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    • 6. 发明公开
    • METHOD FOR THE ALUMINO-THERMITE WELDING OF RAILS AND DEVICE FOR CARRYING OUT SAID METHOD
    • EP3202522A4
    • 2018-07-04
    • EP15845828
    • 2015-05-14
    • LYKOV ALEKSEI MIKHAILOVICHKULCHITSKIY VLADIMIR ANTONOVICH
    • LYKOV ALEKSEI MIKHAILOVICHKULCHITSKIY VLADIMIR ANTONOVICH
    • B23K23/00
    • B23K23/00
    • This invention relates to the field of welding and may be used, for example, when repairing rails of railway tracks. Welded rail ends are installed into the split mold with formation of the welding gap between edges thereof. The reaction crucible with the additional container, wherein filler metal having predetermined chemical composition is disposed, is installed above the mold. Said container is preheated up to the temperature of 100-700°C, after which the crucible is loaded with aluminothermic mixture, rail ends and split mold are heated, and aluminothermic mixture is ignited. As a result of exothermic reaction of aluminothermic mixture, the container with the melted filler metal is heated, after which it is fed through the drain neck at the container bottom to the mold, where it fills the welding gap. Filler material is cured until hardening and weld formation, after which the weld and heat-affected zone are initially cooled with a compressed air jet down to the temperature of 250-300°C, and then cooled in the air, and the weld top part is removed from the welded rail head. The ratio between weight G1 of filler metal in the additional container and weight G2 of aluminothermic mixture in the crucible is selected within the range of G1/G2= 0.1-0.6, whereas metal and slag are removed from the reaction crucible to the receptacle after welding. If necessary, it is possible to add powders or nanopowders of carbides, carbonitrides or nitrides of transition metals to filler metal. Use of this invention allows achieving high quality of the rail weld and heat-affected zone, which results in enhancement of stress-related characteristics of weld metal and high performance characteristics thereof. 2 independent and 5 dependent claims, 3 drawings.