Abstract: Aiming at the features of the ultrasonic testing for hightemperature fastening bolt used in thermal power plant, the comprehensive testing process was introduced, in which the longitudinal wave testing method with small angle is adopted, and the transverse wave testing method is used as assist measure. The experiences of practical defects detection were summarized. The effective testing of the hightemperature bolt with size greater than or equal to M32 was realized.
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Key words: high-temperature fastening bolt, ultrasonic testing, transverse wave testing method, testing process