Remanent Magnetization
Remanent magnetization is the residual magnetism in ferromagnetic materials that remains after removing the external magnetic field. This can cause component failures and may need to be resolved by demagnetization.
Physicochemical Mechanism of Action
Ferromagnetic materials like steel contain microscopic magnetic domains. These domains can align in the direction of an external magnetic field and remain magnetic even after the field is removed.
Metallurgical Relevance & Welding Risks
Residual magnetization can cause component failures, especially in electric motors or sensors. It can affect measurement precision and lead to malfunctions in the device. Additionally, it can make welding more difficult and cause uneven stresses, which can lead to cracks and distortion.
Workshop Practice & Instructions
To remove residual magnetization, demagnetization is applied by creating an external magnetic field in the opposite direction. This should be done as a final step when assembling components, especially in electrical engineering and sensors. The exact method depends on the material and the application area.