Beside the technical part (the NDT technique must be capable to detect and size the material conditions searched for) the human factor is a key factor. A NDT procedure shall provide a useful step by step guidance for the inspector leading to a reduction of the human factor. This will also result in a systematical evaluation of the inspection results and will reduce misinterpretations.
This paper discusses some aspects which are important for establishing a NDT procedure for ultrasonic weld inspections.
In a general part, basic aspects of a ultrasonic weld inspection are discussed. This part focuses on factors influencing the inspection technique such as type of material, typ of flaw, geometry of the weld, access to the weld (from one or two sides) and selection of ultrasonic technique (wave mode, angle of incidence, frequency).
Another part deals with performing of an inspection. Aspects which have to be considered in order to properly perform an UT inspection are discussed: calibration of the equipment, coupling conditions, type of amplifier (linear or logarithmic) for signal recording.The next part focuses on the evaluation of an UT inspection. Major aspects for data interpretation which influence the decision process (flaw <-> no flaw) are discussed: geometrical indications, indications from the weld root, location of a reflector and ultrasonic wave mode.
Finally the results are summarised and recommendations are given. These recommendations will help to prepare a NDT procedure for ultrasonic weld inspection.
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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