eddy current inspection

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eddy current inspection

eddy current inspection
Eddy current which is induced in a disc moving through a nonuniform magnetic field.
A nondestructive testing technique (NDT) that interrogates a component for surface inconsistencies and conditions such as hardness, conductivity, etc. It can only be applied to conductive materials. Eddy current testing generates small alternating magnetic fields on the surface of the component, and these magnetic fields interact with conductive components to generate small eddy currents on the surface. These currents in turn generate their own secondary alternating magnetic fields that interact with the primary fields. By analyzing the interaction, the defects and the changes in the conductivity and the permeability of the surface can be analyzed. The detection limits of the technique depend upon the surface condition of the piece under examination. It is normally not possible to detect defects that are smaller than about three times the surface roughness of the component. The detectable length of defects depends upon the integrity of the scan pattern.
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References in periodicals archive ?
Based on testing method, it is divided into ultrasonic testing, radiography testing, visual inspection testing, magnetic particle testing & electromagnetic testing, eddy-current testing, liquid penetrate testing, and others.
* Perform eddy-current testing of the chiller's evaporator and condenser tubes (unless this has been done and documented within three years).
Eddy-current testing has proven useful in inspecting the condition of the tubes in surface condensers and feedwater heaters from the water side to identify tubes that have experienced significant degradation and should be plugged to prevent in-service failure.