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Experimental Comparison of Wave-field Based Ultrasonic Imaging with other Advanced Ultrasonic Weld Inspection Techniques

Non-destructive testing (NDT) based on ultrasonic wave propagation is a known method for detection and sizing of defects in steel components such as girth welds. In this paper, several standard inspection methods, such as time of flight diffraction (ToFD), phased array tandem technique, and phased array sectorial scan, are compared to an ultrasonic imaging technique based on inverse wave field extrapolation (IWEX). The performance of the methods is assessed on plate samples containing artificial defects according to an automated ultrasonic testing (AUT) procedure used in industrial inspections. Measurements obtained with the different techniques are compared in terms of detection, sizing accuracy, and ease of interpretation.