NDTnet 1998 Aug, Vol.3 No.8

Abstract

The use of Time of Flight Diffraction (ToFD) on butt welds is becoming mature and the wish exists in The Netherlands and abroad to apply the technique to welded connections in more comples geometries, like nozzles, reinforcement pads/repair scales etc. However the ultrasonic phenomena are rather complicated, multiple reflections and mode conversions in combination with changing cross sections. The Non Destructive Testing specialists in The Netherlands, organised in KINT and co-ordinated via PMP, felt the need to explore the applicability of the ToFD technique on such geometries in greater details via a joint industry project.

This paper descibes the joint industry project, the complex geometries, selected samples, the relevance of modelling in the inspection planning and evaluation stage. It surveys the experiences gained and addresses aspects like the necessity of reference blocks and personnel training aspects. It localised unexpected alternative applications for the technique like non intrusive inspection - of nozzles in process equipment.

In general terms it can be concluded that ToFD inspection of comples geometries is feasible on most configurations provided the whole inspections process is supported by computer modelling in the inspection planning and data evaluation phase.

i Project office for research on Materials and Production Technology (PMP)
ii Dutch Quality Surveillance and Non Destructive Testing Society (KINT)

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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