Abstract

The article introduces results of a program for validation of different ultrasonic test techniques for crack depth determination of surface breaking cracks. Two techniques, the TOFD technique and the angle beam testing with mirror effect, both using time of flight measurement of the diffracted signal from the crack tip, are employed. Since it is not certain that all crack edges generate diffracted waves, the optimized ultrasonic pulse echo technique should be used. Applying TOFD as an additional analytic method for verification of Impulse Echo Technique or Radiography results seems to be more applicable.

Table of contents |Full Text|

• Introduction
• Ultrasonic testing for defect detection
• The TOFD-(Time of flight diffraction-)Technique
• Crack depth determination with Impulse-Echo-Technique
• Conclusion
• Literature