What characterizes conductive materials in Eddy Current Testing?

The characteristic that best defines conductive materials in Eddy Current Testing is that they generate eddy currents in response to an alternating magnetic field. When conductive materials are exposed to an alternating magnetic field, changes in the magnetic field induce circular currents, known as eddy currents, within the material. This is the fundamental principle of Eddy Current Testing, as it allows for the detection of flaws or variations in conductivity, thickness, and other material properties.

The generation of these eddy currents is crucial because it enables the interaction between the eddy currents and the testing probe, leading to measurable changes in the phase or amplitude of the returned signal. These changes are used to assess the integrity of the material being tested. Therefore, the ability of conductive materials to generate eddy currents is essential for the effective application of this testing method.