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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2024

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Thermal treatment of railway wheels using the PTA method

Wilga P., Labisz K., Konieczny J., Bąkowski H., Szymański K., Mańka A.

Journal of Achievements in Materials and Manufacturing Engineering

2024

Vol. 126, nr 1

31--41

Purpose: The traditional method of regeneration of railway wheels is the correction of the shape of the running surface by reprofiling using semiautomatic lathes adapted to machining and measuring the parameters of railway wheels. Traditional reprofiling causes the thickness of the rim to decrease over time to such an extent that it has to be replaced. During reprofiling, at least 6 mm of metal is removed from the running surface of the wheel. Design/methodology/approach: One of the possible effective ways to create, produce, analyse, and optimise new and existing industrial production processes of metal treatment, including laser technologies, is to develop qualitative and quantitative knowledge helping to understand the thermal processes existing in the mutual relations between wear resistance and hardness. Findings: As a result of accidents that occurred on the world railways, it was found out that the traditional surfacing process, including cladding and or remelting, is not used for wheel regeneration for safety reasons. Research limitations/implications: Therefore, fibre laser cladding was chosen for investigation as a more sophisticated tool compared to the often used Diode Laser, which has a more accurate laser beam with even higher energy density. Depending on the situation and the welding technique used, the weld can be made with materials in the form of fine powder, wire, or self-shielding wire. Practical implications: As a result of cladding, the surface layer can be enriched with metal particle, and in some cases, a high-quality top layer can be obtained. Concerning the original practical implications of this work, it was important to investigate the appliance possibility of cladding for enhancement of the surface properties. Originality/value: The scientific reason was also to describe structure changes and compounds occurring on the remelted laser surface. It is also important to determine the laser treatment parameters, particularly the laser power, to achieve a high value of layer hardness and wear resistance to protect the newlynew developeddeveloped material from losing their properties and to make the wheels surface more resistant to wear.