Development of Depth Measurement Technique for a Flaw in Weld Area of Stainless Steel with Twin Matrix Array Ultrasonic Probe
石田 仁志 Hitoshi ISHIDA 黒住 保夫 Yasuo KUROZUMI 藤井 登 Noboru FUJII
fatigue crackmatrix array probeSCCstainless steeltwin transducerultrasonic testingweld
A twin matrix array transducer to make possible to detect and measure a flaw with test direction through weld of austenitic stainless steel has been developed. Each transducer performs as transmitter and receiver and has 2 lines and 16 columns array elements respectively. With this transducer depth measurement tests for cracks by stress corrosion cracking (SCC) and fatigue on austenitic stainless steel weld pipe specimens have been carried out.As the results: (1) Corner echoes and ti p echoes from SCCs and fatigue cracks could be detected with test direction through the weld of the 25mm thickness stainless steel pipe specimens. (2) The depth measurements through the weld and in base metal corresponded well.Therefore we have evaluated that the twin matrix array transducer made possible to measure flaw depth with both the test direction and was effective ultrasonic testing technique to be able to estimate and evaluate flaw depth with more accuracy and reliability.