Abstract
Generally there are 5 sorts of internal defects of weld, namely blow-hole, slag-inclusion, lack of fusion, incomplete penetration and crack; but under existing circumstances, it is difficult to classify these defects by ultrasonic echo-pulse testing. For the purpose of studying to classify welded defects by ultrasonic spectrum analysis, at the outset, we attempted to distinguish crack from the other defects. We searched for each associated ultrasonic spectrum connected with NDI-STB-A2-4 mmφ hole, NDI-STB-Al (I.I.W. type)-1.5 mmΦ hole, incomplete penetration, crack and fractured surface by calculation and ultrasonic spectrum analyser.As the associated ultrasonic spectrum of crack has great roughness as compared with those of the other defects, crack can be distinguished from the other defects by associated ultrasonic spectrum.
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