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A kind of rail thermite flux and its welding method

An aluminothermic flux and rail technology, applied in aluminothermic welding equipment, rails, welding media, etc., can solve problems such as hardness matching of weld metals

Active Publication Date: 2017-01-25
CHINA RAILWAYS CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the molten steel metal structure generated by the aluminothermic reaction is pearlite structure, so that the hardness of the joint metal is less than 310HB, and the strength is less than 800Mpa. The hardness of the weld metal cannot match the current high-strength steel rail.

Method used

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  • A kind of rail thermite flux and its welding method
  • A kind of rail thermite flux and its welding method
  • A kind of rail thermite flux and its welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Effect contrast of the thermite flux of the present invention and traditional flux

[0036] In percent by weight, aluminum powder 18.6%, iron oxide 67.3%, Cr 1.5%, Ni0.32%, Mo 0.15%, and the balance are cast iron grains, uniformly mixed to obtain the thermite flux of the present invention; The thermite flux is welded according to the welding method of the present invention, and the obtained weld metal structure is bainite structure, as shown in the attached Figure 4 As shown, the weld metal of this organization has good comprehensive properties of strength and toughness;

[0037] Using traditional flux, its composition is: aluminum powder, iron oxide, cast iron particles and a small amount of iron alloy are evenly mixed, and welded according to the welding method of the present invention, the weld metal structure obtained is pearlite structure, its strength and hardness Limited and cannot match high-strength steel rails. Although the strength of the joint metal can b...

Embodiment 2

[0039] Performance comparison of the weld metal obtained by the thermite flux of the present invention

[0040] By weight percent, aluminum powder 18.6%, iron oxide 67.3%, Cr 1.5%, Ni0.32%, Mo 0.15%, and the balance are cast iron grains, uniformly mixed to obtain the thermite flux of the present invention, and the present invention The above-mentioned thermite flux is welded according to the welding method of the present invention, and the weld metal obtained is according to Image 6 The way of processing, testing its performance, test results are shown in Table 2;

[0041] Evenly mix aluminum powder, iron oxide, cast iron particles and a small amount of iron alloy to obtain traditional flux, which is welded according to the welding method described in the present invention, and the obtained weld metal is obtained according to Image 6 The way of processing, testing its performance, test results are shown in Table 2;

[0042] The tensile strength contrast of the weld metal t...

Embodiment 3

[0048] Screening test of the content ratio of each component in the thermite flux of the present invention

[0049] Groups 1 to 3 are the composition ratios of the thermite fluxes of the present invention, and groups 4 to 6 are comparative examples.

[0050] Table 3 The performance comparison of the weld metal obtained by the content ratio of each component of the thermite flux according to the present invention

[0051]

[0052] Table 3 shows that Groups 1 to 3 are the composition ratios of the thermite flux described in the present invention, and the weld metal structure obtained by it is a bainite structure, as shown in the attached Figure 4 As shown, the weld metal with this organizational structure has good comprehensive properties of strength and toughness; the aluminothermic flux adopts the composition ratio shown in group 4, and the weld metal obtained by it will cause cracks due to the abnormal chemical composition of the weld, as shown in attached figure 1 sho...

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Abstract

The invention provides steel rail aluminothermy welding flux which is used for a railway steel rail and is of a bainite structure and high in strength and a welding method of the steel rail aluminothermy welding flux. The steel rail aluminothermy welding flux comprises, by weight, 18.4% to 18.8% of aluminum powder, 67.0% to 67.6% of ferric oxide, 1.4% to 1.6% of Cr, 0.31% to 0.33% of Ni, 0.14% to 0.16% of Mo and the balance cast iron particles. By the adoption of the steel rail aluminothermy welding flux, a weld metal structure is bainite, the hardness of the welding flux can be matched with that of a bainite steel rail base metal, and meanwhile the requirements for field construction use can be completely met.

Description

technical field [0001] The invention belongs to the field of thermite flux, and in particular relates to a thermite flux with bainite structure and high strength for railway rails and a welding method thereof. Background technique [0002] Heavy-duty transportation technology has been recognized internationally as the direction of railway freight development. In order to meet the needs of heavy-duty transportation, my country's railways are constantly increasing the vehicle load. In 2006, there were about 450,000 vehicles with a load of 60 tons and above in my country, accounting for 85.7% of the total number of vehicles. Among them, there were more than 20,000 vehicles with an axle load of 23 tons and a load of 70 tons, and vehicles with an axle load of 25 tons and a load of 80 tons. There are more than 8,400 vehicles, which are of great significance for improving the railway transportation capacity, alleviating the contradiction of transportation tension, realizing the expa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K23/00
CPCB23K23/00B23K35/286B23K35/3601B23K35/362B23K2101/26B23K2103/04
Inventor 高松福崔成林杨艳玲迟俊杰丁韦
Owner CHINA RAILWAYS CORPORATION
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