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Wet-seal box sand for rapid thermit welding

An aluminothermic welding and wet sealing technology, which is applied in the field of aluminothermic welding of rails, can solve problems such as welding failures and threats to the safety of construction personnel, and achieve the effects of saving costs, saving scarce resources, and reducing costs

Inactive Publication Date: 2019-07-23
施密特钢轨技术(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small gap between the sand mold and the rail, high-temperature molten steel may seep out of the gap, resulting in welding failure and threatening the safety of construction personnel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is the wet sealing sand used for rapid thermite welding, and its composition includes 10 parts of bentonite, 180 parts of quartz sand, and 5 parts of water.

[0024] The bentonite is calcium-based sodium bentonite after activation treatment and adding sodium ions, which can effectively enhance the ion exchange adsorption of bentonite.

[0025] The AFS fineness of quartz sand is 40-65. Choose quartz sand with a fineness in the range of 40-65, so that its particle size is suitable for gap filling. At the same time, in the range of fineness 40-65, the particle diameters are different, so that the gaps between large sand particles can be filled by small particles, so that the size of quartz sand particles is scattered and the density of quartz sand is improved.

[0026] Quartz sand has high refractoriness and can be used as aluminothermic welding refractory material. However, because quartz sand has high hardness, poor viscosity, and no binding force betwe...

Embodiment 2

[0032] This embodiment is wet sealing sand for fast thermite welding. Its components include 10 parts of bentonite, 180 parts of quartz sand, and 15 parts of water. The bentonite is calcium-based sodium bentonite that has been activated and added with sodium ions. The AFS fineness of quartz sand is 40-65. This embodiment is combined into an embodiment with lower viscosity and higher moisture content. It is used in areas with high temperature and large evaporation, and is suitable for use in the conditions of small gaps and less amount of caulking.

Embodiment 3

[0034] This embodiment is wet-sealing sand for rapid thermite welding. Its components include 35 parts of bentonite, 120 parts of quartz sand, and 5 parts of water. The bentonite is calcium-based sodium bentonite that has been activated and added with sodium ions. The AFS fineness of quartz sand is 40-65. This embodiment is combined into an embodiment with higher viscosity and lower moisture content, which is used in areas with low temperature and less evaporation, and is suitable for use in the case of large gaps and a large amount of caulking.

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Abstract

The invention discloses wet-seal box sand for rapid thermit welding. The wet-seal box sand comprises 10-35 parts of bentonite, 120-180 parts of quartz sand and 5-15 parts of water. Activating treatment is carried out on bentonite, and sodium ions are added to form calcium-based sodium modified bentonite. The quartz sand and the calcium-based sodium modified bentonite are uniformly mixed by a sandmixer, and are wrapped around the quartz sand particles by utilizing the physical adsorbability of the bentonite; then uniformly adding the water for wet mixing, greatly increasing the viscosity and ion exchange adsorbability of the bentonite after water absorption, and enabling the combination of the bentonite and the quartz sand particles to be more tight. The wet-seal box sand has relatively high viscosity, refractoriness and filling capacity, and can effectively fill the edge gap of the thermit welding sand mold in rapid thermit welding, so that the rapid sealing can be realized, the leakage of high-temperature molten steel on the contact surface of the sand mold and the steel rail can be avoided, and the safe and smooth thermit welding can be ensured.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of aluminothermic welding of rails, in particular to a kind of wet sealing sand used for fast aluminothermic welding. [0003] 【Background technique】 [0004] At the end of the nineteenth century, with the development of the metallurgical industry and the chemical industry, people invented thermite welding to weld rails. In the early 1960s, my country began to use aluminothermic welding to weld tracks on railways. [0005] Rail aluminothermic welding has the following characteristics: [0006] 1. The aluminothermic welding of rails has its own heat source, which produces a chemical reaction through the aluminothermic flux to produce high-temperature molten steel. Therefore, the equipment is simple, the operation is convenient and fast, and a small number of personnel can perform welding operations, which is especially suitable for on-site and field construction. [0007] 2. The geometric position o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K23/00
CPCB23K23/00
Inventor 刘天顺曹宏禄
Owner 施密特钢轨技术(昆山)有限公司
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