Technological method for controlling 'white block' tissues in bainite steel rail flash welding joint

A process method, bainite technology, applied in the field of rail welding, can solve the problems of large size and large number of "white blocks", achieve the effects of stable welding quality, improved service performance, and improved appearance

Active Publication Date: 2017-09-29
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a process method for controlling the "white block" structure in the flash welding joint of bainite rail, aiming at solving the "white blo

Method used

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  • Technological method for controlling 'white block' tissues in bainite steel rail flash welding joint
  • Technological method for controlling 'white block' tissues in bainite steel rail flash welding joint
  • Technological method for controlling 'white block' tissues in bainite steel rail flash welding joint

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] In the process of welding the bainite rail by using the rail flash butt welding equipment by the method of the present invention, the flash flat stage, the pulsation stage, the accelerated firing stage, the upsetting stage and the pressure holding stage are sequentially controlled as follows:

[0050] The welding heat input in the control flash flat stage is 2.2MJ, and the duration is 22s;

[0051] The welding heat input in the control pulsation stage is 4.9MJ, the rail consumption is 2.5mm, and the duration is 53.9s;

[0052] Control the welding heat input in the accelerated firing stage to 0.6MJ, the rail consumption to 8.2mm, and the duration to be 20.5s;

[0053] The welding heat input of the control upsetting stage is 0.1MJ, the upsetting amount is 14.1mm, the live upsetting time is 0.3s, and the duration is 8.1s;

[0054] The holding pressure of the control holding stage is 27.5T, and the duration is 12.7s;

[0055] Control the total welding heat input to 7...

Example Embodiment

[0056] Example 2

[0057] In the process of welding the bainite rail by using the rail flash butt welding equipment by the method of the present invention, the flash flat stage, the pulsation stage, the accelerated firing stage, the upsetting stage and the pressure holding stage are sequentially controlled as follows:

[0058] The welding heat input in the control flash flat stage is 2.3MJ, and the duration is 23s;

[0059] The welding heat input in the control pulsation stage is 5.1MJ, the rail consumption is 3.0mm, and the duration is 57.9s;

[0060] Control the welding heat input in the accelerated firing stage to 0.7MJ, the rail consumption to 8.5mm, and the duration to be 20.5s;

[0061] The welding heat input in the control upsetting stage is 0.1MJ, the upsetting amount is 15.3mm, the live upsetting time is 0.5s, and the duration is 7.8s;

[0062] The holding pressure of the control holding stage is 26.7T, and the duration is 11s;

[0063] Control the total welding heat input to 8.2...

Example Embodiment

[0064] Example 3

[0065] In the process of welding the bainite rail by using the rail flash butt welding equipment by the method of the present invention, the flash flat stage, the pulsation stage, the accelerated firing stage, the upsetting stage and the pressure holding stage are sequentially controlled as follows:

[0066] The welding heat input in the control flash flat stage is 2.3MJ, and the duration is 22.5s;

[0067] The welding heat input in the control pulsation stage is 5.1MJ, the rail consumption is 2.8mm, and the duration is 52s;

[0068] Control the welding heat input in the accelerated firing stage to 0.5MJ, the rail consumption to 7.9mm, and the duration to be 23.5s;

[0069] The welding heat input of the control upsetting stage is 0.1MJ, the upsetting amount is 14.9mm, the live upsetting time is 0.4s, and the duration is 8.1s;

[0070] The holding pressure of the control holding stage is 27.5T, and the duration is 12.9s;

[0071] Control the total welding heat input to 8...

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Abstract

The invention belongs to the technical field of steel rail welding, particularly discloses a technological method for controlling 'white block' tissues in a bainite steel rail flash welding joint and aims to solve the problems that 'white blocks' in microstructures of a flash welding joint welded by an existing bainite steel rail flash welding technology are large in number and size. According to the technological method, in the process that steel rail flash butt welding equipment is adopted to weld a bainite steel rail, the flashing and flattening stage, the pulsation stage, the accelerated burning stage, the upsetting stage and the pressure maintaining stage are controlled in sequence. The technological method is adopted to perform corresponding control in the bainite steel rail flash welding process, the number of 'white block' tissues near a weld joint can be lowered to the minimum, the sizes of the 'white block' tissues are reduced, the appearance of the steel rail is improved, therefore welding quality is stable, the mechanical property of the welding joint is guaranteed, the service performance of the bainite steel rail flash welding joint is improved, and safety of railway operation is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of rail welding, and in particular relates to a process method for controlling the "white block" structure in a bainite rail flash welding joint. Background technique [0002] Bainitic steel rail has been a research hotspot in the world in recent decades. It is expected to replace the traditional pearlitic steel rail due to its high toughness, wear resistance and long service life. It is widely used in railway turnout components and small rails for heavy-duty lines. Radius curve segment. At this stage, rail seamlessness has become an inevitable trend. As an important process in the seamless link of rails, the quality of rail welding is directly related to the service life of railway lines and even the safety of traffic. During the rail service process, due to the influence of welding quality and the complexity of the actual operating conditions of the line, most of the fractures of the welded long rails oc...

Claims

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Application Information

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IPC IPC(8): B23K11/04B23K11/16
CPCB23K11/04B23K11/16
Inventor 徐飞翔李大东王若愚邓健白威陆鑫
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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