Ultrasonic Inspecting of Body thread of Super-high Pressure Crystal Kettle with Small Angle Longitudinal Wave Angle Probe

This paper introduces the ultrasonic testing of in service super-high pressure crystal kettle body thread by using small angle longitudinal wave angle probe.Through the contrast test block design,the equivalent defects problems were solved and test proved that the method was practical,which might put forward a method for defect identification and analysis.