Eddy Current Testing

Eddy Current testing is one of several NDT methods that uses the principal of “electromagnetism” as the basis for conducting examinations.

Eddy current testing is a non-contact electromagnetic testing technique used for the inspection of conductive materials without the need to remove non-conductive coatings. An alternating current is passed through a coil in order to create an alternating magnetic field which is used to induce a localised current (eddy current) into the material under test.

Discontinuities such as fatigue cracks will interrupt the flow of eddy currents and alter the terminal impedance of the test coil. The amplitude and phase of the received signal can be interpreted to ascertain the severity and exact location of any discontinuities found. Eddy current is routinely used to inspect a wide range of different materials and components across several fields of engineering including oil and gas, nuclear, power generation and aerospace.

Some advantages of eddy current inspection include:

  • Sensitive to small cracks and other defects
  • Detects surface and near surface defects
  • Inspection gives immediate results
  • Equipment is very portable
  • Method can be used for much more than flaw detection
  • Minimum part preparation is required
  • Test probe does not need to contact the part
  • Inspects complex shapes and sizes of conductive materials

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Eddy Current Testing - Ultramag NDT Inspection Services

In the proper circumstances, eddy currents can be used for:

  • Crack detection
  • Material thickness measurements
  • Coating thickness measurements

Conductivity measurements for:

  • Material identification
  • Heat damage detection
  • Case depth determination
  • Heat treatment monitoring
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