Automatic Rail Arc Welding for Strong, Repeatable Rail Joints
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Solution Overview
Problem
Current rail welding technologies, such as thermit welding and manual forced forming arc welding, fail to meet the high-quality and high-performance requirements of modern railways due to limitations in joint strength, repeatability, and adaptability.
Innovation Solution
The development of an automatic rail arc welding process using a self-shielded flux-cored wire and a narrow-gap side wall fusion welding method, with specific welding gun movement trajectories and parameters tailored to different rail sections (bottom, waist, and head) to ensure consistent and high-quality welds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thermit welding is used for in-situ rail welding, then the welding can be performed in the field, but the welded joint performance is low and the joint is the weakest procedure in the jointless track
Solution Approach 1:
The patent changes the welding method from thermit welding to automatic arc welding with flux-cored wire, modifying the fundamental welding parameters (heat source, filler material, protection method) to achieve both field applicability and high joint strength. The automatic welding process with controlled parameters eliminates the low performance of thermit welding while maintaining portability.
2Strength
If manual forced forming arc welding is used, then the welded joint performance is high, but the quality is greatly affected by human factors and it is only widely used in Japan
Solution Approach 1:
The patent replaces the manual mechanical welding process with an automatic welding system. The automatic welding gun system eliminates human factor influence by using automated control for wire feeding, gun movement, and welding parameters, thereby ensuring consistent quality while maintaining high joint performance.
Solution Approach 2:
The flux-cored wire provides self-shielding through its own flux coating that generates protective gas and slag during welding, eliminating the need for external protective gas equipment. This self-service capability enables automatic welding to be performed in field conditions without complex gas supply systems.
3Device complexity
If self-shielded flux-cored wire is used for automatic rail arc welding, then the welding gun is simple and light, but the technical parameters have low adaptability and the welding technology has poor repeatability
Solution Approach 1:
The patent implements dynamic adjustment capabilities in the automatic welding system, allowing real-time modification of welding parameters (current, voltage, wire feeding speed, gun movement speed) to adapt to different rail sections and welding positions. This dynamic control system provides the needed versatility while maintaining simple equipment structure.
Solution Approach 2:
The patent divides the rail welding into different sections (bottom, waist, head) with specific welding trajectories and parameters for each section. This segmentation allows the welding process to be optimized for each specific area, improving adaptability and repeatability without complicating the overall equipment design.
4Productivity
If existing manual arc welding technology is used for automatic rail arc welding, then the process can be continuous, but it is difficult to replace welding wires and the technology cannot meet automatic welding requirements
Solution Approach 1:
The patent employs a continuous wire feeding system where the flux-cored wire is fed continuously through the welding gun without interruption. This eliminates the need to stop and replace individual welding electrodes, enabling continuous welding operation and significantly improving productivity while simplifying the operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables high-repeatability and reliable welding with improved mechanical properties, capable of meeting the mechanical testing requirements of modern railways, while reducing operational complexity and increasing adaptability to varying rail shapes.
Implementation Method 1
manual forced forming arc welding
Implementation Method 2
automatic rail arc welding technology
Implementation Method 3
a self-shielded flux-cored wire is required
Data Source
AI summary
A rail welding method and device are provided. The method includes: welding a bottom of rail, wherein welding is repeatedly performed along a first swing trajectory in a lengthwise direction of a weld seam, from one end of the bottom of rail to the other end of the bottom of rail; welding a waist of rail, wherein welding is repeatedly performed in the lengthwise direction of the weld seam along a second swing trajectory, from one end of the waist of rail, and the second swing trajectory is divided into two regions for respective welding in a width direction of the weld seam; and welding a head of rail, wherein welding is performed in the lengthwise direction of the weld seam along the first swing trajectory, between one end of the head of rail and the other end of the head of rail.