Abstract
COMSOL Multiphysics was used to establish an ultrasonic guided wave detection model of bend pipes to resolve the defect detection challenge presented by gas station process piping, analyzing the propagation characteristics of the ultrasonic guided wave in the pipeline and the influence of its detection defect signal according to different factors. The results showed that the T (0, 1) mode guided wave generated by the sinusoidal current signal at a frequency of 50 kHz propagated along the pipeline axis, displaying a high rate of corrosion defect detection in bend pipes. The intense defect echo signals at excitation frequencies of 30 kHz, 50 kHz, and 70 kHz are compared and analyzed, indicating that the optimal excitation frequency was between 50 kHz and 60 kHz for a pipe with an exterior diameter of 219 mm and a wall thickness of 8 mm. In addition, the echo signals in straight pipes and bend sections were compared and analyzed, showing that the bend characteristics affected defect detection and caused a deviation in the axial positioning of these flaws. Therefore, the larger the distance between the defects and the bend, the larger the deviation of the axial positioning of these defects.
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