NDTnet 1998 Aug, Vol.3 No.8

Abstract

Most ultrasonic testing specifications contain echo amplitude evaluation of discontinuities with regard to a recording threshold. In turn, this is related to the size (diameter) of a prespecified reference reflector and is dependent on the test requirements. In the past, two methods, which competed with each other, were generally accepted worldwide: the DGS method and the Reference Block method. However, the competitiveness between the two methods is more of a political matter because anaylses show that both methods are very similar and therefore "peaceful coexistence" is the only effective solution. In doing this, the advantages of both methods can be fully used and the individual disadvantages largely avoided.

The combination of different methods of evaluation no longer poses a problem using the capabilities of modem ultrasonic instruments: the graphics user-interface and interactive mode with the operator makes adjustment and testing procedures lucid and reliable without having the burden of "dull theory".

The objective of our contribution is to illustrate the similarity of both methods and the combined application from the practical point of view. We also believe that the exclusive application of a certain evaluation method, as documented in many test specifications, cannot be maintained in the long-term but that the selection of the evaluation method should be made in relation to the application. On the other hand, the user is also able to adapt better to the specifications of third parties using a combination of both methods.

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:

Publication Contact:
7th ECNDT, Park Alle 345, DK-2605 Broendby, Denmark, Fax: +45 46 26 70 11, Email: 101373.3414@compuserve.com