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Eddy Current Test

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Eddy Current Test

Eddy Current Test uses electromagnetic induction to detect flaws in conductive materials. The ECT set-up consists of a circular coil that is placed on the test surface.

The alternating current in the coil generates a changing magnetic field which interacts with the conductive test surface and generates an eddy current.

The flow of ECT can be disrupted due to changes in resistivity or conductivity, magnetic permeability, and physical discontinuities.

The change in eddy current flow and a corresponding change in the phase and amplitude are measured against known values.

Eddy Current Test Method

ECT method can detect very small cracks in or near the surface of the material, the surfaces need minimum preparation.

The biggest advantage of the eddy current test method is that it can be employed to determine surface flaws on painted or coated surfaces.

ECT flaw detection is commonly used in the aerospace industry, crane industry, concrete pumping industry, and other general industries where the protective surface coating cannot be removed.

The crane industry and crane owners benefit most from the application of the ECT method to detect surface flaws underneath the protective coating (paint ).

The exorbitant cost of paint removal and repainting is eliminated by applying the ECT flaw detection method as compared to the magnetic particle test.

It is also useful for making electrical conductivity and coating thickness measurements.

ECT is commonly employed for rapid thickness testing of coatings – conductive and non-conductive.

The principle of ECT which measures the change in resistivity in the conductive material makes it useful in a wide range of applications such as conductivity measurement, sorting of material, assessment of heat treatment condition, sorting of materials based on hardness and strength, and thickness measurement of thin components.

Compared to other surface flaw detection methods, ECT requires highly trained, skilled, and experienced technicians.

HITS professionals are qualified, certified, and experienced in the Eddy Current Test.