Selection of Probe Angle of Contact Type Ultrasonic Detection System for Steel Pipes

All involved in the paper is how to select proper probe angles for the contact type ultrasonic detection system for steel pipes.According to the three pipe thickness/diameter ratios or T/D's, the probe angles are determined respectively.Based on relevant analysis, it is identified that in case of T/D ≤ 0.226, pure transversal wave will be used to detect the pipe body;in case of 0.226<T/D ≤ 0.260, transformed transversal wave will be used to detect the pipe body with the best angle of incidence as 23.6°;and in case of T/D>0.260, the probe angle will be less than the best incidence angle of 23.6°.