Optimizing your Impeder Ferrite Cores

Using the right ferrite core can reduce the amount of power consumption that your tube mill uses and greatly effect your operations bottom line.

The proper placement of the ferrite in relation to the weld point are very important factors in achieving efficient weld performance. The ferrite should end approximately 1/8” past the centerline of the weld rolls (see figure below). This improves the impeder’s ability to focus the current on the actual weld zone where optimum energy is needed.

Ferrite sizing:
A general rule for ferrite core sizing is; the larger the ferrite diameter, the faster the obtainable weld speed.

Keep it cool:
Coolant temperature is very imprtant to the longevity of the ferrite core. Ferrite needs to be kept as cool as possible during operation. As operating temperatures rise, the ferrite’s ability to concentrate flux will decrease. The mill coolant should be kept at a constant 70-77 ∞F (20-25∞C).

If you find it difficult to keep your coolant temperatures this low, you can add a chiller on your mill. If you do not have a chiller and would like information, Kent Corporation representatives would be glad to assist you.

Be Careful:
It is important to remember that ferrite cores are a ‘ceramic’ material and should be handled with care. Dropping the impeder can cause the ferrite core inside to break and thus reduce the initial permeability of the impeder. Kent Corporation carefully packages its ferrite cores to ensure the safest delivery possible.