Study on Sectorial Scan Angle Range for Phased Array Ultrasonic Testing in standard setting

Phased array ultrasonic testing technology is of flexible, reliable, efficient and suitable for special equipment welds non-destructive testing. Sectorial scan angle range was investigated in this paper for phased array ultrasonic oblique incident pulse shear wave testing of special equipment welds made in low carbon steel. The theoretical calculation of ultrasound wave energy transmission coefficient through the plexi-glass wedge steel interface was carried out. We find that setting sector scan beam deflection angle range to 38 ° to 90 ° is feasible. When the beam deflection angle is too large, some actual problems will emerge such as effective acoustic radiation dimension comes small, so that upper limit of the sectorial scan angle is 75 ° is suggested.