This paper deals with welding on high-carbon steel that is used for the production of tram and railway tracks. The high-quality and efficient maintenance of the track superstructure, especially the refurbishing of worn rails, is an integral part of the operation of rail transport. The rails are subjected to wear and tear and their overall replacement is wasteful and time-consuming, too. Therefore, refurbishing technologies are used that enable us to extend the lifetime of parts applied in technical practice. During the actual operation, the rails are worn out considerably in exposed places, such as the tramway curves in city transport or railway turnouts and frogs of both tram and railway lines. When welding the rails, the aim is to achieve better wear resistance and, at the same time, to comply with all conditions and regulations for rail transport.This article presents new findings concerning the application of an interlayer with additional material that is different from the additional weld deposit material itself. Furthermore, it deals with the study of transition areas and their influence on the structure in the areas of weld metal, the interlayer, the heat affected zone and base material and mapping the influence on hardness and microhardness. Welding on worn rails using suitable technology can guarantee the unlimited repeatability of welding on further worn weld deposits. The paper evaluates the weld deposits with various additional materials under different welding conditions with the aim of improving the quality of rail refurbishing.Keywords: High-carbon steel, weld deposits, additional material, refurbishing, lifetime.
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