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Eddy-current test uses electromagnetic induction to detect flaws in conductive materials.

The eddy current test set-up consists of a circular coil which is placed on or near the test surface. The alternating current in the coil generates a changing magnetic field which interacts with the conductive test surface and generates eddy current. The flow of eddy current can be upset due to a change in resistivity or conductivity, magnetic permeability, any physical discontinuities. The change in the flow and a corresponding change in the phase and amplitude is measured against a calibrated value.

Eddy current inspections can detect very small cracks in or near the surface of the material, the surfaces need minimum preparation in comparision to dye penetrant or magnetic particle inspections. One of the biggest advantage of the eddy current test method is that protective coating like paints or coatings do not need to be removed to effectivly test for defects.

Eddy current 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 benefits most from the application of eddy current test method to detect surface flaws underneath the protective coating (paint ).

The exorbitant cost of paint removal and repainting is eliminated by applying eddy current flaw detection method as compared to magnetic particle test. It is also useful for making electrical conductivity and coating thickness measurements. Eddy current test is commonly employed for rapid thickness testing of coatings - conductive and non-conductive.

The principle of eddy current test which measures the change in resistivity in the conductive material makes it useful in the following range of applications:

  • Bolt Hole Inspection
  • Gear Inspections (Minimal Grease Removal Required)
  • Pressure Vessel Welds
  • Pressure Piping Welds
  • Crane joint Welds
  • Heat exchanger Tube Inspection
  • Thin Material Measurements
  • Coating Thicknesses

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

Vertest professionals are trained and experienced in  eddy current test. We hold proven procedures in eddy current test and performs test in accordance with AS 4544, ISO 17643, ASME V Article 8, AS 2331.1.4, ASTM E376, ASTM E1004, ASTM E703, ASTM E566 and similar national and international standards.

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