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Heat treatment method for rail welded joints of dissimilar materials

A heat treatment method and technology for welding joints, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of many process steps, complex equipment, and increased difficulty, and achieve the effects of simple process equipment, improved quality, and easy operation

Active Publication Date: 2021-11-02
CHINA RAILWAY CONSTR HEAVY IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for welded joints of dissimilar material rails, the heat treatment process is more complicated and more difficult than that of the same material welded joints
The methods for welding heat treatment of dissimilar material rails published in the related art all have the problems of many process steps, complex equipment and high cost

Method used

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  • Heat treatment method for rail welded joints of dissimilar materials
  • Heat treatment method for rail welded joints of dissimilar materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 and figure 2 As shown, the first aspect of the present invention provides a heat treatment method for a rail welded joint 100 of dissimilar materials. The welded rail joint 100 of dissimilar materials includes a first connecting section 110 and a second connecting section 120 connected by welding. The first connecting section 110 The material of the second connecting section 120 is different; the heat treatment method for the rail weld joint 100 of different materials includes: marking the preheating area 160 and the heating area 150 on the rail welding joint 100 of the dissimilar material; heating the preheating area 160 until the preheating area 160 The temperature reaches the first preset temperature; the heating zone 150 is heated until the temperature of the heating zone 150 reaches the second preset temperature; the preheating zone 160 is kept warm until the temperature of the preheating zone 160 drops to the first temperature range.

[0049] Th...

Embodiment 2

[0052] Such as figure 1 As shown, on the basis of the first embodiment above, further, before marking the preheating area 160 and the heating area 150 on the rail welding joint 100 of different materials, it also includes: fixing the rail welding joint 100 of different materials, so that the rail welding joints of different materials 100, at least the preheating area 160 is suspended; under the preheating area 160, thermal insulation cotton is placed.

[0053] In this embodiment, before marking the preheating area 160 and the heating area 150 on the rail welding joint 100 of different materials, it also includes: fixing the welding joint 100 of the rails of different materials so that at least the preheating area 160 of the rail welding joint 100 of different materials is suspended, and also That is, at least the preheating area 160 of the welded rail joint 100 made of dissimilar materials is suspended; specifically, supports can be provided under the first connecting section ...

Embodiment 3

[0058] Such as figure 1 As shown, in any of the above embodiments, further, the preheating area 160 and the heating area 150 are heated by a neutral flame generated by a handheld flame heating device.

[0059] In this embodiment, the preheating area 160 and the heating area 150 are heated by a hand-held flame heating device, which has the advantages of simple process equipment, strong process applicability, and high flexibility. Moreover, due to the small size of the hand-held flame heating device , light in weight, easy to operate, therefore, can realize on-line or off-line production, that is, can implement the dissimilar material rail welding joint 100 heat treatment method provided by the present invention in the operation line of the factory, also can directly implement in the construction site of track The heat treatment method for the welded joint 100 of rails of different materials provided by the present invention has flexibility, and greatly improves the scope of app...

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Abstract

The invention provides a heat treatment method for rail welded joints made of dissimilar materials. The welded joints of rails made of dissimilar materials include a first connecting section and a second connecting section connected by welding. The materials of the first connecting section and the second connecting section are different; The joint heat treatment method includes: marking a preheating area and a heating area on the welded joint of rails of dissimilar materials; heating the preheating area until the temperature of the preheating area reaches a first preset temperature; heating the heating area until the temperature of the heating area reaches a second Preset temperature; heat preservation of the preheating area until the temperature of the preheating area drops to the first temperature range. The process of the heat treatment method for the welded joints of rails made of dissimilar materials consists of a preheating stage, a heating stage, and a heat preservation stage. By controlling the preheating stage, heating stage, and heat preservation stage respectively, the hardness of the welded rails made of different materials is uniform, and there is no martensite , Wei's tissue and other abnormal tissues, the performance meets the requirements.

Description

technical field [0001] The invention relates to the technical field of rail welding, in particular to a heat treatment method for welded joints of rails made of different materials. Background technique [0002] Turnout rail parts and frogs are the key components of turnout products. Due to various reasons such as customer's special requirements, processing and manufacturing costs, and service life, there are more and more designs for welding rails of different materials, and the welded joints of rails made of different materials are key components. The critical points and weak points of the rolling stock, when the rolling stock passes through the welded joint of the turnout, it will bear the rolling, extrusion and impact from the vehicle wheel, especially for the current high-speed heavy-duty rolling stock when passing the fork, this rolling, extrusion and impact It will be very serious, and it will easily cause "saddle" wear and early fatigue fracture of welded joints, res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/52C21D9/50
CPCC21D1/52C21D9/50C21D2221/00
Inventor 蒋荣国谭明明蒋红亮王甫洪
Owner CHINA RAILWAY CONSTR HEAVY IND