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White Papers


Demagnetization of large surface steel objects before welding
Large steel components are mainly joined by welding processes. The weld has often impact on safety, which is why the weld seam quality has a particularly high weighting. Residual magnetism reduces the quality and durability of the welds by disturbing the welding process (magnetic arc blow) and enhances susceptibility to magnetocorrosion (hydrogen embrittlement induced by magnetic fields). This paper introduces a new process for demagnetization of large steel surfaces.

   
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White Paper – Demagnetization of large surface objects





Magnetic attraction force on particles
The white paper introduces an approach based on model calculations an practical experiments in order to gain knowledge about the magnetic adhesion forces on ferromagnetic chips or particles. The paper addresses specialists in the field of parts cleaning, surface technology and powder metallurgy.



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White paper – Magnetic attraction forces on particles





Measurement of residual magnetism on ferromagnetic parts
New quality requirements for maximum permissible residual magnetism require standardized measurement methods.
Follow the link below for further information.



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  White paper – Measuring residual magnetism




Demagnetization as preparation process before industrial cleaning
The growing demands on cleanliness of ferromagnetic parts can only be achieved by using in advance powerful demagnetization processes.
Follow the link below for further information.


   


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Technical cleanliness / ISO 16232/VDA19


Low-level demagnetization as preparation process for shaping of metal powder parts
The process safe compaction of ferromagnetic powders requires low residual magnetism on the tooling. The flow of the metal powder is already reduced at residual magnetism over 2A/cm (2.5 Gauss). Powerful degaussing systems allow the effective demagnetization of powder press frames, adapters and sintered tungsten carbide punches and dies on site.

Powder press tool with high residual magnetism   Powder press tool with low residual magnetism
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  White paper – degaussing of powder presses




Residual magnetism on ferromagnetic parts
The magnetization of ferromagnetic parts is caused in practice from diverse sources. Technical equipments, such as lifting magnets, non destructive crack detection, magnetic chucks, magnetic tools, etc., are causing a magnetization of the part. Often residual magnetism on parts is detected too late after difficulties encountered in the manufacturing process or after customer complaints.
Follow the link below for further information.

   

  Reasons for residual magnetism on parts




Workplace safety and demagnetizers
Demagnetizers based on alternating field principle generate electromagnetic fields in the low frequency range. A workplace must fulfill rules of safety for areas where electromagnetic fields appear. Internationally, the recommendations and guidelines of the ICNIRP define exposure limits for electromagnetic fields. Concerning workplace safety, national norms apply, like for instance BGV B11 in Germany.
Follow the link below for further information.


  Workplace safety for demagnetizer operators


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