Abstract
Small opening notches are used to simulate cracks in butt welds. The study of the influence of the notch edges orientation on their detectability when using pulse-echo and diffraction methods of ultrasonic testing. It is shown that the processes occurring during the elastic waves scattering on cracks must be modeled by a three-dimensional problem. However, theoretical analytical and numerical studies in this area most often concern two-dimensional problems of elastic waves diffraction, when the target studied edge is located on the acoustic axis of the ultrasound transmitter and / or receiver and is oriented perpendicular to the incident beam. The article presents experimental results illustrating the influence of the target point (edge) orientation in three-dimensional problems on the received signals both when using diffraction schemes of the TOFD type, and in the classical ultrasonic testing by the pulse-echo method according to the "tandem" scheme and with the turn of the transducers according to the "duet ".
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