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概要

In Japan, a performance demonstration (PD) system for certifying WOL inspection methods is being developed. The Japanese qualification requirements dictate that either real IGSCC or equivalent flaws that produce ultrasonic responses similar to IGSCC be used in the qualification test samples. Studies have shown that it is very difficult to control the growth of deep IGSCC in weld overlay samples, so the Japanese have selected an alternative flaw making process that is capable of produc ing equivalent responses. This study focuses on the tests performed to evaluate these alternative flaws, which are ‘laboratory grown' IGSCC. The major parameters compared in this study include echo height, signal to noise ratio of tips, and cha racteristics of the faces where there are flaws (branching and crack surface roughness) detected from testing equipment responses. This paper contains images generated for this comparison, coupled with corroborating measurements which were made.

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