Eddy Current Testing (ET)

 ET is an electromagnetic non-destructive testing technique used to detect both surface and slightly subsurface defects in conductive materials. The method generates a magnetic field that induces eddy currents in the material, and any material changes (e.g., cracks, roughness) cause disruptions in these currents, which are detected and visualized by the instrument.

Advantages:

• No need to remove coatings.
• Can detect subsurface defects.
• A clean and fast method.

Limitations:

• Only applicable to conductive materials.
• Affected by geometry and surface condition.
• More complex to perform.