Job Knowledge 23 Eddy Current Testing.

摘要

Eddy current testing is an inspection method that can be used for a variety of purposes including the detection of cracks and corrosion, material and coating thickness measurement, material identification and, in certain materials, heat treatment condition. The process relies upon a material characteristic known as electromagnetic induction. When an alternating current is passed through a conductor- a copper coil for example - an alternating magnetic field is developed around the coil, the field expanding and contracting as the alternating current rises and falls.