The Application of NDT Ultrasonic Flaw Detection in the High Speed Rail

This paper introduces the work theory of NDT ultrasonic flaw detection instruments and details all kinds of preparing items: manufacture of sample rail, sensibility adjustment of ultrasonic instruments and exacted repetitive test of standard sample rail. This paper makes a lot of application experiments of NDT in the high speed rail ultrasonic flaw detection. Following conclusions were drawn through stating, contrasting, assaying and analyzing: the whole capability of NDT is stably and credible; and the inspection rate of high speed rail is lower than other rails. Although the phenomenon of undetected fault during inspection is not found, there are still a few miscalculations, many of which are centralized in the middle of checked rail due to oxidation, sulphuration and silication.