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Kjellberg Finsterwalde has presented the PSI 350 plasma transferred arc (PTA) welding plant.

Plasma transferred arc (PTA) welding means that components are coated with a hard alloy, depending on the kind of stress they are exposed to by mechanical wear and corrosion.

PTA welding is required for extruder screws and rollers, the armouring of valve seats in the automotive industry and in the manufacture of fittings, for example.

These coatings can be used for new components as well as for the repair of worn parts.

The coating thickness may vary between 2mm and 5mm when welding single layers.

The heat conduction and the kind of filler material are determined by the properties that the component requires, the coating and the stress that the component is exposed to.

For wear protection purposes, ferrous, nickel and cobalt alloys are preferred because they are characterised by high hardness, high corrosion resistance or a combination of both properties.

The wear resistance can be further increased by inserting dissimilar hardening materials such as carbides.

The availability of a variety of plasma powders made from these alloys opens up a range of applications for PTA welding.

The base material of the PSI 350 is only melted on the surface so that the diffusion between the wear resistance alloy and the substrate material remains low.

This guarantees the constant properties of the coating, according to the company.

The advantages are: high hardness and corrosion resistance, which increases the lifetime of the coated components: a smooth surface; the precise thickness of the layer; almost no requirement for follow-up work; little heat input on the base material, making it suitable for sensitive materials; and a high welding speed.

Kjellberg Finsterwalde

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