异形构件的超声检测方法研究

Study on Ultrasonic Testing Method of Profiled Component

由于异型构件上端直径小、壁薄、内壁存在内棱角等,给超声检测带来很大的困难,且内棱波严重干扰了超声回波信号的识别。提出使用超声爬波检测异型构件的方法,在此基础上采用提取回波信号的时间与幅度双特征量的信号处理方法进行缺陷识别。测试结果表明:该检测与信号处理方法可满足在线检测技术的实时性、准确性和可靠性等要求,具有广泛的应用前景。

Since upper end of profiled component has some structural features,such as thin wall,small diameter and arc trough on inner wall,it is very difficult to detect the profiled component by ultrasound.And the waves reflected from the inside arris have badly interfered the identification of echo signal.The ultrasonic creeping wave used to examine the profiled component was proposed.The defects were identified through processing method of extracting double characteristic values of time and amplitude of echo signal on this basis.The testing results indicate that the detection and signal processing method can meet the technical requirement,such as real-time,accuracy and reliability;and have broad application foreground for on-line detection.