An Ultrasonic Detecting Method Testing for Defects in Profiled Component

Profiled component has some structural features, such as thin wall, small diameter and corner angle on inner wall. These features make it very difficult to detect the profiled component with ultrasound method, and the waves reflected from the inside arris have badly interfered the identification of echo signal. The ultrasonic creeping wave is used to detect the profiled component. In order to eliminate impact of inner edge wave, echo signals are divided into two parts to assure the fatal defect in the top of inner arc is not undetected. Time and amplitude characteristic value of flaw signals are extracted to distinguish between flaw signal and inner edge wave effectively. The testing results indicate that the detection with above feature extraction method can meet the application requirements of real-time, accuracy and reliability, and it would have good application foreground for on-line detection.