Title: DETECTION OF INTERNAL DEFECTS USING THE TECHNICAL TOFD
Abstract: The Time of Flight Difraction technique ( TOFD) allows a significant simplification of standards compared to the conventional ultrasound inspection methods. Depending on the use of two transducers (transmitter/receiver) which waves propagate longitudinally, the diffraction of waves permits the characterization of internal defects more quickly and effectively. On the basis of ultrasonic signals are emitted in the longitudinal direction by a given angle, the frequency of the transducer as well as the signals propagating angle influences the sizing of defects. Starting from the use of specimens with pre-sized defects, this paper aims to examine the influence of symmetry and asymmetry of the distance between the transducers, the frequency and the angle of propagation of ultrasonic waves in the detection small and large discontinuities in welded joints of carbon steel. Experiments were carried out and analyzed using statistical techniques under conditions that minimize the measurement error. For a 3 mm defect, results in the best accuracy was obtained for a frequency of 5 MHz and 70 ° angle. On the other hand, for a defect 6 mm, the best accuracy was obtained for the frequency of 5 MHz and 45 ° angle.
Publication Year: 2016
Publication Date: 2016-01-01
Language: en
Type: article
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