METHOD FOR ULTRASONIC TESTING OF CYLINDRICAL ARTICLES Russian patent published in 2005 - IPC

FIELD: non-destruction testing processes, possibly ultrasonic testing of cylindrical articles such as railway road wheels, bands, drums, pulleys and other products.

SUBSTANCE: method comprises steps of irradiating surface ultrasonic waves across cylindrical surface of article and receiving echo-signals caused by flaws; extracting signal passing around article n times; regulating amplification degree of received signals while sustaining constant amplitude of extracted signal; setting threshold levels for time intervals between probing signal and signal that passes around article one time, at time intervals between one time passing and two times passing signals, between two times and three times passing signals; evaluating flaw occurrence according to echo-signal exceeding threshold levels. Said threshold levels are set while taking into account features of distributing ultrasonic oscillations at their circulation in material of article. Number of n extracted signal is selected according to construction of cylindrical article and conditions of propagation of ultrasonic oscillation in it.

EFFECT: enhanced reliability and efficiency of testing articles.

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