J0420402 Visualization of Internal Defects by Electromagnetic Ultrasonic Flaw Detection Method (2^<nd> Report)

Abstract

The purpose of this study is to identify internal defects of stainless steel centrifugal casting tube using electromagnetic ultrasonic flaw detection method. However, electromagnetic ultrasonic flaw detection method is low energy conversion efficiency. Further stainless steel is large wave attenuation. Therefore, it is not possible to identify a defect in an electromagnetic ultrasonic flaw detection method. So it aims the recognizing defect by adapt the impedance matching to the electromagnetic ultrasonic flaw detection method. It was examined impedance matching in the case of varying the power supply frequency in this paper.