Flash-butt welding method for rail steel

一种闪光对焊、钢轨钢的技术，应用在钢轨的接头、钢轨、轨道等方向，能够解决加重、硬度下降、软化部不均匀磨损等问题，达到不均匀磨损减少、表面损伤降低、降低不均匀磨损的效果

Inactive Publication Date: 2015-04-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the length of the rail in the softened portion is long and the hardness drops significantly, the uneven wear of the softened portion will increase due to the passing of the wheel on the head of the rail, and various problems will arise.

Method used

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  • Flash-butt welding method for rail steel
  • Flash-butt welding method for rail steel
  • Flash-butt welding method for rail steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0172] Hereinafter, the practicability and effects of the present invention will be further described using examples. In addition, the conditions used in the Example are an example for confirmation, and this invention is not limited to this example.

[0173] The AREA standard 136RE rail steel containing C: 0.85-1.2%, Si: 0.1-2.0%, Mn: 0.1-2.0% in mass %, and having a pearlite structure and a weight of 136 pounds per 1 m was used for flashing. Butt welding.

[0174] As the flash butt welding machine, a flash welding machine using an AC power source, a transformer capacity of 400kVA, and an upsetting load of 70kN was used. Regarding welding, in the combined flashing process and preheating process, the number of preheating times is 10, and the total time of the initial flashing process and the early flashing process is specified as 90 seconds, so that the post-flash speed and post-flash retention in the post-flash process Changes were performed as shown in Table 1.

[0175] Af...

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PUM

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Abstract

This welding method is a flash butt welding method of a pair of track rail steel pieces, having: a preheating process in which electric current is made to flow for a predetermined time in a state in which the welding surfaces of a pair of track rail steel pieces are forcibly brought into contact with each other, and vicinities of the welding surfaces are heated by resistance heating; a former flashing process in which flashing is partially caused in the welding surfaces, and the welding surfaces are heated by the resistance heating and arc heating of the flashing; and a latter flashing process in which the flashing is furthermore caused throughout the entire welding surfaces, and the entire welding surfaces are uniformly heated by the resistance heating and arc heating of the flashing, in which a latter flashing velocity is 2.1 mm / sec to 2.8 mm / sec in the latter flashing process.

Description

technical field [0001] The invention relates to a flash butt welding method for rail steel. In particular, the present invention relates to a rail steel flash butt welding method capable of reducing the heat-affected zone of the welded portion of the high-carbon hypereutectoid rail steel and reducing uneven wear and surface damage of the rail. [0002] This application claims priority based on Japanese Patent Application No. 2009-251071 for which it applied in Japan on October 30, 2009, and uses the content here. Background technique [0003] Flash butt welding has been widely used as a welding method for steel materials. Its features include advantages such as automation, high quality stability, and short welding time. [0004] use Figure 1A ~ Figure 1D The principle of the flash butt welding method will be described. [0005] First, if Figure 1A As shown, a voltage is applied from a power source 3 through an electrode 2 to a pair of rail steels 1A and 1B that are opp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/04B23K11/16E01B11/50E01B29/44B23K101/26B23K103/04B23K11/24C22C38/00C22C38/04
CPCE01B29/42B23K2201/26B23K11/04B23K2101/26
Inventor 才田健二福地弘堤泰伸
Owner NIPPON STEEL CORP
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