Recognition of Defect Signals for Phased Array Ultrasonic Inspection of Small-Diameter Tubes

In view of some common typical defects of small-diameter boiler tubes and based on the comparison of theoretical simulation and actual testing data, the typical characteristics of different types of defects are summarized and refined in this paper. Obtained results can be used as a guidance for defect identification, and they are beneficial for the inspectors to qualitatively evaluate the defect more accurately.