Eddy current inspection is performed by inducing eddy currents into a part and electronically monitoring variations in the induced field. The NDI technician interprets the character of the observed field change to determine the nature of the defect.
The ability of Eddy Currents to detect cracks decreases with increased thickness of the metal being inspected. The practical limitation is approximately .090” in common aluminum aircraft skins such as clad coated, 2024 T3.
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