Development of a new technology of welding of high speed movement rails

Results of the study of welding modes influence following isothermal exposure of rail steel samples, made by admission of alternative current pulses after the welding quoted. The welding of the samples was made under laboratory conditions using the modernized machine for contact joint welding МС-2008М.Based on laboratory study data a method of contact joint welding, protected by a RF patent, was developed, enabling to obtain a welding connection of parts made of rail steel with uniform hardness distribution and small zone of thermal influence, meeting the elaborated by JSC EVRAZ ZSMK technical specifications for perspective welded joint connection of R65 rails of DT350 category. The proposed method enables to control the structure of welded rails connection without additional local thermal treatment.