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60kg/m R260 hot-rolled rail moving flash welding method

A rail and welding process technology, applied in welding equipment, resistance welding equipment, metal processing equipment, etc., can solve problems such as bulging, uneven total width of heat-affected zone, and large difference between the maximum and minimum widths, etc. Achieve the effect of fewer internal defects, improved welding quality, and stable welding quality

Active Publication Date: 2018-11-27
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

[0003] At present, both at home and abroad, the rail waist clamping method is used for rail clamping and conduction, and the pulse flash welding process is used for welding. The total width of the heat-affected zone of the welded 60kg / m R260 hot-rolled rail joint is not uniform, and the joint rail waist The phenomenon of "bulging belly" often occurs at the place, the total width of the heat-affected zone is too large, and the difference between the maximum and minimum width of the heat-affected zone is large, which seriously affects the mechanical properties of the rail

Method used

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  • 60kg/m R260 hot-rolled rail moving flash welding method
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  • 60kg/m R260 hot-rolled rail moving flash welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] When the 60kg / m R260 hot-rolled rail is welded by a mobile rail flash welding machine, the welding heat input of the first stage flash flat is 1.9MJ, the burning displacement is 0.7mm, and the duration is 19.9s. The welding heat input of the second stage flash is 1.1MJ, the displacement is 10.3mm, and the duration is 52.3s. The welding heat input of the third stage of accelerated burning is 0.6MJ, the displacement is 13.4mm, and the duration is 32.9s. The welding heat input of the fourth stage upsetting is 0.2MJ, the displacement is 15.6mm, the live upsetting time is 0.6s, and the duration is 3.7s. The holding pressure of the fifth stage is 30.3t, and the duration is 12.9s. In the welding process, the total heat input is 3.9MJ, the displacement is 40.0mm, and the total welding duration is controlled to 118s, so as to achieve the purpose of controlling the width of the heat-affected zone of the joint and the quality of the joint. The specific data are listed in Table 1...

Embodiment 2

[0026] When the 60kg / m R260 hot-rolled rail is welded by a mobile rail flash welding machine, the welding heat input of the first stage flash flat is 1.9MJ, the burning displacement is 0.7mm, and the duration is 19.8s. The welding heat input of the second stage flash is 1.1MJ, the displacement is 10.4mm, and the duration is 53.6s. The welding heat input of the third stage of accelerated burning is 0.6MJ, the displacement is 13.5mm, and the duration is 32.8s. The welding heat input of the fourth stage upsetting is 0.2MJ, the displacement is 15.7mm, the live upsetting time is 0.9s, and the duration is 2.3s. The holding pressure of the fifth stage is 30.4t, and the duration is 13.0s. In the welding process, the total heat input is 3.8MJ, the displacement is 40.6mm, and the total welding duration is controlled to 119s, so as to achieve the purpose of controlling the width of the heat-affected zone of the joint and the quality of the joint. The specific data are listed in Table 2...

Embodiment 3

[0031] When the 60kg / m R260 hot-rolled rail is welded by a mobile rail flash welding machine, the welding heat input of the first stage flash flat is 1.9MJ, the burning displacement is 0.7mm, and the duration is 19.9s. The welding heat input of the second stage flash is 1.5MJ, the displacement is 10.0mm, and the duration is 59.6s. The welding heat input of the third stage of accelerated burning is 0.6MJ, the displacement is 13.2mm, and the duration is 32.5s. The welding heat input of the fourth stage upsetting is 0.2MJ, the displacement is 15.8mm, the live upsetting time is 1.0s, and the duration is 2.3s. The holding pressure of the fifth stage is 29.5t, and the duration is 12.9s. During the welding process, the total heat input is 4.2MJ, the displacement is 39.7mm, and the total welding duration is controlled to 124s to achieve the purpose of controlling the width of the heat-affected zone of the joint and the quality of the joint. The specific data are listed in Table 3. ...

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Abstract

The invention discloses a 60 kg / m R260 hot-rolled rail moving flash welding method, which comprises five stages of flash, flash, accelerated firing, upset and holding pressure. The total heat input during welding is 3.0-4.8 MJ, the total welding duration is 110-135s, and the welding upset is 12.4-16.7 mm. The invention improves the welding quality of the rail by controlling the total welding heatinput, the total welding time and the upset forging amount in the moving flash welding process, and controlling the welding heat input and the duration time of each of the five stages of flash, flash,accelerated firing, upset forging and holding pressure; 60 kg / m R260 hot-rolled rail can be successfully move for flash welding by that invention, The total width of HAZ of the whole 60kg / m R260 hot-rolled rail moving flash welding joint is controlled within 32mm, and the difference between the maximum and minimum of the total width is less than 8.2 mm. The internal defects of the rail joint areless, and the welding quality is stable.

Description

technical field [0001] The invention relates to the technical field of rail welding, in particular to a method for moving flash welding of 60kg / m R260 hot-rolled rails. Background technique [0002] The rail flash welding joint is composed of the welding zone and the adjacent rail base metal, and the welding zone is divided into the weld seam and the welding heat-affected zone (HAZ). According to the distance between each point on the base metal of the rail and the weld seam, the heat-affected zone can be roughly divided into three areas: coarse grained area, fine grained area and incomplete recrystallized area. The coarse-grained zone is also called the superheated zone, and the temperature in this zone is generally around 1200°C, which is close to the semi-melted zone. When the rail temperature exceeds 1100°C, the grains will be severely coarsened, and the longer the residence time, the wider the heating zone and the more serious the grains will be coarsened. It is easy ...

Claims

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Application Information

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IPC IPC(8): B23K11/04
CPCB23K11/04
Inventor 陆鑫李大东王若愚邓健
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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