EddyCurrentTests
Eddy current testing (ECT), also called eddy current tests, is a non-destructive method for evaluating conductive materials. An alternating current in a probe coil generates a changing magnetic field that induces eddy currents in the test piece. Flaws, changes in conductivity or permeability, and geometric variations alter the eddy current flow and produce measurable changes in the coil impedance or signal phase.
ECT uses various probes: surface, differential, encircling coils, and arrays. Techniques may be impedance-based, phase-based, or
Applications include aerospace tubing and skins, automotive components, power plants, and other metal parts. It is
Advantages: rapid, sensitive to small surface and near-surface flaws, suitable for complex geometries, minimal preparation, and
Limitations: limited depth sensitivity; mainly applies to conductive materials; ferromagnetic materials can complicate interpretation; lift-off and
Standards: procedures and calibration are guided by standards from ASTM International and ISO for eddy current