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Remanence or 'rest'-magnetism

Residual magnetism is often caused (either intentionally or unintentionally) by magnetic fields from the immediate vicinity, such as clamping tables, magnetic conveyors or induction heating. Other causes include arc welding, machining processes, cold forming and even mechanical vibrations.

Small demagnetizing unit     Magnetism in milling parts

 

The consequences of residual magnetism may be desirable, problematic or even very costly. A nut that clings to the end of a screwdriver is handy, but two products that stick together in a mould disrupt production, resulting in financial losses. Other possible consequences of undesired magnetism: a coarse surface after galvanization, welds that only penetrate on one side, rapid wear of bearings, or metal chips that stick to the parts.

These consequences can be avoided by demagnetizing the material.

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Anizotropia

Kiedy materiał magnetyczny zostanie umieszczony w polu magnetycznym, taki materiał określany jest mianem preferencyjnie zorientowanego i anizotropicznego. Materiał anizotropiczny może być magnesowany tylko z orientacją preferencyjną.