TY JOUR TI Validation of an Ultrasonic-Phased Array Method for Testing of Circumferential Welds at Thin-Walled Pipes KW validation KW ultrasonic testing KW phased array transducers KW radiation inspection JO NDT World AU Brosius , D.. AU Schubert, F.. AU Hillmann , S.. AU Bor , Z.. PY 2016 IS 19 PB LLC SVEN