TOFD inspections are performed on welds of simple geometry, such as longitudinal and circumferential welds, it is of great advantage if also the nozzles present in e.g. a pressure vessel can be inspected in the same go, and with the same technique.

The TOFD technique is an advanced ultrasonic inspection technique that fulfils a need for reliable inspections. It is a powerful technique because it can simultaneously detect and size defects. TOFD is now routinely used in a wide range of applications such as inspection of piping and pressure vessels.