Eddy Current Surface Scan
Accurate method for verifying material integrity and conductive material coating thickness. Most commonly used for tubular inspections and verifying heat exchanger integrity, and for bundle life trending reporting to help prevent unscheduled outages due to unexpected bundle failure.
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What this test helps us understand
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- detecting surface-breaking or near surface cracking
- wear, variations in material composition
- the thickness of paint, cladding or non-electrically conductive coatings on electrically conductive materials
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What we commonly test
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- any inspection for ferrous and non-ferrous materials, ie. welds, pressure vessels, piping, ect...
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Test method summary
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- 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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