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See Chinese contents: YB/T 951-2014 YB/T 951-2014: Method of the ultrasonic testing for rails
This Standard specifies the terms and definitions, flaw detection principles, flaw detection methods, personnel requirements, flaw detection requirements, test pieces and sample rails, probes, equipment and apparatuses, signal-to-noise ratio, stability, operation, result determination and marking of ultrasonic testing for rails. This Standard is applicable to ultrasonic flaw detection of 37 cm/m ~ 75 kg/m railway symmetrical section rails and asymmetric section rails. Ultrasonic flaw detection of other rails can also be carried out with reference.
