Eddy Current Inspection (ECI)
Eddy Current Inspection is an advanced NDT technique utilised on conductive materials (ie ferromagnetic steels, stainless steels, nimonic 80a, etc). An alternating current is applied to an inspection coil, which creates a magnetic field, when placed next to a conductor it induces an ‘eddy current’ field in the material.
When this induced field is disrupted by a flaw it causes an imbalance which is magnified and shown on an oscilloscope. This particular medthod can be done through non-conductive or conductive coatings to test the weld/material underneath the coating.
It can be used for crack detection, material sorting and coating measurements.