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Solder for exothermal soldering of railway track joint, igniting agent and soldering method

A technology of railway track and welding method, which is applied in the direction of aluminothermic welding equipment, welding medium, welding equipment, etc., which can solve the problems of air holes, large tendency of hot embrittlement of joints, oxidative ablation, etc., so as to prevent explosion and reduce thermal cracking Tendency, the effect of improving toughness

Inactive Publication Date: 2012-07-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of exothermic welding of existing steels, such as high thermal embrittlement tendency of joints, generation of pores and oxidative ablation, and provides a solder and its igniter for exothermic welding of railway track joints

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0009] Specific embodiment 1: This embodiment is a kind of solder used for exothermic welding of railway track joints, which consists of 40-50 parts of iron oxide powder, 30-50 parts of iron powder, 10-15 parts of industrial aluminum powder, It is prepared by mixing 1-2 parts of molybdenum powder, 1-4 parts of titanium powder, 1-2 parts of ferrosilicon powder, 4-5 parts of fluorspar powder, 1-2 parts of marble powder and 0.1-0.5 parts of lanthanum-cerium alloy powder.

[0010] The mass percentage of silicon in the ferrosilicon powder described in this embodiment is 0.15% to 0.35%, and the balance is iron; the mass percentage of cerium in the lanthanum-cerium alloy powder described in this embodiment is 62% to 0.35%. 68%, the balance is lanthanum.

[0011] The mass percentage of iron oxide in the iron oxide powder described in this embodiment is ≥99%, and the particle size is 60 mesh to 270 mesh; the mass percentage of iron in the iron powder described in this embodiment is ≥99...

specific Embodiment approach 2

[0012] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: a kind of igniter used for exothermic welding solder of railway track joints consists of 42-48 parts by weight of iron oxide powder, 35-45 parts Iron powder, 11-14 parts of industrial aluminum powder, 1.2-1.8 parts of molybdenum powder, 2-3 parts of titanium powder, 1.2-1.8 parts of ferrosilicon powder, 4.2-4.8 parts of fluorspar powder, 1.2-1.8 parts of marble powder and 0.2-0.4 It is made by mixing lanthanum-cerium alloy powder. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Specific embodiment three: this embodiment is a kind of igniter that is used for exothermic welding solder of railway track joint by weight and number ratio by 10~20 parts of magnesium powder, 40~60 parts of iron oxide powder, 10~15 parts of industrial Aluminum powder, 5-10 parts of potassium permanganate powder and 5-10 parts of red phosphorus powder are mixed.

[0014] The mass percentage of magnesium in the magnesium powder described in this embodiment is ≥ 98%, and the particle size is 150 mesh to 200 mesh; the mass percentage of iron oxide in the iron oxide powder described in the embodiment is ≥ 99%, and the particle size is It is 60 mesh to 270 mesh; the mass percentage of aluminum in the industrial aluminum powder described in this embodiment is ≥99%, and the particle size is 60 mesh to 100 mesh; the particle size of potassium permanganate powder described in this embodiment is 150 mesh to 200 mesh, the particle size of the red phosphorus powder described in thi...

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Abstract

The invention discloses a solder for exothermal soldering of a railway track joint, an igniting agent and a soldering method, and relates to a solder, an igniting agent and a soldering method. The invention solves the problems about high hot brittleness of the joint, production of pores and oxidative ablation in the conventional exothermal soldering of the steel. The solder for the exothermal soldering of the railway track joint is formed by mixing ferric oxide powder, iron powder, industrial aluminum powder, molybdenum powder, titanium powder, ferrosilicon powder, fluorite powder, marble powder and lanthanum-cerium alloy powder; the igniting agent for the solder is formed by mixing magnesium powder, ferric oxide powder, industrial aluminum powder, potassium permanganate powder and red phosphorus powder; and the welding method comprises the following steps of: weighing the solder for the exothermal soldering of the railway track joint and the igniting agent for the solder in a mass ratio of (78-82): 1, soldering by adopting an exothermal soldering method, and thus finishing soldering of the railway track joint. The invention mainly relates to the solder for the exothermal soldering of the railway track joint, the igniting agent for the solder and the soldering method.

Description

technical field [0001] The invention relates to a solder, an ignition agent and a welding method thereof. Background technique [0002] Rails are the most important components of track structures. With the rapid development of high-speed railways, seamless lines have been widely used. Since seamless lines eliminate the weak link of rail joints, the track structure maintains continuity along the extension direction, greatly reducing the wheel-rail The dynamic effect improves the load status of the track structure and rolling stock, and prolongs the service life of the equipment. And the practice shows that the welding quality of the rail determines whether the seamless line can play its due effect. In the field welding of seamless lines, exothermic welding has the advantages of simple equipment, fast and convenient and low cost, no shortening of the rail during the welding process, high joint straightness, convenient construction, and easy mastery by workers, and has been w...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K35/34B23K35/36B23K23/00
Inventor 李卓然王征征徐晓龙刘羽冯吉才
Owner HARBIN INST OF TECH
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