How does temperature impact Eddy Current Testing?

Temperature significantly impacts Eddy Current Testing because it can alter both electrical conductivity and permeability of the test material. When the temperature of a conductive material changes, the resistance and the magnetic properties of that material are affected. Higher temperatures typically increase electrical resistance, which can decrease the amplitude of the eddy currents generated in the material. Conversely, in some materials, permeability can change with temperature, influencing how eddy currents flow through the material.

Changes in conductivity and permeability can lead to variations in the test signal, which is crucial for accurately interpreting the presence of defects or material characteristics. Therefore, understanding and accounting for temperature variations are essential in ensuring consistent and reliable testing results in Eddy Current Testing protocols.