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Flash-butt welding method for rail steel

A technology of flash butt welding and rail steel, which is applied to the joints of rails, rails, tracks, etc., can solve problems such as aggravation, hardness reduction, and uneven wear of softened parts, so as to reduce uneven wear, reduce surface damage, and reduce unevenness. The effect of uniform wear

Inactive Publication Date: 2012-09-12
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

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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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Abstract

The invention relates to a welding method. The method is for subjecting a pair of track rail steels to flash- butt welding, which is provided with a preheating step for causing a current to flow for a predetermined time period in a state in which the welding surfaces of the pair of the track rail steels are forced into contact with each other, and heating the vicinity of the welding surfaces by means of resistance heating, a previous flash step for partially generating flash on the welding surfaces, and heating the welding surfaces by means of the resistance heating and electric-arc heating of the flash, and a later flash step for further generating the flash on the entire welding surfaces, and uniformly applying heat to the entire welding surfaces by means of the resistance heating and electric-arc heating of the flash, wherein the later flash speed in the later flash step is 2.1-2.8 mm / sec inclusive.

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 Applications(China)
IPC IPC(8): B23K11/04B23K11/16E01B11/50E01B29/44B23K101/26B23K103/04B23K11/24C22C38/00C22C38/04
CPCB23K11/04B23K2101/26E01B29/42
Inventor 才田健二福地弘堤泰伸
Owner NIPPON STEEL CORP
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