What is one of the main limitations when using eddy current testing on conductive materials?

The main limitation of eddy current testing when applied to conductive materials is its inability to detect subsurface defects. Eddy current testing operates by inducing currents in the conductive material, and the response of these currents is then analyzed to assess the material's integrity. However, the depth of penetration of the eddy currents is limited, typically to just a few millimeters below the surface. As a result, any defects that are located deeper than this range, such as cracks or voids, may not be detected by the eddy current technique. This limitation is important for applications where subsurface conditions are critical, making it essential for technicians to consider complementary testing methods if subsurface defect detection is necessary.