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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 block" in the microstructure of the flash welding joint formed by the welding of the existing bainite rail welding technology Problems with large numbers and large sizes

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

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Effect test

Embodiment 1

[0049] Through the method of the present invention, during the welding process of the bainite rail by the rail flash butt welding equipment, the following control is performed on the flash flat stage, the pulsation stage, the accelerated burning stage, the upsetting stage and the pressure holding stage in sequence:

[0050] Control the welding heat input in the flashing stage to 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 burning stage to 0.6MJ, the rail consumption to 8.2mm, and the duration to 20.5s;

[0053] Control the welding heat input in the upsetting stage to 0.1MJ, the upsetting amount to 14.1mm, the live upsetting time to 0.3s, and the duration to 8.1s;

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

[0055] The total welding heat input is co...

Embodiment 2

[0057] Through the method of the present invention, during the welding process of the bainite rail by the rail flash butt welding equipment, the following control is performed on the flash flat stage, the pulsation stage, the accelerated burning stage, the upsetting stage and the pressure holding stage in sequence:

[0058] Control the welding heat input in the flashing stage to 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 burning stage to 0.7MJ, the rail consumption to 8.5mm, and the duration to 20.5s;

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

[0062] Control the holding pressure in the holding stage to 26.7T, and the duration is 11s;

[0063] The total welding heat input is cont...

Embodiment 3

[0065] Through the method of the present invention, during the welding process of the bainite rail by the rail flash butt welding equipment, the following control is performed on the flash flat stage, the pulsation stage, the accelerated burning stage, the upsetting stage and the pressure holding stage in sequence:

[0066] Control the welding heat input in the flashing stage to 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 burning stage to 0.5MJ, the rail consumption to 7.9mm, and the duration to 23.5s;

[0069] Control the welding heat input in the upsetting stage to 0.1MJ, the upsetting amount to 14.9mm, the live upsetting time to 0.4s, and the duration to 8.1s;

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

[0071] The total welding heat input is co...

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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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