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Method for regulating and controlling microscopic structure of steel rail welding joint

A technology of welded joints and microstructures, which is applied in heat treatment process control, furnaces, heat treatment equipment, etc., can solve the problems of few invention patents, and achieve the effect of convenient operation, simple process flow and remarkable effect.

Inactive Publication Date: 2021-01-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there are few technical documents and invention patents on the research on the suppression process of intergranular cementite precipitation in rail welded joints

Method used

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  • Method for regulating and controlling microscopic structure of steel rail welding joint
  • Method for regulating and controlling microscopic structure of steel rail welding joint
  • Method for regulating and controlling microscopic structure of steel rail welding joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The experimental material of this embodiment is the 68kg rail profile and rail head hardened (heat-treated) pearlitic rail specified in the AS 1085.1: Railway track materials, Part 1: Steelrails standard, and the measured carbon content of the physical chemical composition of the rail is 0.8% by weight. Carry out 5 parallel experiments, the specific experimental process includes the following steps: use GAAS80 / 580 rail fixed flash welding welding machine to carry out welding experiments, use accelerated cooling device 2 (cooling surface 4 is 13mm away from the rail waist surface, and the spray angle is 45 °), using Water mist (pressure 2.5bar) is used as the cooling medium, and the first-stage accelerated cooling is performed on the rail waist of the welded joint to be cooled obtained by flash welding (the cooling rate at the center of the rail waist weld is 19-35°C / s), While cooling, use an infrared thermometer to measure the temperature at the center of the rail waist ...

Embodiment 2

[0067] The experimental material of this embodiment is the 68kg rail profile and rail head hardened (heat-treated) pearlitic rail specified in the AS 1085.1: Railway track materials, Part 1: Steelrails standard, and the measured carbon content of the physical chemical composition of the rail is 0.8% by weight. Carry out 5 parallel experiments, and the specific experimental process includes the following steps: adopt the rail mobile flash welding machine to carry out the welding experiment, use the accelerated cooling device 2 (cooling surface 4 is 13 mm away from the rail waist surface, and the spray angle is 45 °), and use water mist ( The pressure is 2.5bar) as the cooling medium, and the first stage of accelerated cooling is performed on the rail waist of the welded joint to be cooled obtained by flash welding (the cooling rate at the center of the rail waist weld is 19-35°C / s). At the same time, use an infrared thermometer to measure the temperature of the center of the rai...

Embodiment 3

[0075] The experimental materials in this example are the 60E1 rail profile specified in the BS EN 13674-1: Railway applications–Track–Rail, Part 1: Vignole railway rails 46kg / m and above standard, the R260 hot-rolled pearlitic rail, and the rail solid chemistry Composition The measured carbon content was 0.6% by weight. Carry out 5 parallel experiments, the specific experimental process includes the following steps: adopt the rail mobile flash welding machine to carry out the welding experiment, use the accelerated cooling device 2 (cooling surface 4 is 15mm away from the rail waist surface, and the spray angle is 40°), use water mist ( The pressure is 3.5bar) as the cooling medium, and the first stage of accelerated cooling is performed on the rail waist of the welded joint to be cooled obtained by flash welding (the cooling rate at the center of the rail waist weld is 19-35°C / s). At the same time, an infrared thermometer is used to measure the temperature of the center of t...

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Abstract

The invention relates to the field of steel rail welding, and discloses a method for regulating and controlling a microscopic structure of a steel rail welding joint. The method comprises the following steps that 1, an accelerated cooling device is used, water mist is adopted as a cooling medium, a to-be-cooled joint rail waist part obtained through flash welding is subjected to first-stage accelerated cooling, and meanwhile, the temperature of the center position of a welding seam of the joint rail waist is measured and monitored; 2, when the temperature is reduced to a first preset temperature, compressed air is adopted as a cooling medium to carry out second-stage accelerated cooling on the joint rail waist part, and meanwhile, the temperature of the center position of the welding seamof the joint rail waist is measured and continuously monitored; and 3, when the temperature is reduced to a second preset temperature, accelerated cooling is stopped, and then the joint is placed in air to be naturally cooled to the room temperature. According to the method, waste heat of the steel rail welding joint is utilized, so that abnormal structures such as intergranular cementite in a pearlite steel rail flash welding joint can be effectively ensured to be normal, and meanwhile, the hardness, the static bending performance and the like of the joint can be ensured to meet the use requirements.

Description

technical field [0001] The invention relates to the field of rail welding, in particular to a method for regulating the microstructure of rail joints. Background technique [0002] With the rapid development of seamless track technology in passenger transport, freight transport, high-speed and heavy-duty railway construction worldwide, the quality of rail joints has attracted more and more attention from relevant departments. As the direct carrier of train operation, the quality and reliability of railway lines is the key to the safe operation of trains. The rail flash welded joint is the weak link of the whole line, its quality can directly affect the safety of the railway, and the microstructure of the rail joint directly determines the performance of the joint. [0003] At present, the mainstream steel rails at home and abroad are pearlitic steel rails. All the current standards applicable to pearlitic rail flash welding and enterprise technical conditions have specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D11/00
CPCC21D9/505C21D11/005
Inventor 陆鑫李大东王若愚邓健
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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