Welding repair process for cast steel components of railway vehicles

With the rapid development of high-speed trains in China, the current market has a total of over 4000 trains. During the new manufacturing process of railway vehicle cast steel components, due to manufacturing defects such as pores, cracks, shrinkage porosity, shrinkage cavities, and critical dimensions exceeding the tolerance, deformation, processing errors, etc., they are prone to scrapping. After a period of operation, products entering the service and maintenance periods may also experience component size exceeding the tolerance, deformation, and excessive wear. Under extreme load conditions, destructive defects such as cracks may even occur, Bringing great hidden dangers to train operation and passenger safety.

Welding repair of cast steel components of rail vehicles 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 reduced product performance and even lead to product scrapping. Therefore, standardizing the welding repair process and quality control points of railway vehicle steel castings is the key to meeting performance and quality requirements, ensuring train operation and safe passenger travel.

Welding repair of cast steel components for railway vehicles is a crucial and important process that involves the safe operation of trains and the personal safety of passengers. By standardizing the welding process requirements and key quality control elements, recommended welding process parameters are proposed, providing a reference for the welding process and quality control methods of rail transit cast steel components, ensuring that the welded components can meet the performance requirements again, ensuring train operation safety, and extending the service life of the components.