中文摘要：

相控阵超声检测技术灵活、可靠、高效,适于特种设备焊缝的无损检测。针对相控阵超声斜入射脉冲横波检测特种设备的低碳钢材料焊缝时,扇形扫描角度范围存在问题,通过理论计算声波在有机玻璃楔块-钢界面的透射率,发现扇形扫描时声束的折射角度范围为38°~90°时可行,但考虑到声束偏转角度过大时有效声辐射口径变小等实际问题,建议扇形扫描中角度范围上限不大于75°。

英文摘要：

Phased array ultrasonic testing technology is flexible,reliable,efficient and suitable for special equipment welds nondestructive 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 plexiglass 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 of 75°is suggested.