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Eddy Current


Basic Test Theory
Eddy current testing is an electromagnetic technique. When an energized coil is brought near to the surface of a metal component, eddy currents are induced into the specimen. These currents set-up magnetic field that tend to oppose the original magnetic field. The impedance of coil in close proximity to the specimen is affected by the presence of the induced eddy currents in the specimen.

When the eddy currents in the specimen are distorted by the presence of the flaws or material variations, the impedance in the coil is altered. This change is measured and displayed in a manner that indicates the type of flaw or material condition.

Applications range from crack detection, to the rapid sorting of small components for either flaws, size variations, or material variation in the aerospace, automotive, marine and manufacturing industries. Good for inspection of holes.

Limitations of the Process
Eddy Current can only be used on conductive materials.

Equipment Needed
Eddy Current Unit
Eddy Current Probes


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