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EDDY CURRENT TESTING (ECT)
Eddy Current Testing (ET or ECT) is one of the advanced Non - destructive Testing method is one of the methods from electromagnetic testing methods and is defined as a circulating electrical current induced in a conducting material by an alternating magnetic field.In eddy current testing we are using electromagnetic induction to inspect and identify discontinuity and defects on surface and sub-surface of conductive material.
The main application of Eddy Current Testing is in tube inspection and in surface inspection. In aerospace and petrochemical industries we are mainly using surface inspection because of its high sensitivity that can also detect tight cracks.
For surface inspection eddy current testing is not only limited for ferromagnetic materials, it can also be used on non-ferromagnetic materials. Whereas in tube inspection eddy current testing can be done only on non-ferromagnetic material tubes. Eddy Current testing can also be used to inspect electrical conductivity and coating thickness measurements.
Advantages of Eddy Current Testing
- Eddy current testing is very sensitive for small defects and discontinuity.
- Eddy current testing is used to detect defects on the surface and near-surface.
- Complex shape material can also be inspected.
- Results are immediate and equipment is also portable.