ULTRASONIC FLAW DETECTING METHOD

摘要

PURPOSE:To improve flaw detection precision close to the end of the measuring surface of a test material by obtaining a correction factor to exclude the effects of the ineffective sound wave and multiple reflection with a reference material and correcting the measured flaw detection data with the factor. CONSTITUTION:A flaw detection test is firstly made on the reference material. The flaw detection data for each test position are stored in a reference material flaw detection data memory 10. After the tests on all the test positions are finished, the average value of the data is obtained by an average value arithmetic means 11 at the position where the ineffective sound wave and multiple reflection are not caused. The correction factor for each test position is then obtained by he correction factor for each test position is then obtained by the correction factor arithmetic means 12 from a specified equation based on the average value and the data for each test position. The correction factor obtained by the memory 12 is stored in a correction factor memory 13. A flaw detection test is then made on the test material. The measured data at each test position are stored in a test material flaw detection data memory 14. The measured data stored in the memory 14 are multiplied by the corresponding correction factor at each test position stored in the memory 13 by a data correction arithmetic means 15, and the corrected data are indicated 16.