Figure 10 – TOFD theory on weld inspection. Tipical image formation.
Talking about automation in ultrasonic inspection, the use of TOFD technique on weld eliminates the need of multi-channels UT pulse-echo devices decreasing inspection costs. “Time-of-flight” gives information about defect depths and heights ins an better way than conventional pulse-echo UT.
The use of TOFD on the evaluation of turrets defects was decided because of the great amount of TOFD application on weld inspection with good results.
Figure 11 – TOFD theory on weld inspection. Real weld inspection image with defects.