Eddy Current Testing (ECT)

Eddy Current Testing (ECT) is a non-destructive testing method that uses electromagnetic induction to identify surface and near-surface defects in electrically conductive materials. When an alternating current flows through a coil placed near the test surface, it generates an oscillating magnetic field, which induces eddy currents in the material. Disruptions in the flow of these currents—caused by cracks, corrosion, or other discontinuities—alter the coil’s impedance, which is then measured and analyzed. ECT is highly sensitive to small defects, requires minimal surface preparation, and is especially effective for inspecting thin materials, tubing, and layered structures in industries such as aerospace, automotive, and power generation.