Eddy Current Impedance Plane Analysis
Eddy current impedance plane evaluation is a graphical representation of measurement values in an impedance diagram to differentiate conductivity, lift-off, and crack depth. It enables precise defect classification.
Physical-Chemical Mechanism of Action
Wirbelstrom impedance-plane evaluation is based on measuring a material's electrical resistance (impedance) under the influence of eddy currents. These measurements are displayed in a complex impedance diagram, where different physical properties like conductivity and lift-off show up as separate planes.
Metallurgical Relevance & Welding Risks
This evaluation is especially important for checking weld quality. It can precisely identify and classify defects like porosity, cracks, or poor fusion. Misinterpreting can lead to missed defects, which is a risk for safety and component life.
Workshop Practice & Action Steps
To get a correct eddy current impedance-plane evaluation right, follow these steps:
1. Measurement: Use a suitable impedance meter and take readings in the complex impedance diagram.
2. Display: Plot the values graphically so you can see separate planes for conductivity, lift-off, and crack depth.
3. Interpretation: Analyze the diagram to spot and classify defects. Compare the results with the material and welding procedure specs.