Rail track friction welding method

Abstract

The invention discloses a rail track friction welding method. The method comprises the following steps: 1, pre-weld preparation: carrying out pretreatment on the end faces of two sections of rails tobe welded according to the track friction welding requirements, and aligning to form a track friction pair; 2, initial friction: translating the second rail, and enabling the first rail to get close to a track clamp; forming a friction surface after the friction face of the first rail is in contact with the friction face of the second rail, making plastic deformation and mechanical excavation phenomena occur on the friction surface, and gradually increasing the heating power of the friction surface; 3, friction transition: with the progress of a friction process, gradually enlarging the sealing of the friction surface by means of plastic metal with good contact; 4, stable friction: extruding the metal of a high temperature plastic deformation layer from the friction surface to form a flashedge under the action of track motion and friction, and shortening the rails in the axial direction; 5, upset welding: returning the first rail and the second rail for aligning, rapidly applying upset pressure, and using weld zone metal to form rail track friction welding joints.

Description

technical field [0001] The invention belongs to the technical field of railway rail welding, and in particular relates to a rail friction welding method. Background technique [0002] With the extensive promotion and application of my country's high-speed rail technology at home and abroad, as well as the construction of high-speed rail networks under various extreme weather conditions, higher requirements are put forward for the seamless line rails that carry high-speed trains to achieve seamless The most critical and important part of the road is rail welding. The welding method used plays a decisive role in the safety and reliability of rail welding, energy saving and environmental protection (environmental pollution), quality and efficiency. [0003] Existing rail welding methods include flash welding, gas pressure welding, thermite welding and arc welding. The rail arc welding method has the characteristics of high labor intensity, low efficiency, strong arc light, seri...

AI Technical Summary

Problems solved by technology

Rail aluminothermic welded joints have the characteristics of low strength, unstable quality, high rail breaking rate and poor comprehensive performance due to the as-cast structure.

The gas pressure welding method of rails has very strict requirements on the treatment of the joint section. Due to the influence of many human and environmental factors, the quality of the joint fluctuates greatly and is difficult to control.

It belongs to the external heating method, the thermal efficiency is low, the welding time is about 6 minutes, and the weld seam and heat-affected zone are about 100mm wider

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