With the rapid development of high-speed trains in China, the current market holds more than 4000 trains. During the new manufacturing process of rail vehicle steel castings, due to manufacturing defects such as pores, cracks, shrinkage porosity, shrinkage holes, critical dimension tolerances, deformation, processing errors, and other factors, it is easy to cause scrapping. After operating for a period of time, products entering the service operation period and products entering the maintenance period will also generate component dimension tolerances, deformation, and excessive wear, and even destructive defects such as cracks under extreme loads, It brings great hidden dangers to train operation and passenger safety.
Welding repair of rail vehicle steel castings is an effective means of repairing component defects. Through welding repair, failed components can regain their performance and dimensional requirements. Compared to newly manufactured welding, welding repair has a higher process complexity and increased technical difficulty. Poor welding repair processes are prone to product performance degradation and even lead to product scrapping. Therefore, standardizing the welding repair process flow and quality control points for steel castings of rail vehicles is the key to meeting performance and quality requirements, ensuring train operation and safe travel of passengers.
Welding repair of railway vehicle steel castings is a key and important process involving the safe operation of trains and the safety of passengers. By standardizing the welding repair process requirements and key quality control elements, this paper proposes recommended welding repair process parameters, providing a reference for the welding repair process and quality control methods for rail transit steel castings, ensuring that the repaired parts can meet the performance requirements again, ensuring the safety of train operation, and extending the service life of the parts.