Residual Magnetization Intensity
After switching off the magnetic field, part of the magnetic attraction remains in ferromagnetic materials. This affects the mechanical properties and behavior under stress.
Physical-Chemical Working Mechanism
Ferromagnetic materials like steel contain magnetic dipoles that are usually randomly oriented. An external magnetic field aligns these dipoles, giving the material its magnetic properties. After the field is turned off, some dipoles remain aligned, causing residual magnetism.
Metallurgical Relevance & Welding Risks
The residual magnetization level can affect mechanical strength and behavior under stress. Too high residual magnetization can lead to increased hardness and grain size, reducing toughness. This can cause cracks or fractures, especially under dynamic loads.
Shop Practice & Action Guidelines
To control residual magnetization, handle the weld area and environment carefully. Use magnetometers before and after welding to ensure the level stays within acceptable limits. For materials with high mechanical property requirements, use special demagnetizing procedures.