Numerical Analysis On Radial Friction Welding Of T2 Cu And 35CrMnSi Steel

Radial friction welding technology has a good application in the bullet band connection of weapons industry.Compared with the traditional methods,it has the advantages of less microstructure defects,easy operation and good controllability.But the closed belt structure with large plastic deformation force,would lead to the problem of larger torque easily in the welding process.Based on the problem that closed bullet band is not easy to get in touch with the internal workpiece,this paper proposed a new structure of opening belt radial ring in order to make use of the small plastic deformation force of opening structure to avoid the problems in closed loop structure.Based on the characteristics of radial friction welding and the theories of rigid plastic mechanics,heat transmission and finite element theory,using DEFROM analysis software,the models were established which were the closed T2 copper ring and 35 CrMnSi steel shaft welding model as well as opening copper ring and the steel shaft welding model.After numerical simulation,the results were achieved such as welding workpiece macro morphology,temperature field,stress and strain field distribution and the variation trend of different position.The reasons for different joints were analyzed and compared to study the influence of radial ring structure on the welding joints.With the radial friction welding machine,under three groups of process parameters,the welding experiments of closed T2 copper ring and 35 CrMnSi as well as the opening one and the steel shaft were conducted.Welding joint performance was analyzed for closed loop and opening loop,comparing the experiment results with simulation model to verify the reliability of simulation.This study provides the reference for the application of the opening ring in the bullet band.