Ultrasonic method occupies a special place in non-destructive testing. Being one of the first and the most widespread it allows to detect both surface and inner defects of various types, perform thickness gauging and non-destructive structuroscopy.

Nowadays, the railway transport is one of the major means for transportation of goods and passengers. To assure the safety of cargo traffic it is crucial to use high-quality elements of the railway car wheelsets which are highly succumbed to a dynamic loading in-service. That is why the quality control during production of one of the wheelset elements, namely axles, is critical.

Work rolls is the main tool of the rolling manufacture, which ensures due quality of the finished rolled products. Uninterrupted operation of the powerful rolling mill and high-quality finished products depend a lot on the mill rolls surface condition and their quality.