Avtomaticheskaya Svarka (Automatic Welding), #2, 2019, pp. 51-60
Heat treatment of butt welded joints of high-strength railway rails (Review)
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine.
There is a mass use of high-strength rails, which are welded by different methods, in construction of high-speed continuous trunk railways. Necessity of implementation of heat treatment operation of butt welded joints into a rail string production cycle has acquired specific importance with appearance of high-strength rails having high content of carbon. An aim of presented review is analysis of the problems and forecast of the perspectives of current technologies of heat treatment of high-strength rail butt welded joints. Different methods of heat treatment used in industry were considered. Various schemes of heating and cooling of rail weld and their effect on formation of microstructure and mechanical properties of joint metal were analyzed. A review of references showed that the technology of heating with high-frequency currents with further quenching of a head is the most essential in performance of heat treatment of butt welded joints of high-strength rails. 31 Ref., 6 Fig.
Keywords: continuous rail track, high-strength rails, butt welded joints, heat treatment, hardness, microstructure, high-frequency currents, defects
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