Abstract: Critical Remarks regarding the European TOFD Draft standard

Abstract:
Critical Remarks regarding the European TOFD Draft standard P. Kreier, Innotest AG, Eschlikon (CH); G. Brekow, BAM, Berlin *
DGZfP-Seminar in Saarbrücken, 17.-18. November 1997
English Translation by R. Diederichs

|German Full Text|

TABLE OF CONTENTS

Full Text
- - Abstract
1. Introduction
2. Specimens and reference bodies
Specimens with welds, Specimens with notches
3. Defect detection with impulse echo technique, measurement results
4. Measurement arrangement of the TOFD-Technique
5. Measurement results of the TOFD-Technique
6. Conclusion
7. References

Abstract

The ultrasonic testing method time of flight diffraction (TOFD) was applied at selected weld specimens of 15 to 60 mm wall thickness consisting 1mm to 5 mm spark-eroded applied artificial notches. The TOFD results are compared with the detail results of the pulse echo method. The TOFD technique is able to detect defects within the middle section of the wall, but the results for near to surface defects are restricted. That means that weld defects which need to be recorded according to the established standard (e.g. HP 5/3), can not be detected reliably and in conformity to the new European draft standard. (DGZfP proceeding).

|NDTnet Index|
|NDTnet|