The structure and the principle of ultrasonic non-destructive testing
system of journal bearings are described in this article. The testing
principle is based on the influence of adhesion quality on the amplitude of
ultrasonic signal, reflected from the interface between layer and main
metal. The measurements are performed using pulse response technique with 5
MHz immpersion transducers. The developed ultrasonic system consist of the
electronic unit, scanner, testing tank and IBM PC type computer with
specialized software. The test results can be presented in the usual A, B,
C scan modes imcluding options of signal processing, which allow determine
the zones of delamination. The experimental results and the method for the
evaluation of the total area of detectyed zones of delamination are
presented also.