Eddy Current

An accurate method for verifying material integrity and conductive material coating thickness. Most commonly used for tube inspections and verifying heat exchanger integrity, and for bundle life trending reporting to help prevent unscheduled outages due to unexpected bundle failure.


What this test helps us understand

  • wear, variations in material composition
  • the thickness of paint, cladding or non-electrically conductive coatings on electrically conductive materials

What we commonly test
  • heat exchanger tubes for pitting, fretting, cracking, erosion or corrosion thinning 
  • plant inspection for non-ferrous materials


Test method summary

  • eddy current testing is essentially a near-surface technique
  • is based on the principle of measuring changes in the impedance of an electromagnetic coil as it is scanned over a surface of conductive material
  • a circular coil carrying an AC current is placed in close proximity to an electrically conductive specimen
  • the alternating current in the coil generates an alternating magnetic field, which interacts with the test material and induces eddy currents into the item being tested
  • variations in the electrical conductivity or magnetic permeability of the test item, or presence of any flaws, will cause a change in eddy current flow and corresponding change in the phase and amplitude of the measured current

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Preparing a Quote

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  • Under normal circumstances, your quote will be returned to you within 24-48 hours