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Inspectioneering Journal

Can TOFD Replace Conventional UT for Weld Inspection?

"Some Important Points when Considering TOFD as an Inspection Technique"

By H. Wuestenberg. This article appears in the July/August 1998 issue of Inspectioneering Journal

The debate about advantages and drawbacks of the application of the TOFD (time of flight diffraction) approach for ultrasonic weld inspection should not forget the original reasons for its introduction in the 1960s. The major advantage at that time had been the better crack detection in comparison to x-ray techniques, especially in view of an increased use of steels and welding technologies with a the presence of diverse cracking phenomena (e.g. cold cracking, transverse cracks etc.).

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