What principle does the eddy current test utilize?

The eddy current test utilizes the principle of electromagnetic induction. This non-destructive testing method is based on the generation of eddy currents in a conductive material when subjected to a changing magnetic field. When an alternating current flows through a coil, it creates a magnetic field that induces circulating currents (eddies) in nearby conductive materials.

The characteristics of these eddy currents, such as their magnitude and phase, can provide important information about the material's properties and any discontinuities like cracks or voids present within it. By analyzing the response of the eddy currents, technicians can determine the thickness, conductivity, and integrity of the tested component without causing any damage to it. This makes the eddy current test a valuable tool in various industries for ensuring quality and safety in metallic structures and components.