NDT.net - September 2000, Vol. 5 No. 09

Nondestructive Material Testing with Ultrasonics
- Introduction to the Basic Principles -

TABLE OF CONTENTS
    Introduction
1. Why use ultrasonics for nondestructive material testing?
2. Ultrasonic testing tasks
3. Detection of discontinuities
4. Method of testing and instrument technology
5. Locating discontinuities
6. Evaluation of discontinuities <=
6.1 Scanning method
6.2 Evaluation of small discontinuities: The DGS method
6.3 Sound attenuation
6.4 The reference block method
6.4.1 Comparison of echo amplitudes
6.4.2 Distance amplitude curve
7. Documentation
8. Diagnosis of indications (outlook)
    Reference list

6. Evaluation of discontinuities

Fig. 70a Weld testing with the USD 10 Fig. 70 b A discontinuity to be recorded, DBR 14,4 dB Fig. 70c A discontinuity not to be recorded; DBR -9.2 dB.

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