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Steel rail thermite welding system and method

A technology of aluminothermic welding and rail, which is applied in the field of wide-gap rail aluminothermic welding system, can solve the problems of limited gap width, low welding efficiency, multiple welding materials, etc., and achieve the goal of saving construction time, saving construction cost and low cost Effect

Inactive Publication Date: 2012-07-11
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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  • Description
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  • Application Information

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Problems solved by technology

[0005] Therefore, in the prior art, the width of the welded rail gap is limited, only 23 to 30 mm. When the welded rail gap exceeds 30 mm, a section of rail must be equipped to weld the two joints, which requires more welding materials. And welding efficiency is low

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  • Steel rail thermite welding system and method
  • Steel rail thermite welding system and method
  • Steel rail thermite welding system and method

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Embodiment Construction

[0035] The aluminothermic welding of rails casts the liquid metal generated by the aluminothermic reaction into a closed cavity formed by a sand mold consistent with the outer dimensions of the rails and partially preheated rails to be welded. After melting, crystallization, and cooling, the two sections of rails are welded together. into a whole. As shown in Figure 1, the welding process can be roughly divided into three steps: charging, pouring and solidification. The rail aluminothermic welding system used includes a sand mold, a crucible arranged above the sand mold, and a crucible installed in the crucible. of flux.

[0036] The flux contains various raw materials. In order to prepare the flux, various raw materials are weighed according to the formula, and then mixed uniformly by using a mixer, and the uniformly mixed flux is packaged.

[0037] In a specific embodiment, the various raw materials used to prepare the flux are as follows:

[0038] Iron oxide: formed by o...

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Abstract

The invention provides a steel rail thermite welding system, which comprises a sand mould, a crucible and fluxes, wherein the crucible is arranged above the sand mould, the fluxes are filled in the crucible, and the sand mould comprises a polyhedral body cast with molding sand. The body comprises a bottom die, a left side die and a right side die, the bottom die is made of refractory materials, and the left side die and the right side die are the same in structure and respectively comprise three risers, wherein two risers are positioned on the outer side of a rail base angle of base metal of a steel rail so that liquid steel can flow through the rail base angle to promote welding, and the other riser is positioned at a position close to the rail base angle in a triangular rail base area and is communicated with the inside of a cavity at the position of a rail head, so that solidifying contraction of liquid steel in the rail base angle area and a rail head area is simultaneously compensated. By the aid of the system, the steel rail can be welded without rail matching under the condition of a wide rail gap exceeding 30mm. The invention further provides a method for welding the steel rail by using the steel rail thermite welding system.

Description

technical field [0001] The invention relates to a rail aluminothermic welding system and method, in particular to a wide-gap rail aluminothermic welding system and method. Background technique [0002] The laying of seamless lines is an effective means to adapt to the development of heavy-duty railway transportation, reduce the impact of trains on the track, and prolong the service life of the track. The rail aluminothermic welding technology is one of the important welding technologies for seamless railway rail welding. Compared with other rail welding methods, the smoothness of the joint is better, which can effectively reduce the wheel-rail impact caused by the unevenness of the track. In addition, the rail aluminothermic welding method has the characteristics of simple equipment and convenient operation, and is especially suitable for short-term line maintenance operations under the high-density and large-capacity transportation mode of heavy-duty railways. Rail alumino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/04
Inventor 高松福崔成林杨艳玲迟俊杰王宝秀
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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