Welding wire and method thereby to perform gas welding repair operations on bell frogs and switch rails gas welding repair operation

Abstract

The invention discloses a welding wire and a method thereby to perform gas welding repair operations on bell frogs and switch rails gas welding repair operation. The welding wire comprises Fe, Ni, Cd and C, wherein the mass percentage contents of the C, the Ni and the Cd are respectively 0.48%-0.58%, 0-0.32% and 0.8%-1.08%. The method for the repair welding repair operation comprises the steps of: treating the surfaces of bell frogs, switch rails and steel rails with oxydizing flame and neutral flame; melting the welding wire with the neutral flame, putting the welding wire into a melting bath all the time, and adding a cushion under the welding area after completing repair welding repair; and adopting parallel grinding wheels of a grinder to smoothing and grinding the plane and then the two sides of the welding layer by adopting parallel the grinding wheels of a grinder. The metallurgical structure of the welding wire is exactly similar towith that of bainite alloy steel, and the welding wire can meet the domestic requirements for application and mechanical properties on bell frogs, switch rails and steel rails. By matching a bell frog and switch rail repair welding repair process, and guaranteeing railway traffic safety at the same time, the repair cost of relevant maintenance work can be reduced greatly, and the work efficiency can be increased while guaranteeing the railway train operation safety.

Description

technical field [0001] The invention relates to the field of welding repair and maintenance operations in railway lines, in particular to a welding wire and a method for using the welding wire to carry out gas welding and welding repair operations on Bell crossings and point rails. Background technique [0002] In recent years, my country's railway lines have undergone a large-scale line speed-up transformation. In order to increase the speed of train crossings and realize the overall speed-up of the line, the use of bell points and point rails in domestic railway lines has become increasingly widespread. Due to the high carbon content of the bainite alloy steel, the traditional welding process and the welding wire used in the traditional process cannot realize the welding repair of the bell branch and the point rail. As a result, the repair work of Bell's fork and switch rails had to be replaced by high-cost replacement of switch centers and switch rails. Moreover, the tra...

AI Technical Summary

Problems solved by technology

Due to the high carbon content of bainite alloy steel, the traditional welding process and the welding wire used in the traditional process cannot realize the welding repair of the bell branch and the point rail.

As a result, the repair work of Bell branch and switch rail had to be replaced by high-cost replacement of switch center and switch rail

Moreover, the traditional welding process has low efficiency and high cost, and it is easy to have pores and cracks in the welding process, and it is impossible to weld and repair the bell branch.

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