eddy current test

This document discusses eddy current testing, a non-destructive testing method. It uses an alternating current in an excitation coil to generate an eddy current in the test material. Variations in the eddy current caused by flaws are detected and analyzed. Advantages include fast scanning, no couplant needed, and ability to inspect through coatings. Limitations include requirement for conductive materials and limited depth of penetration. Applications include surface crack detection and material sorting.