Abstract: Based on the open loop mode and closed loop mode interactive control of welding force,the axial loading hydraulic system of friction welding machine was developed to control the axial welding force in the auxiliary welding process and three-stage friction welding process. From the auxiliary process to the automatic welding process,the change of axial force goes through seven stages. The axial force under the control of open-loop mode has no obvious influence on the reduction of friction welding and the size accuracy of workpiece after welding in the auxiliary process; In the three-stage friction welding process,the control accuracy and stability of the axial welding force under the closed-loop mode control have a direct and indirect influence on the axial reduction of friction welding and the dimension accuracy of the workpiece after welding.The axial friction welding machine developed based on the welding force open-loop mode and closed-loop mode interactive control mode can realize the friction welding of 40 Mn2 material and XDZ190 supporting heavy wheel,the welded joint is well formed,and the reduction precision of the friction welding of the workpiece is controlled within 0~0. 5 mm.