Partnering opportunity

The Serbian company producing mangan-zinc ferrite impeders for high-frequency welding of tubes is offering its technology to integrators of welding equipment


A Serbian company developing and producing magnets and magnetic components for electric devices has developed a new generation of mangan-zinc ferrite cores for impeders for high-frequency (100-500 kHz) welding of tubes. The cores generate high magnetic fields 8-16kA/m, and sustain working temperature up to 80ºC and come in user defined shape. The cooperation with integrators of welding equipment is sought for commercial agreement with technical support or technical cooperation agreement.

Partner sought

Industrial partner : integrator of welding equipment Commercial agreement with technical assistance : To provide its own specifications and then to integrate cores into its welding equipment Technical cooperation : to co-develop with the company welding equipment for new specific needs (new technical sectors/new markets)


The company is Serbian SME within technological park and is developing magnets and magnetic components. The latest development concerns a new generation of mangan-zinc ferrite cores (impeders) for high-frequency 100-500 kHz welding of tubes which can be highly customized (primary shape) according to the final use. The current mangan-zinc ferrite cores have a better characteristics with respect to generating high magnetic fields 8-16kA/m, and sustaining working temperature up to 80ºC. These impeders are ideally suited for their application and they can be customized to be incorporated in welding equipment enhancing its energy efficiency, stability, and improving quality. The company is now looking for integrators specifically working in the integration or servicing of equipment for automated tube welding. Impeders dramatically improve the efficiency of the welding process by directing more energy towards the edges of the strip. The high frequency magnetic field created by the work coil induces a current which flows around the outer surface of the tube. Impeders are less necessary when welding non magnetic materials. This because the degree of high frequency “skin effect” varies among different materials and is most pronounced in carbon steels. Below Curie temperature, 90% of the current flow in carbon steel is confined to within 0.005" of the surface. The skin depth is greater for non magnetic materials, typically 0.040" in the case of aluminium. Since current cannot flow in two opposite directions at the same time, materials that are thinner than twice the skin depth have less need for impeders, and light walled aluminium tubing is often welded without them. There is always some benefit to be gained from using an impeder. In addition to opposing current flow around the inside surface of the tube, an impeder increases the transfer of energy from the coil to the strip by “focusing” the energy in the area where it is needed. The coil has to produce a much stronger (and larger) magnetic field if an impeder is not used, and this causes wasteful and destructive heating of the weld rolls and other steel parts in the vicinity. This cooperation could be either through a commercial agreement with technical specifications where the company would develop and deliver components corresponding to the requirements of the client. Maintenance could also be provided. Alternatively a technical cooperation could also be of interest where both partners co-develop specific welding device according to new needs.

Advantages and innovations

-. mangan-zinc ferrite cores characteristics can be higher than existing solutions in the market especially if customized to specific need; - the cores are generating high magnetic fields 8-16kA/m, and sustaining working temperature up to 80ºC; - the cores allow high frequencies 100-500 kHz for welding of tubes; -. there is a larger price flexibility for customization services compared to competitors.

Development stage

Already on the market

Intellectual Property Rights (IPR)


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