High-Frequency Eddy Current Testing
High-frequency eddy current testing is an electromagnetic surface inspection with high frequencies that precisely detects sub-millimeter cracks and fissures in conductive materials. It is used to reveal internal material defects.
Physical-Chemical Mechanism of Action
High-frequency eddy current testing (HFECT) uses high-frequency electrical signals that are passed through the workpiece. These signals reflect at locations with material defects and can be recorded by a receiver.
Metallurgical Relevance & Risks in Welding
HFECT is especially useful for inspecting weld areas, as it reveals internal cracks and fissures in conductive materials. Misinterpretation or lack of inspection can lead to undetected material defects, which may later cause cracks or failure.
Workshop Practice & Action Instructions
For correct HFECT performance, the workpiece must be clean and dry. The signal frequency should be adjusted according to the material and the inspection size. Results should be interpreted by a qualified technician to ensure no material defects are overlooked.