Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for movable flash welding of 75 kg/m hypereutectoid steel rail and pearlite steel rail, and steel rails

A pearlitic rail, hypereutectoid technology, applied in rails, welding power sources, welding equipment, etc., to achieve the effect of good stability, less internal defects, and good stability

Active Publication Date: 2017-01-18
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are no reports and literatures about the mobile flash welding of hypereutectoid rails and PG4 heat-treated rails

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for movable flash welding of 75 kg/m hypereutectoid steel rail and pearlite steel rail, and steel rails
  • Method for movable flash welding of 75 kg/m hypereutectoid steel rail and pearlite steel rail, and steel rails
  • Method for movable flash welding of 75 kg/m hypereutectoid steel rail and pearlite steel rail, and steel rails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment is used to illustrate the method and rail for moving flash welding of moving rail provided by the present invention

[0047] The 75kg / m PG5 hypereutectoid rail and PG4 heat-treated rail are welded by a mobile rail flash welding machine. The welding heat input in the flash flat stage is 2.5MJ, the displacement is 2.1mm, and the duration is 29s; the welding in the pulsating stage The heat input is 8.4MJ, the displacement is 10.2mm, and the duration is 81.2s; the welding heat input in the accelerated firing stage is 0.4MJ, the displacement is 11.6mm, and the duration is 26.1s; the welding heat input in the upsetting stage The displacement is 0.1MJ, the displacement is 16.9mm, and the live upsetting time is 0.4s; the holding pressure in the holding stage is 28.6t, and the duration is 15.5s. The total heat input of welding is 11.4MJ, the duration is 152.2s, the burning displacement of the rail is 40.8mm, and the welding upset is 16.9mm. The welding result is...

Embodiment 2

[0059] This embodiment is used to illustrate the method and rail for moving flash welding of moving rail provided by the present invention

[0060] The 75kg / m PG5 hypereutectoid rail and PG4 heat-treated rail were welded by a mobile rail flash welding machine. The welding heat input in the flash flat stage was 2.6MJ, the displacement was 2mm, and the duration was 29s; the welding heat in the pulsating stage The input is 8.1MJ, the displacement is 10mm, and the duration is 80s; the welding heat input in the accelerated sintering stage is 0.3MJ, the displacement is 12mm, and the duration is 27s; the welding heat input in the upsetting stage is 0.08MJ, The displacement is 17.5mm, and the live upsetting time is 0.45s; the holding pressure in the holding stage is 30t, and the duration is 15s. The total heat input of welding is 11.08MJ, the duration is 151.45s, the burning displacement of the rail is 41.5mm, and the welding upsetting amount is 17.5mm. The short circuit impedance is...

Embodiment 3

[0065] This embodiment is used to illustrate the method and rail for moving flash welding of moving rail provided by the present invention

[0066] The 75kg / m PG5 hypereutectoid rail and PG4 heat-treated rail are welded by a mobile rail flash welding machine. The welding heat input in the flash flat stage is 2.7MJ, the displacement is 2.5mm, and the duration is 30s; the welding in the pulsating stage The heat input is 8.6MJ, the displacement is 10.5mm, and the duration is 82s; the welding heat input in the accelerated firing stage is 0.5MJ, the displacement is 10mm, and the duration is 25s; the welding heat input in the upsetting stage is 0.07 MJ, the displacement is 16.5mm, and the live upsetting time is 0.5s; the holding pressure in the holding stage is 28t, and the duration is 16s. The total heat input of welding is 11.87MJ, the duration is 153.5s, the burning displacement of the rail is 39.5mm, and the welding upsetting amount is 16.5mm. The short circuit impedance is 111...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
Login to View More

Abstract

The invention relate to the field of welding of steel rails, and discloses a method for movable flash welding of a 75 kg / m hypereutectoid steel rail and a pearlite steel rail, and the steel rails obtained through welding according to the method. The method comprises the steps of flash flattening, pulsing, accelerated burning, upsetting and pressure maintaining, and is characterized in that the total heat input for welding in the movable flash welding process is controlled to 10-13 MJ, the total duration for welding is 143-162 s, and the upsetting amount for welding is 15.5-18.5 mm. By adoption of the method, movable flash welding of the 75 kg / m hypereutectoid steel rail and the pearlite steel rail can be achieved, internal defects of joints of dissimilar steel rails are few, and the welding quality is stable; and the joints of the dissimilar steel rails can be checked continuously through 15 splash welding joint drop hammers, and the stability is good.

Description

technical field [0001] The invention relates to the field of rail welding, in particular to a method for performing mobile flash welding on a 75kg / m hypereutectoid rail and a pearlite rail and a rail obtained by welding the method. Background technique [0002] Hypereutectoid steel rail is a new type of steel rail developed in recent years. The carbon content of hypereutectoid steel rail is generally in the range of 0.90-1.0% by weight, and its microstructure is intergranular secondary cementite + pearlite. The mixed structure is the top steel rail with the highest strength (1350MPa) and hardness (400HB-420HB) in the world. The structure of pearlitic steel rail is pearlite, and the representative pearlitic steel rail is PG4 heat-treated steel rail. PG4 heat-treated steel rail (also known as U78CrV, referred to as PG4 steel rail) has a carbon content in the range of 0.72-0.82% by weight, a microstructure of pearlite structure, a strength equivalent to that of a hypereutectoi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/04B23K11/25B23K31/12B23K101/26B23K103/04
CPCB23K11/04B23K11/253B23K31/125B23K2101/26B23K2103/04
Inventor 李大东王若愚白威邓健陆鑫徐飞翔
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com