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Steel rail welding technology

A welding process and rail technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve problems such as difficulty in achieving high-quality weld requirements

Inactive Publication Date: 2004-03-17
HUDONG ZHONGHUA SHIPBUILDINGGROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the special cross-sectional shape of the rail in this case, it is difficult to achieve high-quality welds with the above-mentioned welding method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] (1) Select high-carbon manganese steel rail welding electrodes;

[0020] (2) Adjust the assembly gap of the rail to 20mm, fix it with a bow-shaped horse, and equip the bottom of the rail with a 12×100×280 copper pad;

[0021] (3) The welding method of single-side welding of copper lining by manual arc welding is adopted;

[0022] (4) Welding position: aligned with the right-angle groove, and the rail is placed on a steel frame with a height of 450-500mm;

[0023] (5) The temperature measurement points are all 100mm away from the center of the weld; the preheating temperature is ≥300°C, the interlayer temperature is ≥200°C, the post-welding heating temperature is ≥600°C, and then kept warm and cooled slowly;

[0024] (6) Operate according to the welding operation specification: Φ3.2mm electrode is used for bottom welding, the welding current is 110-120A, and Φ4mm electrode is used for the rest of the layers, and the welding current is 160-170A; when welding, each layer ...

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PUM

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Abstract

The present invention relates to steel rail welding and is especially the welding process of steel rail for portal crane. The welding process includes selecting welding rod for high carbon manganese steel rail; regulating the assembly interval between two rails to 15-25 mm, fixing with arched fixture and backing with copper cushion; welding single side of the copper cushion via manual arc welding and right-angle bevel butt welding. The welding process has preheating temperature not lower than 300 deg.c, interlayer temperature not lower than 200 deg.c and after-welding heating temperature not lower than 600 deg.c with the temperature being measured in the point away from the welding seam center by 100 mm. All the welding seams are inspected via magnetic powder flaw detection for welding crack and other flaws.

Description

Technical field: [0001] The invention relates to a rail welding process, in particular to a rail welding process on the main girder of a gantry crane. Background technique: [0002] There are the following types of rail welding in China: [0003] (1) Gas pressure welding of railway seamless line rail [U71Mn75Kg / m ultra-heavy rail small mobile gas pressure welding Liu Jianwei 1990]; [0004] (2) Panzhihua Iron and Steel's domestic first secondary heating and upsetting welding method adopts normalizing after welding to improve the distribution state and improve the comprehensive mechanical properties of the joint [PD3 rail online welding process research]; [0005] (3) Flash contact welding method of rails [Research on continuous flash welding process of 50Kg / m rails, Wang Deyu 1992]; [0006] (4), new thermite welding method [About the new aluminotherm welding method / translated by Li Huichun on the draft aluminothermic welding operation standard for Goldmitus rail (SKV meth...

Claims

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Application Information

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IPC IPC(8): B23K31/02
Inventor 毛信抗朱建华呙林锋岑越
Owner HUDONG ZHONGHUA SHIPBUILDINGGROUP
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