Eddy Current Testing

Eddy current testing is a non-destructive method that is used to detect the surface cracks, bolt hole cracks, second- and third-layer cracks of conductive materials based on the principle of electromagnetic induction. When the detection coil with alternating current is close to the conductive test piece, the test piece will cause eddy current due to the action of the magnetic field of the coil. The size, phase and fluidity of the eddy current are affected by the electrical conductivity of the test piece, and the reaction of the eddy current changes the impedance of the detection coil. Therefore, by detecting the change of the coil impedance or the change of the induced voltage on the coil, we can find out whether the material is defective or not.

Test Capabilities

• Crack detection: Detect defects in materials and components, such as cracks, folds, pores and inclusions.
• Conductivity measurement: Measure the conductivity, permeability, grain size, heat treatment, hardness and size of the material.
• Metal sorting: Sort metal materials or parts by examining the differences in composition, microstructure and physical properties.
• Coating thickness measurement: Measure the thickness of non-metallic coatings on metal materials, non-ferromagnetic coatings on ferromagnetic materials.
• Material thickness measurement: Measure the thickness of metal foils, plates and pipes to identify rust and corrosion.
• Measure the diameter of pipes and bars.

For more information about our eddy current testing, please contact us.