NDTnet 1998 Aug, Vol.3 No.8

Abstract

The ultrasonic testing of a thick-walled ferritic component with austenitic cladding on the inside surface is discussed. In this study some ultrasonic techniques for detection and sizing of defects in near clad-area and extending to the ferritic base material are assessed. As an ultrasonic technique for detection and rough defect sizing bi-noise-band evaluation is used. As a more precise defect sizing technique SAFT (synthetic aperture focussing technique) isused as well as normal crack tip diffraction evaluation with 0° probe. The choice of the technique varies from the crack to crack. Mode conversion of ultrasonic waves plays important role in detection measurements of defects.

The measurements are performed partly with mechanised linearly amplified and partly with logarithmically amplified ultrasonic equipment. The measured signals are compared with each other. The effect of the cladding to the formation of the bi-noise-band is discussed. Also the effect of the angle of incidence on the inside wall is studied with 2 MHz probes in order to find optimum angle for defect detection.

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

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