The basic principle of ultrasonic non-destructive testing technology is introduced, and its theoretical and practical delamination detection sensitivity is deduced and verified by Newton Ring. Then, both of cladding interface and bottom surface of a multi-layer composite contact are tested by ultrasonic testing system to check delamination defect. The delamination defect in the cladding interface is also checked by metallographic microscope and scanning electron microscope to verify the results of ultrasonic testing. This study shows that ultrasonic testing method is a suitable way for testing low-voltage electrical contact welding quality and cladding quality.
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