Welding technology was developed for the M76 rail steel (GOST 8161-75) and high-manganese steel 110G13L (GOST 7432-87), and the insert was made of 08Kh18N10T austenitic steel (GOST 563-72). In the experiments, the duration of heating was varied for different intensity, flashing and upsetting allowance. The experimental results were used for the determination of the optimum parameters of the welding process ensuring the required mechanical properties of the welded joints. The following conclusions can be made: The welded joint between M76 rail steel and 110G13L steel, produced by resistance flash welding through the insert of 08Khl 8N10T steel, is characterised by the formation of non-equilibrium structural components with the intermediate chemical composition, susceptible to phase transformation with the precipitation of carbides and formation of the quenched structures. The application of resistance flash welding, characterised by highly concentrated heating combined with the controlled thermal-deformation process, makes it possible to reduce the volume fraction of the structures in the welded joints and ensure stable mechanical properties of the welds. A technology has been developed for resistance flash welding of railway junctions, resulting in the required mechanical properties without any additional heat treatment. The tests of the welded junctions in different climatic conditions in the railways systems of the Russian Federation and the Ukraine showed high service properties of the junctions. The experimental results show that in service of the welded railway junctions, the material of the insert (08Kh18N10T steel), the central piece (steel 110G13L) and the rail and (steel M76) undergo cold working, and the metal of the central piece and the insert is characterised by high hardness in comparison with the metal of the rail end. The degree of wear of the component in the zone of the inset is determined by differences in the degree of deformation required for producing sufficiently high hardness on the rolling surface, and wear takes place in the initial stage of service and does not increase any further.
Technology and equipment for resistance flash welding of railway crossings with rail ends through an austenitic insert
Welding International ; 22 , 5 ; 338-341
2008
4 Seiten, 5 Bilder, 2 Tabellen, 2 Quellen
Aufsatz (Zeitschrift)
Englisch
Abbrennstumpfschweißen , Eisenbahn , Kreuzungspunkt , Schweißtechnologie , Wärmeleistung , Schweißarbeit , Parameteroptimierung , Phasenumwandlung , Carbid , Werkstoffgefüge , mechanische Eigenschaft , Wärmebehandlung , Härte , Verschleißeigenschaft , Verformungsgrad , Mikrostruktur , Duktilität , Umwandlungszone , Wärmeeinflusszone , Ermüdungsriss , Schweißausrüstung
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