September 2020, Vol. 247, No. 9


Using Phased Array UT in Lieu of Radiography for Weld Inspections

By Guy Maes, Zetec For years, inspectors have used industrial radiography for nondestructive testing (NDT) of welds and heat-affected zones on large-diameter pipes. Like a medical X-ray machine uses radiation to highlight cracks in a bone, conventional radiographic testing (RT) uses X-rays or gamma rays in combination with film to indicate welding flaws and defects.  With a pair of ultrasonic probes, the inspector can use phased array and TOFD, and more recently TOFD and TFM, to detect all welding flaw types. (Photo: Zetec) Improved portability and processing have brought phased array UT to locations that once were considered out of reach.

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