs, the tensile stress on the inner diameter of the weld region, a corrosive environment and a sensitized grain structure. When these flaws are not detected early enough, the consequences can be disastrous, and therefore the detection of IGSCCs is of significant interest to the nuclear industry.

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Thu Jan 01 00:00:00 UTC 1998