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TOFD (Time of Flight Diffraction)

Time-of-Flight Diffraction (TOFD) is one of the techniques which allows to detect material discontinuities. TOFD is mainly used in weld testing, where it enables accurate discontinuities measurement with the possibility of defining their type. Due to the computer recording of measurement data, TOFD allows to fully document test results as well as analyse and verify them in any given time.

Compared with the standard defectoscopy or radiography weld tests, TOFD has the following distinguishing features:

  • high rate of flaw detection

  • small number of false indications

  • 3D discontinuity geometry measurement

  • imaging welded joints in axis, perpendicularly to the face

  • computerised data registry which can be analysed with proper software

  • possibility of testing welds up to 300 mm thick

  • speed and accuracy of tests

  • mobility, regardless of type and thickness of a welded joint

The above-mentioned assets allow TOFD to be used both for automatic tests as well as to confirm the results of standard ultrasonographic tests. TOFD can also detect those cracks which have an unfavourable orientation in material's thickness for the pulse-echo method. This creates a further quality confirmation while testing vital or critical installation components.

Tests made with TOFD provide a fast, thorough and, most importantly, credible control of weld quality and ensure safe operation.

A robot for TOFD testing

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