Magnetic Particle Vector Field Magnetization
Magnetic particle vector field magnetization uses superimposed magnetic fields in different directions to detect cracks regardless of their orientation. The vector field captures both longitudinal and transverse flaws.
Physicochemical mechanism of action
The technique uses multiple magnetic fields that are superimposed in different spatial directions. These fields magnetize the material under test and cause magnetic particles to agglomerate at cracks or flaws. The magnetic attraction thus creates a visible marking of the defects.
Metallurgical relevance & welding risks
This method is especially useful for inspecting weld flaws, as it detects both longitudinal and transverse defects. It can identify cracks in various materials and with different welding processes. One risk is that fine or obscured cracks may not be made visible if the magnetic particles are not applied correctly.
Workshop practice & instructions
To use the technique successfully, the following steps must be followed:
1. Prepare the material under test and remove all metal particles or contaminants.
2. Apply the magnetic particles to the material surface.
3. Activate the magnetic fields in the desired directions and pass them over the area under test.
4. Observe whether the magnetic particles agglomerate at cracks or flaws and mark them accordingly.