Research Of The Automatic Control System For The Rail Gas Pressure Welding

There are some problems such as low automatic level, too much man-made influences in the wide application of mobile gas pressure welding of rails in China. Those problems result in unstable rail welding quality and insecure rail transport. So it is significant to research the automatic control system of gas pressure welding.According to the process of the gas pressure welding, some research and design aiming at the hardware and software of the control system is carried out based on the old one. PLC is the control core of the gas pressure welding system. The pressure system, gas flux control system and heating system are optimized, as a result, three systems can work steadier. In order to control upsetting length, a new system about upsetting length control is added. Furthermore, the software and hardware for the setting, modification and adjusting of welding parameter are redesigned by the communication mode between the SCM and PLC. So the control of the welding parameter such as welding pressure, gas flux, upsetting length is realized, and the system has a high dynamic response rapid and a high control precision.Many welding procedure tests shows, by using this control system, man-made influence can be eliminated, welding quality can get steadier, welding operation can be simplified, labor's intensity can be reduced, welding speed can be increased, so the welding efficiency will be improved. What's more, this equipment has a compact structure, a light in weight, and a good reliability, and it is easy to carry, repair and operate, so it is fit for outdoor rail welding work.