K360 steel is a high-strength wear-resistant steel, widely used as an important material in mining machinery and engineering machinery. High strength steel generally has high carbon equivalent, high sensitivity to stress concentration, and poor welding performance. Adopting new controlled rolling and special heat treatment to improve strength while maintaining...
The surface quality of cast steel after welding repair should meet the following requirements: ① For non machined surfaces, the welding repair surface should be ensured to be flat, and the starting, ending, and both sides of the welding repair position should ensure a smooth transition with the base...
For the welding repair of important cast steel components, post weld heat treatment is generally required to eliminate thermal stress after the welding repair is completed. General defects can be locally heated to relieve stress using flame heating or electric heating strips as recommended in the table. When conducting...
Welding repair of cast steel should be carried out before heat treatment of the cast steel. All welding repair operations should be completed as much as possible in the flat welding position. The groove and the range of 15-50mm on both sides should be cleaned thoroughly, and there should...
Preheating is a key process to ensure the welding repair performance and quality of steel castings. The preheating temperature required for the welding repair area should be determined based on factors such as the material of the cast steel components to be welded and the environmental temperature of the...
Before welding and repairing cast steel components, necessary pre welding preparations should be carried out. Firstly, it is necessary to determine whether welding repair grooves are needed based on the defect properties of the cast steel components that need to be welded. When necessary, the shape of the grooves...
The basic requirements for welding repair of cast steel components in railway vehicles include general requirements, enterprise requirements, personnel requirements, environmental requirements, and process requirements. 1. General requirements The welding repair scope of casting defects should comply with the technical conditions, maintenance regulations or drawing regulations of railway vehicle...
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,...
The three-dimensional model of the above stress frame is imported into the sand casting simulation software ProCAST through the surface division grid, and the simulation results are as follows. 1.Temperature field simulation results The results show that the change process of temperature field simulated by ProCAST stress frame is...
The stress frame is a typical sand casting used to simulate the conditions of residual stress produced by actual sand casting and estimate the possible stress value. The structure and size of the stress frame are different, and it can fully reflect the characteristics of the different temperature field...