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Method for inhibiting harmful microstructure of steel rail welded joint

A technology for welded joints and microstructures, which is applied in the field of rail welding, can solve the problems of few invention patents, etc., and achieve the effects 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 inhibiting harmful microstructure of steel rail welded joint
  • Method for inhibiting harmful microstructure of steel rail welded joint
  • Method for inhibiting harmful microstructure of steel rail welded joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The measured carbon content of the physical chemical composition of the steel rail used in this embodiment is 0.8% by weight. GAAS80 / 580 rail fixed flash welding machine was used for welding experiments. Use the accelerated cooling device 2 (cooling surface 4 is 13mm away from the rail waist surface of the rail welded joint), and use water mist (the absolute pressure of the water mist is 2.5bar) as the cooling medium to cool the welded joint of the rail obtained by flash welding. Accelerated cooling, and at the same time use an infrared thermometer to measure the temperature of the center of the welded joint of the rail and continuously monitor the temperature (control the cooling rate of the center of the welded joint of the rail to 19-35°C / s), When the temperature drops to 1050°C, the control system automatically shuts off the cooling medium, immediately stops the accelerated cooling, and then places the rail welded joints in the air to cool naturally to room temperat...

Embodiment 2

[0062] The measured carbon content of the physical chemical composition of the steel rail used in this embodiment is 0.8% by weight. Welding experiments were carried out with a rail moving flash welding machine. Use the accelerated cooling device 2 (cooling surface 4 is 13mm away from the rail waist surface of the rail welded joint), and use water mist (the absolute pressure of the water mist is 2.5bar) as the cooling medium to cool the welded joint of the rail obtained by flash welding. Accelerated cooling, and at the same time use an infrared thermometer to measure the temperature of the center of the welded joint of the rail and continuously monitor the temperature (control the cooling rate of the center of the welded joint of the rail to 19-35°C / s), When the temperature drops to 1050°C, the control system automatically shuts down the cooling medium, stops the accelerated cooling immediately, and then cools the rail welded joints in the air to room temperature naturally. A ...

Embodiment 3

[0071]The measured carbon content of the physical chemical composition of the steel rail used in this embodiment is 0.6% by weight. Welding experiments were carried out with a rail mobile flash welding machine, using accelerated cooling device 2 (the cooling surface 4 is 15mm away from the rail waist surface of the rail welding joint), and water mist (the absolute pressure of water mist is 3.5bar) was used as the cooling medium. The obtained rail waist of the welded joint of the rail to be cooled is accelerated to cool, and an infrared thermometer is used to measure the temperature of the central position of the welded joint of the rail at the same time, and the temperature is continuously monitored (controlling the central position of the welded joint of the rail to The cooling rate is 19-35°C / s), when the temperature drops to 950°C, the control system automatically shuts off the cooling medium, immediately stops the accelerated cooling, and then places the welded joints of th...

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Abstract

The invention relates to the technical field of steel rail welding, and discloses a method for inhibiting a harmful microstructure of a steel rail welded joint. The method comprises the following steps that firstly, accelerated cooling is performed on a rail web part of the to-be-cooled the steel rail welded joint obtained by flash welding by using an accelerated cooling device (2) and adopting water mist as a cooling medium, and meanwhile, the temperature of the central position of a rail web welding seam of the steel rail welded joint is measured and continuously monitored; and secondly, accelerated cooling is stopped when the temperature is dropped to preset temperature, and then the steel rail welded joint is placed in the air to be naturally cooled to room temperature. According to the method, the waste heat of the steel rail welded joint is utilized, the joint does not need to be reheated, the normality of abnormal structures such as intergranular cementite in the steel rail welded joint can be effectively ensured, and meanwhile it is guaranteed that the hardness, static bending and other properties of the joint meet the use requirements.

Description

technical field [0001] The invention relates to the technical field of rail welding, in particular to a method for suppressing harmful microstructures of rail welded 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 c...

Claims

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Application Information

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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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