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1993
Conference Paper
Title
Untersuchungen zum Einfluß von ferritischen Phasen in austenitischen Schweißnähten auf die Schallfeldvermessung mit elektromagnetischen Sonden
Abstract
The propagation of elastic waves in anisotropic material like austeniic welds is at present one of the major targets in the field of ultrasonic basic physics. To verify the theoretical predictions often ultrasonic through tranmission experiments ar conducted where by teh transmissions amplitude is received using a point like electromagnetic-acoustic tranducer. The contend of delta ferritic phases in austenitic welds influences the sensitivity of electromagnetic-acoustic transducers (EMAT's) and led to a misinterpretation of experimental results. Using a laser influence is quantitative estimated and in addition componed with measurements using piezoelectric transducers