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Bainitic steel and pearlitic steel thermit welding material and welding technology

A technology of pearlitic steel and thermite welding, which is applied in the field of welding materials for thermite welding and welding of thermite welding materials, can solve problems such as abnormal structure, poor performance of welded joints, hidden dangers of train operation, etc., and achieve The effect of homogenizing the chemical composition of the interface and simplifying the welding process

Active Publication Date: 2016-03-23
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when pearlitic flux is used for welding, due to the diffusion of carbon elements to the side of the bainite rail with high alloy content, abnormal structures will be produced, resulting in poor performance of the welded joints, which do not meet the technical standards, and bring safety hazards to the operation of the train

Method used

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  • Bainitic steel and pearlitic steel thermit welding material and welding technology
  • Bainitic steel and pearlitic steel thermit welding material and welding technology
  • Bainitic steel and pearlitic steel thermit welding material and welding technology

Examples

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Effect test

Embodiment 1

[0049] Example 1 A kind of aluminothermic welding material of bainitic steel and pearlitic steel

[0050] The composition of the aluminothermic welding material of the bainitic steel and the pearlitic steel is:

[0051] Aluminum powder 18.8%, iron oxide 68.8%, ferromanganese 2.79%, ferrochrome 0.62%, ferrosilicon 1.12%, ferromolybdenum 0.5%. The rest is iron powder.

[0052] Wherein, the particle size of the aluminum powder is 10-80 mesh; the particle size of the iron oxide is 30-60 mesh; the particle size of the iron powder is 10-80 mesh; the particle size of the ferrochrome is 10-60 mesh; The particle size of the ferromolybdenum is 10-60 mesh.

[0053] Mix the above components evenly to obtain the aluminothermic welding material of bainitic steel and pearlitic steel.

[0054] In this embodiment, the total amount of alloy additions is 5.03%.

Embodiment 2

[0055] Example 2 A kind of aluminothermic welding material of bainitic steel and pearlitic steel

[0056] The composition of the aluminothermic welding material of the bainitic steel and the pearlitic steel is:

[0057] Aluminum powder 18.8%, iron oxide 68.8%, ferromanganese 2.7%, ferrochrome 0.6%, ferrosilicon 1.2%, ferromolybdenum 0.6%. The rest is iron powder.

[0058] Wherein, the particle size of the aluminum powder is 10-80 mesh; the particle size of the iron oxide is 30-60 mesh; the particle size of the iron powder is 10-80 mesh; the particle size of the ferrochrome is 10-60 mesh; The particle size of the ferromolybdenum is 10-60 mesh.

[0059] Mix the above components evenly to obtain the aluminothermic welding material of bainitic steel and pearlitic steel.

[0060] In this embodiment, the total content of alloy additives is 5.1%.

Embodiment 3

[0061] Example 3 A kind of aluminothermic welding material of bainitic steel and pearlitic steel

[0062] The composition of the aluminothermic welding material of the bainitic steel and the pearlitic steel is:

[0063] Aluminum powder 18.8%, iron oxide 68.8%, ferromanganese 2.8%, ferrochrome 0.7%, ferrosilicon 1.1%, ferromolybdenum 0.4%. The rest is iron powder.

[0064] Wherein, the particle size of the aluminum powder is 10-80 mesh; the particle size of the iron oxide is 30-60 mesh; the particle size of the iron powder is 10-80 mesh; the particle size of the ferrochrome is 10-60 mesh; The particle size of the ferromolybdenum is 10-60 mesh.

[0065] Mix the above components evenly to obtain the aluminothermic welding material of bainitic steel and pearlitic steel.

[0066] In this embodiment, the total content of alloy additives is 5.0%.

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Abstract

The invention provides a bainitic steel and pearlitic steel thermit welding material and application of the bainitic steel and pearlitic steel thermit welding material to bainitic steel and pearlitic steel welding. The bainitic steel and pearlitic steel thermit welding material comprises, by weight percentage, 18%-19% of aluminum powder, 68%-69% of iron oxide, 2.7%-2.8% of ferromanganese, 0.6%-0.7% of ferrochromium, 1.1%-1.2% of ferrosilicon, 0.4%-0.6% of ferromolybdenum and the balance iron powder. The invention further provides a steel rail thermite welding technology characterized by utilization of the bainitic steel and pearlitic steel thermit welding material. When a pearlitic steel rail and a bainitic steel rail are welded by the use of the bainitic steel and pearlitic steel thermit welding material and the welding technology, the chemical composition of weld metal is similar to the chemical composition of bainitic steel, the microstructure of the weld metal is carbide-free bainite, no cracks or abnormal structures exist, a welded joint has good mechanical properties, and the hardness, the static bending performance and other performance meet the existing industrial standards.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to an aluminothermic welding material used for welding bainite steel and pearlitic steel, and a welding process using the aluminothermic welding material. Background technique [0002] Heavy-haul railway transportation is widely valued by railways all over the world because of its large transportation capacity, high efficiency and low transportation cost, especially in some countries with vast territory, rich resources, and large proportion of bulk cargo such as coal and ore. Heavy-haul transportation technology has been recognized internationally as the direction of railway freight development and has become one of the important trends in the development of world railways. In order to meet the needs of heavy-duty transportation, my country's railways continue to increase the load capacity of vehicles. In 2006, there were about 450,000 vehicles with a load of 60 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K23/00B23K101/26B23K103/04
CPCB23K23/00B23K35/3053B23K2101/26B23K2103/04
Inventor 崔成林丁韦邹定强杨艳玲
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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