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Introduction & Basic Principle

ECT is working on the principle of induced current called Eddy Current when current carrying coil brought in to a specimen. Indicators reveal discontinues that alter the patch of the induced currents.


Eddy current is used to detect discontinuities in metals on surface and subsurface discontinues, hardness, and thickness, plating coating (non metallic) and sheet thickness measurements.

Primary Advantages

Eddy current testing has the advantage over other types of nondestructive test of an almost instantaneous indication of a defect once the test procedure has been set up. The test procedures are readily adaptable to go/no-go situatins. The method is senstivie to many physical and metallurigical variables and thus it has wide application provided the variables not of interest can be eliminated or suppressed. The equipment is portable and easy to adapt any site condition. ECT is used as good testing tool for condition assessment of heat exchanger tubes.

Primary Disadvantages

Inspection depth limited to less than one inch. Eddy current testing does not give physical shape of discontinuities and results depends on many variables such as conductivity, permeability and material hardness and the operator skill. The procedures are applicable for only conductive materials. Before the examination, tubes must be cleaned on the inside to bare metal.





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