ANALYSIS OF THE ERRORS OF DETERMINING THE EQUIVALENT SIZE AND ORIENTATION OF A PLANE DEFECT UNDER MANUAL ULTRASONIC CONTROL

Abstract

The article reviews and analyzes the method of defect identification for determining the angle of inclination of a planar point defect to the input surface of an ultrasonic wave and its equivalent size during manual ultrasonic testing by the echo-pulse method. The method is most widely used in ultrasonic control of parts obtained by plastic deformation (forging, hot and cold stamping, rolling). This is due to the fact that defects in such parts are predominantly planar in nature. The method of ultrasonic defect identification is based on the use of a combined transducer P131-2.5-0i18-VO-04 containing two piezoelectric transducers in one housing with a normal input of a longitudinal ultrasonic wave and an input angle of 18º. The article presents a mathematical apparatus for the implementation of this method. Also presented is a software product that allows you to automate calculations when using this method of defect identification. The article carried out experimental studies of this method of ultrasonic defect identification, which showed its low error and high efficiency. The average value of the relative error in determining the angle of inclination of a planar point defect to the input surface of an ultrasonic wave was 1.525 %. The average value of the relative error in determining the equivalent size of a planar point defect located at an angle to the ultrasonic wave input surface was 1.192 %.