Operating principle of the Eddy Current Testing method - Eiwaa Group

   Eddy Current Testing is a non-destructive method for testing metal surfaces for defects such as cracks or discontinuities. Such surface defects have high-frequency electromagnetic interactions that allow them to be detected manually or automatically, depending on the requirement, and evaluated.


Defect resolutions of up to 30 µm are possible under optimum conditions. The testing is normally contactless. For this reason, eddy current testing neither damages nor contaminates surfaces.


Modern sensors, electronics, and software solutions offer a variety of application and evaluation options for the metal-producing and metal-processing industry as well as for mobile use in maintenance testing.



The extremely low media consumption and maintenance expenses of eddy current testing have made it one of the most economical and environmentally friendly non-destructive testing methods, and it is therefore widespread in 100% testing in production processes as well. In addition, the high testing speeds and the testing automation mean that the production process is not interrupted.


Eddy Current Testing (EC) or Eddy Current Surface Testing is used to inspect metallic parts and perform highly reliable flaw detection and alloy sorting of surface and near-surface defects. Eddy current probes generate magnetic fields that induce current that flows in a test piece influencing the magnetic field and magnitude and phase of voltage in the coil.


Eddy Current Testing is widely used in the inspection industry and in other manufacturing and service environments that require inspection of thin metal for flaws and defects. In addition to crack detection in metal sheets and tubing, eddy current can be used for certain metal thickness measurements and one of its advantages is that surface coatings (up to a certain thickness) do not need to be removed prior to inspection.


The Eddy Current Testing technique can be used to examine large areas quickly and doesn’t need couplant as is required in UT inspections. The method is limited to materials that conduct electricity and is primarily used for surface or near surface flaw detection and inspection of surfaces at high temperature.

Eiwaa Group carries a full range of portable flaw detectors available to serve the broadest range of applications and our in-house inspectors are qualified and experienced in eddy current testing.


How is Eddy Current Testing Done?


Eddy current testing is carried out using a specially designed coil that is energised with an alternating current that creates a changing magnetic field surrounding the coil. The coil is placed within the proximity of a test surface where the changing magnetic field permeates the conductive material. This changing magnetic field in turn induces local electrical currents in the test surface that are known as eddy currents. These eddy currents create their own magnetic field that opposes and modifies the coil’s magnetic field, thus affecting the electrical properties of the test coil. The measurement of the changing phase and magnitude of the current flowing through the primary test coil or separate receiver-coil(s) provides the ability to determine the condition of the test sample.


Electrical conductivity and permeability variations, or the presence of discontinuities within the test-material cause a change in the eddy currents and thus a corresponding change to the phase and amplitude of the measured coil current. These changes can be displayed either individually by a needle meter or in combination on a 2D impedance plane display.


For more details visit our website: Eddy Current testing 


Contact: +9715650 35752


Address: P.O. Box : 28346,  Abu dhabi, UAE


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Location: Saudi Arabia

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