NDT Method
How Eddy Current Works
An explanation of how eddy current testing uses electromagnetic induction to detect surface cracks.
Overview
Eddy current testing works by passing alternating current through a coil, which creates a changing magnetic field. When the coil is placed near a conductive material, it induces circulating eddy currents in the surface.
A defect such as a crack disrupts the flow of these eddy currents, changing the coil's impedance. The instrument detects this change and alerts the inspector.
The Process
- Energise the probe coil
- Induce eddy currents in the material
- Detect impedance changes from defects
- Interpret signals to locate cracks
Frequently Asked Questions
Related Services
NDT Australia provides these services nationwide with certified, mobile inspectors and clear, compliant reporting.