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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. Having two products stick together in a mould is an undesirable situation; this interrupts production and therefore costs time and money.
Magnetically conductive metals, such as steel products and tools which are processed or come into contact with magnets, can easily become magnetized. For example, after contact with clamping tables or after magnetic conveyance. Other causes include welding, grinding, bending, machining, deep drawing and even mechanical vibrations. Depending on the type of metal (material structure, alloy), this magnetism may be retained in the object.
Unwanted residual magnetism can cause many problems in a production process, such as:
In other words: undesired residual magnetism costs time and money and has a negative impact on the quality of finished products.
Goudsmit industrial demagnetizers remove undesired magnetism or reduce it to a negligible level.
It is also possible to temporarily neutralize a magnetic field with a counterfield, in order to weld a magnetic product for example.
Goudsmit not only supplies degaussing systems but also offers on-site demagnetization of your products as a service. For example enabling pipeline repair:
Non-magnetically conductive material such as stainless steel can also become magnetically conductive after a machining operation. Demagnetization (or degaussing) therefore often takes place during or after machining processes, many times just before packaging. But it is often also possible to demagnetize packaged products.
Based on experience, as well as experimentation, we have compiled a table of the field strength usually present in steel products:
The objective of demagnetization / degaussing is to reduce the residual magnetism to a maximum of 5 gauss. With a magnetic field meter you can measure the exact field strength and direction of the field.
We demagnetize a product by exposing it to asufficiently strong, alternating counterfield of decreasing strength, which gradually reduces the flux density. See hysteris in ferromagnetic materials - BH curve.
Depending on the type, shape, dimensions, speed and quantity, there are several options available for eliminating undesired magnetism. A few examples:
Small components such as drill bits: through use of a hand-held degausser.
Thick materials such as moulds: with a low-frequency demagnetizing tunnel.
Materials that have an irregular surface or large dimensions: with a demagnetizing tunnel with conveyer belt.
For products in boxes or on pallets a very practical solution is a roller conveyor with demagnetizing tunnel.
Choosing the right demagnetizing system is a matter of experience and depends in great part on the product. We offer customer-specific solutions, with an optimal demagnetization effect, that fit well in your production process. For complex products, we are happy to test your product at our test centre to determine the correct demagnetization system.
Demagnetization tunnels are suitable for removal of magnetism in both hard and soft metal tools and large or long products.
Plate demagnetizers are used for the removal of magnetism from flat metal products or those that are magnetized on one side only.
The hand-held demagnetization units are intended for demagnetizing tools and machine parts in difficult-to-reach places.
The compact, mobile demagnetization unit is flexible and easy to move. Ideal for hard-to-reach places or when you don't need to demagnetize daily.
With the mobile demagnetization unit from Goudsmit Magnetic Systems it is possible to remove unwanted magnetism at any location.
Goudsmit Magnetics Group
5582 HA Waalre
+31 (0)40 2213 283