What is a significant limitation of Eddy current testing?

Eddy current testing (ECT) is specifically designed to work with conductive materials, making the characteristic that it can only be used effectively on these types of materials a significant limitation. The process relies on inducing eddy currents within conductive materials using an alternating magnetic field. When the test coil is brought close to a conductive surface, the alternating magnetic field produces eddy currents that can be measured to identify flaws or material characteristics.

This limitation does not apply to non-conductive materials, as they do not allow for the generation of eddy currents. Moreover, while environmental conditions can impact the accuracy of measurements taken during ECT, this is not inherent to the fundamental operational limits of the test method. Additionally, while training is important for effective testing, it does not exclude users from utilizing the method, nor is it the primary limitation of ECT. Thus, the focus on conductive materials is a key aspect that defines the scope and applicability of Eddy current testing.