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Method of mobile flash welding of 60kg/mr260 hot-rolled rail

A rail and displacement technology, applied in welding equipment, welding/welding/cutting items, resistance welding equipment, etc., can solve the problems of poor static bending performance of 60kg/mR260 hot-rolled rail joints, and achieve good promotion and application prospects. Stable welding quality and less internal defects

Active Publication Date: 2020-10-27
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

[0004] The purpose of the present invention is to provide a method for moving flash welding of 60kg / m R260 hot-rolled rails to solve the problem of poor static bending performance of 60kg / m R260 hot-rolled rail joints welded by the existing welding process

Method used

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  • Method of mobile flash welding of 60kg/mr260 hot-rolled rail
  • Method of mobile flash welding of 60kg/mr260 hot-rolled rail
  • Method of mobile flash welding of 60kg/mr260 hot-rolled rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 adopts the inventive method to weld 60kg / m R260 hot-rolled steel rail

[0029] 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 1.7MJ, the burning displacement is 1.2mm, and the duration is 23.8s. The welding heat input of the second stage flash is 6.3MJ, the displacement is 11.6mm, and the duration is 61.8s. The welding heat input of the third stage of accelerated burning is 0.4MJ, the displacement is 11.7mm, and the duration is 22.5s. The welding heat input of the fourth stage upsetting is 0.3MJ, the displacement is 15.7mm, the live upsetting time is 1.1s, and the duration is 2.7s. The holding pressure of the fifth stage is 26.8t, and the duration is 11.8s. The total heat input in the welding process is 8.7MJ, and the total welding duration is 122.6s. The specific parameters are listed in the table below:

[0030] Table 1 welding parameters

[0031]

[00...

Embodiment 2

[0033] Embodiment 2 adopts the inventive method to weld 60kg / m R260 hot-rolled steel rail

[0034] 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 1.7MJ, the burning displacement is 2.1mm, and the duration is 23.9s. The welding heat input of the second stage flash is 5.5MJ, the displacement is 12.7mm, and the duration is 53.8s. The welding heat input of the third stage of accelerated burning is 0.4MJ, the displacement is 11.7mm, and the duration is 22.5s. The welding heat input of the fourth stage upsetting is 0.3MJ, the displacement is 13.9mm, the live upsetting time is 1.1s, and the duration is 9.3s. The holding pressure of the fifth stage is 26.9t, and the duration is 11.7s. The total heat input in the welding process is 7.9MJ, and the total welding duration is 121.2s. The specific parameters are listed in the table below:

[0035] Table 2 welding parameters

[0036]

[00...

Embodiment 3

[0038] Embodiment 3 adopts the inventive method to weld 60kg / m R260 hot-rolled steel rail

[0039]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 1.6MJ, the burning displacement is 1.7mm, and the duration is 23.9s. The welding heat input of the second stage flash is 5.8MJ, the displacement is 12.9mm, and the duration is 55.5s. The welding heat input of the third stage of accelerated burning is 0.4MJ, the displacement is 11.3mm, and the duration is 22.5s. The welding heat input of the fourth stage upsetting is 0.3MJ, the displacement is 17.3mm, the live upsetting time is 1.1s, and the duration is 3.0s. The holding pressure of the fifth stage is 28.6t, and the duration is 12.0s. The total heat input in the welding process is 8.1MJ, and the total welding duration is 116.9s. The specific parameters are listed in the table below:

[0040] Table 3 welding parameters

[0041]

[004...

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Abstract

The invention relates to a mobile flash welding method for a 60 kg / m R260 hot-rolled steel rail, and belongs to the technical field of steel rail welding. In order to solve the problem that static bending performance of a 60 kg / m R260 hot-rolled steel rail joint welded by an existing welding process is not good, the technical scheme adopted by the invention provides the mobile flash welding methodfor the 60 kg / m R260 hot-rolled steel rail. The method comprises five stages of flash flattening, flashing, accelerated burning, top-forging and pressure-maintaining, wherein total heat input amountfor welding is 6.5-9.3 MJ, total duration for welding is 108.4-131.8s, and top-forging amount for welding is 12.4-18.6 mm. The method can be adopted to successfully perform mobile flash welding on the60 kg / m R260 hot-rolled steel rail, and is stable in welding quality; the static bending performance of the steel rail joint is greatly improved in comparison with an existing welding method, so thatinternal defects are fewer, and a popularization and application prospect is better.

Description

technical field [0001] The invention relates to a method for moving flash welding of 60kg / m R260 hot-rolled rails, and belongs to the technical field of rail welding. Background technique [0002] Among the existing inspection standards for rail welded joints at home and abroad, the static bending test is an inspection method for the overall performance of rail joints that is specified in all standards. For rail joints of different rail types, the standards of various countries have different regulations on the minimum load and minimum deflection. Among them, the Russian STO RZD 1.08.002:2009 standard has the highest quality requirements, requiring the minimum load and deflection of the joint to be no less than 2100kN and 30mm respectively (65kg / m rail, rail head under pressure), the minimum load when converted into 60kg / m rail head under pressure is 1907kN and 30mm; EN 14587-2:2009 standard requirements are second, when 60kg / m rail head is under pressure The minimum load i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/04B23K103/04
CPCB23K11/002B23K11/04
Inventor 陆鑫李大东王若愚邓健
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP