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Corrosion-resistant aluminothermic welding flux suitable for U68CuCr steel rail and welding method thereof

An aluminothermic flux and corrosion-resistant technology, which is applied in the direction of aluminothermic welding equipment, welding equipment, welding media, etc., can solve the problems of deepening welding head corrosion, endangering driving safety, and poor corrosion resistance, so as to prolong service life and improve Corrosion resistance, the effect of simple welding operation method

Active Publication Date: 2022-01-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, we found that in the actual service process of U68CuCr rail, the corrosion resistance of the welded joint formed by the existing conventional thermite flux is poor, and selective corrosion is prone to occur in the atmospheric corrosive environment, and defects such as surface pits are formed so that the corrosive medium Aggregation further deepens the corrosion of the welding head, which may cause serious consequences such as fracture and seriously endanger driving safety

Method used

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  • Corrosion-resistant aluminothermic welding flux suitable for U68CuCr steel rail and welding method thereof
  • Corrosion-resistant aluminothermic welding flux suitable for U68CuCr steel rail and welding method thereof
  • Corrosion-resistant aluminothermic welding flux suitable for U68CuCr steel rail and welding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of anti-corrosion thermite flux, the formula is as follows in dry state according to weight percentage: aluminum powder 17.4%, iron oxide 63.3%, cast iron grain 9.6%, Mn 0.62%, Cu 0.21%, Cr 0.25%, Nb 0.13% , Iron scraps 8.49%. Among them, the particle size of aluminum powder is 40-60 mesh, the particle size of iron oxide is 18-60 mesh, the particle size of cast iron shot is 10-30 mesh, the particle size of Mn is 10-80 mesh, the particle size of Cu is 10-80 mesh, and the particle size of Cr is 10-80 mesh. The particle size of Nb is 10-80 mesh, and the particle size of Nb is 10-80 mesh. The above raw materials are uniformly mixed at room temperature according to the stoichiometric ratio, and then sealed and stored.

[0030] In addition, an existing conventional thermite flux has been prepared, and the formula in dry state is as follows: 17% of aluminum powder, 65% of iron oxide, 9% of cast iron particles, 0.4% of Si, 0.8% of Mn, iron shavings 7.8%. The powder ra...

Embodiment 2

[0046] A kind of anti-corrosion thermite flux, the formula is as follows in dry state according to weight percentage: aluminum powder 17.2%, iron oxide 63.1%, cast iron shot 9.2%, Mn 0.55%, Cu 0.16%, Cr 0.22%, Nb 0.11% , Iron scraps 9.46%. The above raw materials are uniformly mixed at room temperature according to the stoichiometric ratio, and then sealed and stored. The selected powder raw materials all meet the particle size requirements.

[0047] With reference to the method of Example 1, two sections of U68CuCr steel rails were welded with the above-mentioned corrosion-resistant thermite flux, and the joints were sampled for corrosion resistance. The results showed that its corrosion resistance and other properties were similar to those of Example 1 samples. See Table 4-6.

[0048] Table 4 Different corrosion sheets Experimental results comparison table

[0049]

[0050] Table 5 Comparison table of electrochemical experiment results in different weld center region...

Embodiment 3

[0055] A kind of anti-corrosion thermite flux, the formula in dry state is as follows according to the weight percentage: aluminum powder 17.5%, iron oxide 63.6%, cast iron grain 9.6%, Mn 0.65%, Cu 0.24%, Cr 0.28%, Nb 0.15% , Iron scraps 7.98%. The above raw materials are uniformly mixed at room temperature according to the stoichiometric ratio, and then sealed and stored. The selected powder raw materials all meet the particle size requirements.

[0056] With reference to the method of Example 1, two sections of U68CuCr rails were welded with the above-mentioned corrosion-resistant thermite flux, and the joints were sampled for corrosion resistance. The results showed that its corrosion resistance and other properties were similar to those of Examples 1 and 2. The experimental results are shown in Table 7-9.

[0057] Table 7 Different corrosion sheets Experimental results comparison table

[0058]

[0059] Table 8 Comparison table of electrochemical experiment results...

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Abstract

The invention relates to a corrosion-resistant aluminothermic welding flux suitable for a U68CuCr steel rail and a welding method thereof. The aluminothermic welding flux comprises, by weight, 17.0%-17.6% of aluminum powder, 62.4%-64.0% of iron oxide, 9%-10% of cast iron pills with the C content being 3%-3.5%, 0.5%-0.7% of Mn, 0.15%-0.25% of Cu, 0.2%-0.3% of Cr, 0.10%-0.16% of Nb and the balance iron scraps with the C content being smaller than or equal to 0.1%. By improving the formula and the welding process, the corrosion resistance of a welding joint of the U68CuCr steel rail is improved by about 40%, selective corrosion of the part is effectively prevented, the service life of the steel rail is greatly prolonged, and the running safety of a train is guaranteed. The corrosion resistance of an aluminothermic welding joint is improved, meanwhile, the strength and hardness of the aluminothermic welding joint are not affected, the aluminothermic welding joint even can be matched with a U68CuCr steel rail base material, the whole welding operation is simple, and the using requirement of site construction is completely met.

Description

technical field [0001] The invention relates to the technical field of rail welding, in particular to a corrosion-resistant thermite flux suitable for U68CuCr rails and a welding method thereof. Background technique [0002] Metal corrosion widely exists in various mechanical equipment in the industrial field, and is one of the main causes of material loss and equipment failure. After the metal material is corroded, its strength will be greatly reduced, which will affect the safety and reliability of the metal structure, and even seriously endanger the safety of people and property. In the field of railway transportation, the corrosion of steel rails in industrial atmospheric environment and marine atmospheric environment is very serious, which poses a threat to the safe operation of railways. Therefore, the rail R&D and production departments have developed corrosion-resistant rails (such as U68CuCr rails), and the railway sector has also developed corrosion-resistant mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K23/00
CPCB23K35/3093B23K23/00Y02P10/20
Inventor 欧阳珉路
Owner 武汉钢铁有限公司
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