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High manganese steel frog and rail flash butt welding method

A welding method and high manganese steel technology, applied in the direction of rails, welding media, welding equipment, etc., can solve the problems of reducing the hardness of rails, difficulty in assembling rails, increasing manufacturing costs, etc., and achieve low cost, strong practicability, and convenient assembly Effect

Active Publication Date: 2009-07-08
CHINA RAILWAY BAOJI BRIDGE GRP
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  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are as follows: ①When the rail is heated to 200-600℃ and then welded, it will cause great difficulty in the assembly of the rail; The hardness of the rail is prone to saddle wear during use, ③ the use of specific media increases the manufacturing cost

Method used

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Effect test

Embodiment Construction

[0017] 1. The welding medium is the stainless steel material 0Cr18Ni12Mo2Ti of the national standard, and the chemical composition is (%):

[0018] C Si mn P S Cr Ni Mo Ti ≤0.08 ≤1.0 ≤2.0 ≤0.035 ≤0.03 16~19 11~14 1.8~2.5 0.4~0.7

[0019] 2. The main chemical composition of carbon steel rail (U75V) is (%):

[0020] C Si mn S P V Remark 0.74 0.59 0.90 0.019 0.023 0.046 retest value

[0021] 3. Welding process method:

[0022] ① Select the national standard 0Cr18Ni12Mo2Ti stainless steel bar as the connection medium, and then carry out forging heat treatment on the connection medium. After forging, the grain size of the stainless steel medium should not be less than grade 6, and add the connection medium after forging heat treatment to the shape of the rail;

[0023] ② After the carbon steel rail is cleaned of surface dirt such as oil and rust, it is docked with the connecting medium in the shape of the added ...

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Abstract

The invention relates to a method for flash butt welding a high manganese steel frog with a steel rail, comprising the following steps: 1. stainless steel materials of Guobiao marks are adopted as attachment medium, then forged hardening is carried out on the attachment medium which is processed into steel rail shape by a machine after the forged hardening; 2. the attachment medium which is processed into steel rail shape is bonded with the steel rail and then assembled into welded joints, flash butt welding is adopted to weld the attachment medium and the steel rail into a whole; 3. the attachment medium is cut to be 25-30mm long; 4. welding joints are maintained at the temperature of 390-410 DEG C for 180-210 minutes for destressing and then go through low temperature annealing; 5. the medium end is welded with the high manganese steel frog by the flash butt welding method. In the invention, stainless steel materials of Guobiao marks are adopted as attachment medium, so that the cost is low and the practicability is strong; the operation is more convenient as carbon steel rail can be welded with the medium directly by flash butt welding without being preheated; the low temperature annealing and distressing of the welding joints can hardly affect the hardness of the steel rails.

Description

technical field [0001] The invention relates to a high manganese steel frog and a rail flash butt welding method. Background technique [0002] There are two types of butt joints between high manganese steel frogs and rails: welding and bolting. Bolting causes rail gaps on the line, and when a train passes through the rail gaps, it will generate a huge impact, which not only shortens the service life of frogs, increases the workload of maintenance, but also affects the passing speed of trains. When domestic fixed high-manganese steel frogs are used for cross-section seamless lines, fishplates are generally used to freeze the frogs and rails, while foreign developed countries generally use welding methods to connect frogs and rails. [0003] The prior art closest to the present invention is the patent application for "High manganese steel frog and carbon steel rail plus medium flash welding method (CN1275463)" published on December 6, 2000, which uses a specific CrMnNiMo aus...

Claims

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Application Information

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IPC IPC(8): B23K11/04B23K35/22B23K101/26
Inventor 李松程亮张耀军高凡
Owner CHINA RAILWAY BAOJI BRIDGE GRP
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