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 ET instruments can be small and portable, or large multi-channel devices. The method is used only on electrically conductive materials, both ferrous and non-ferrous. But since so many other easier techniques are available for ferrous materials, such as MT, ET finds its application more suited to non-ferrous materials.
An energized electric coil induces a magnetic field into the tested specimen. The fluctuating magnetic field generates an electric eddy current. The presence of a flaw increases the resistance to the flow of eddy currents. This change is electronically analyzed to provide flaw severity or material condition information.
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