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Plain bearings — Metallic multilayer plain bearings — Part 1: Non-destructive ultrasonic testing of bond of thickness greater than or equal to 0,5 mm
The ultrasonic signal reflected by the bond interface between the bearing metal and the backing is used to determine bonding defects.
Ultrasonic testing is not possible on edge zones of sliding surface, flange sides, joint areas, oil holes, grooves, etc. in a range of less than half the diameter of the ultrasonic probe because of undefined reflections. The same applies to bearings with dovetail keying grooves at the bond. Ultrasonic testing of bond does not apply along the edges of the dovetails.
Evaluation of the bond on the visible transition from the backing to the bearing metal (on end faces or joint faces) is only practicable by the penetrant testing method specified in ISO 4386-3.
This document only describes in detail the pulse-echo method. Within the meaning of this document, the ultrasonic method only permits a qualitative evaluation of the bonding and not a quantitative determination of the bond strength. The ultrasonic bond test differs only between bond and bond defect.
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