Magnetic particle testing with fluorescent media
Magnetic particle testing with fluorescent agents detects surface and near-surface flaws in ferromagnetic materials through magnetic leakage fields. Under UV-A light, the accumulated particles become visible, highlighting even the finest cracks.
Physicochemical Mechanism of Action
Magnetic particle testing uses magnetic fields to bind fine particles such as silicon dioxide or chromium oxides to surface defects. These particles fluoresce under UV-A light and make cracks visible.
Metallurgical Relevance & Welding Risks
This test is especially important for parts with high safety requirements, as it can detect microscopic flaws. However, incorrect application or defective test materials can cause missed flaws or misinterpretations.
Workshop Practice & Action Instructions
1. Prepare the workpiece by cleaning it and removing any surface conditions.
2. Sprinkle the fluorescent test particles onto the area to be inspected.
3. Apply a magnetic field over the workpiece to bind particles to cracks.
4. Expose the workpiece under UV-A light and carefully observe for fluorescent spots or lines.