Welding Heat Processing Technology and System Design of Ineellect ualization Moving Gas Pressure Welding for CWR Rail

Abstract

Based on the programmable logic controller of Delta’s human machine interface (HMI), electronic control systems, a high-pressured power pump and crimp system, temperature control systems, automatic swing fire systems, and a control system for post-processing heat welding was developed to manage a set of process parameters intelligently for railway gas pressure welding and post-processing. A description of the system composition, the setting of welding parameters, programming of the system design for automatic control of the post-processing welding heat technology (including a macro and microstructure organization characteristic analysis of welded seam), the welded joint degree of hardness, and the quenching temperature critical point determination, are included in this study. The welding data record and a historical trend curve drawing method are utilized. Test results indicated that the U75V and U71Mn hot rolling rail welded joint areas cooled to 500℃, and when normalizing heating was restarted it reached up to 800℃. It was determined that to achieve optimal heat quenching processing, the quenching temperature should be below 580℃. Quenching time should be greater than 180 s to complete the organization transformation and ensure railhead surface hardness and the matching of parent material. Both heating temperature and the time of post-processing heat welding provide the theoretical basis to ensure the rail joint welding quality and post-processing heat stability effect.