From the principle of eddy currents can be seen in
eddy current testing has the following characteristics:
(1) Eddy current testing is only applicable to the conductive material, if a non-conductive material, it can not induce a swirling current, it can not make use of eddy current testing.
(2) Eddy current testing is particularly suitable for detection of surface and near-surface conductive material.
(3) Eddy current testing does not need coupling agent. Electromagnetic Field in Eddy Current Testing substance is excited by an electromagnetic wave and particle nature are volatile, so between the probe (coil) can be coupled with the workpiece without having to spread, it can be non-contact detection. This is better than ultrasonic testing. Because ultrasound is a mechanical wave, can only propagate in the substance. So ultrasonic inspection coupling agent must be added between the probe and the workpiece.
(4) Eddy current testing for fast and automated testing.
(5) Eddy current testing can be applied to the detection of the high temperature metal, because the metal having conductivity at high temperatures.
(6) Eddy current testing is also suitable for detecting shaped material, as long as the coil into various shapes can be detected.
