Eddy Current Impedance

Physical-chemical mechanism of action

Impedance in eddy current testing is determined by the alternating resistances and inductances in the workpiece. Induced eddy currents generate a magnetic flux, which in turn causes an electrical impedance.

Metallurgical relevance & risks in welding

Increased resistance can indicate cracks or differences in conductivity. Incorrect test conditions can lead to false results, endangering quality assurance.

Workshop practice & instructions

Use a test coil with the correct frequency and voltage. Make sure the workpiece surface is clean and contact is proper. The measurement should be done at constant temperatures to get accurate results.