Magnetic particle testing using alternating current yoke magnetization
Magnetic particle testing using AC yoke magnetization produces an alternating magnetic field on the part surface. The skin effect concentrates detection optimally on true surface flaws.
Physicochemical Mechanism of Action
Magnetic particle testing uses an alternating current magnetized by a hand yoke. The skin effect ensures that the magnetic field is stronger at the surface than inside the material. This concentrates the magnetization optimally on the surface.
Metallurgical Relevance & Welding Risks
This method is particularly well suited for testing weld defects such as cracks or corrosion. A faulty result can lead to errors in the workshop, as it may not detect all surface defects. It is important that the device is correctly calibrated and the components are clean.
Workshop Practice & Instructions
1. Make sure the components are clean and free of dirt layers, as these can affect magnetization.
2. Use an alternating current of 50 Hz to 60 Hz for optimal results.
3. Adjust the strength of the magnetic field to the type and size of the components to ensure sharp detection.