Method for heat treatment of a rail joint which is produced...

B - Operations – Transporting – 23 – K

Patent

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B23K 23/00 (2006.01) B23K 31/02 (2006.01) E01B 31/02 (2006.01) E01B 31/18 (2006.01) F23D 14/38 (2006.01)

Patent

CA 2204928

In order to improve the heating efficiency, to reduce the fuel consumption, to reduce the labor time and to improve the quality of the material joint in the region of a thermit welded joint between two rail ends, it is proposed that, immediately after the fusion welding, in particular using the residual heat which is still present, the joint region, that is to say the fused structure including the structure of the heat affected zones which are adjacent on both sides, be subjected to normalization treatment. A burner arrangement for carrying out this method is characterized by a symmetrical distribution of burners (18, 11, 20, 21) with respect to a longitudinal center plane (22) and a transverse center plane (14), two burners being intended and arranged for treating the head flanks in the region of the fused structure, and in each case four burners being intended and arranged for treating the rail foot (2) in the region of the heat affected zones. The heat treatment is carried out using different cooling rates for the rail head (7) and for the rail foot (2) on the basis that the result is a structure which has a running surface with improved wear resistance and a rail foot (2) which has increased ductility.

Pour améliorer l'efficacité de chauffage, diminuer la consommation de combustible, réduire le temps de main-d'oeuvre et rehausser la qualité du joint dans la région d'un joint soudé par aluminothermie entre deux extrémités de rails, on propose, immédiatement après le soudage par fusion, particulièrement en utilisant la chaleur résiduelle encore présente, de soumettre à un traitement de normalisation la zone du joint, c'est-à-dire la structure fondue incluant la structure des zones touchées par la chaleur qui sont adjacentes des deux côtés. L'invention concerne un ensemble de brûleurs permettant de mettre en oeuvre cette méthode, et caractérisé par une répartition symétrique de brûleurs (18, 11, 20, 21) par rapport à un plan central longitudinal (22) et à un plan central transversal (14), deux brûleurs étant destinés et conçus pour le traitement des flancs de tête dans la zone de la structure fondue et, dans chaque cas, quatre brûleurs étant destinés et conçus pour le traitement du pied de rail (2) dans la région des zones touchées par la chaleur. Le traitement thermique est mis en oeuvre en faisant appel à des vitesses de refroidissement différentes pour la tête de rail (7) et pour le pied de rail (2) de manière à obtenir une structure ayant une surface de roulement offrant une meilleure résistance à l'usure et un pied de rail (2) ayant une ductilité accrue.

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