Case Studies / Time of Flight Diffraction in lieu of Radiography

Time of Flight Diffraction in lieu of Radiography

Requirement

The Southern Ireland based client had a requirement to replace radiographic testing with an automatic encoded ultrasonic system in accordance with BS EN ISO 13588 due to the excess site restrictions by their NDT contractor performing onsite industrial radiography.

Solution

Time of flight diffraction (TOFD) was selected as the automated ultrasonic testing technique for its ability as a screening tool that can rapidly scan welds and produce very accurate measurements of any defects found. The client had numerous weld bevels types & dimensions which were difficult to detect planar defects when using radiography, therefore TOFD was selected for its ability to accurately measures defects, regardless of the defects' orientation

A full validation was performed in accordance with BS EN ISO 13588, where numerous welded samples containing seeded defects were successfully scanned & analysed.

Forth Inspection Service developed the TOFD procedure, oversaw the validation process & provides ongoing support, including offline analysis of data via a dedicated Dropbox.

Benefits

Changing to an automated ultrasonic technique means that

  • Reduced inspection time
  • No radiation, hazard, or additional licensing or personnel
  • Accurately measures defects, regardless of the defects' orientation

Time of Flight Diffraction in lieu of Radiography


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