September 2020, Vol. 247, No. 9

Features

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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