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EDDY CURRENT INSPECTION

Eddy-current testing is one of many electromagnetic testing methods used in non-destructive testing (NDT) which makes use of electromagnetic induction to detect and characterize surface and sub-surface flaws in conductive materials.

Applications
The two major applications of eddy current testing are surface inspection and tubing inspections.

• Surface inspection is used extensively in the aerospace industry, but also in the petrochemical industry. The technique is very sensitive and can detect tight cracks. Surface inspection can be performed both on ferromagnetic and non-ferromagnetic materials.

• Tubing inspection is generally limited to non-ferromagnetic tubing and is known as conventional eddy current testing. Conventional ECT is used for inspecting steam generator tubing in nuclear plants and heat exchangers tubing in power and petrochemical industries. The technique is very sensitive to detect and size pits. Wall loss or corrosion can be detected but sizing is not accurate.