A flame heating method for rail cladding alloy strip

Abstract

The invention discloses a flame heating method of steel rail cladding alloy belts. The method is characterized by including the steps of: a) placing a steel rail cladding machine on a steel rail, andarranging a flame head above the clad alloy belt; b) with a gas mixture including liquefied gas and oxygen as a heating gas source, pressure ratio of the liquefied gas to oxygen being 1:2.5, directlymixing the liquefied gas and oxygen on the flame head; c) allowing the clad alloy belt for 2-180 sec, and moving the flame head in the X-axis direction at constant speed to heat the alloy belt, wherein a basis is that the heat affected zone of the steel rail after heating is tempered sorbite or (tempered sorbite + tempered troostite) or tempered troostite. The method is free of controlling the temperature reduction rate of the cladding heat affected zone; by means of the flame heating treatment to martensite generated in the heat affected zone of the steel rail after the alloy belt cladding operation, the performance of structure of the heat affected zone after the cladding operation to the steel rail in site can satisfy the use demands of the steel rail.

Description

technical field [0001] The invention relates to the technical field of rail cladding, in particular to a flame heating method for a rail cladding alloy strip. Background technique [0002] The track circuit is an electrical circuit composed of two rails of the railway line as conductors, and the signal power supply and receiving equipment are connected with lead wires. In sections where trains rarely pass through for a long time, such as shunting lines, cargo lines, and special lines, the rail surface is severely oxidized and rusted. On, indicating that the track circuit has lost the function of checking the occupancy status of the track section. This phenomenon is called poor track circuit shunting. Cladding a layer of anti-rust and wear-resistant alloy belt on the rail head tread in the bad section of the track circuit, so that the wheel and the non-rust wear-resistant alloy belt can be effectively contacted, which can effectively eliminate the bad phenomenon of the trac...

AI Technical Summary

Problems solved by technology

[0008] The existing technology represented by the above-mentioned patent documents needs to control the cooling rate of the cladding heat-affected zone in the alloy cladding process of the rail, and has the following deficiencies: 1. On-site construction is restricted by equipment conditions, construction conditions, and technical conditions. The heating equipment is too large, the construction speed is slow, and the efficiency is low

2. Generator power is used for cladding site construction. If the power of the generator exceeds 40kw, the equipment is too heavy to be transported manually

The cladding moving speed is too slow, usually the cladding speed is 30-40m / h, and the section with poor branching is generally 60-100m / place, while the working time of the skylight is only 1h / day, and the construction of one bad branching section requires 2 -3 days, low construction efficiency and high cost

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