Numerical Analysis of Modes of Induction Weld Deposition of Valve Tappets of Motor Vehicles

摘要

The work is devoted to the reduction of defective weld deposition zone of the pusher, as well as the reduction of the number of defects such as low density of metal, pores, shrinkage holes. For the numerical analysis of the weld deposition process the 3D models were built and the required characteristics for the fused surface of the workpiece were set. The preheat temperature is set from 500°C to 1300°C, the deposited layer of cast iron with thickness of 6 mm the temperature of weld deposition is set as 1250°C, for cooling model the properties of water temperature of 20°C were applied. In the process of numerical analysis of the existing technological process of weld deposition the interrelation between the mode of technological process of welding, temperature of preheating of the workpiece and the size of the defective area of the deposited layer was established. According to the results of numerical analysis using statistical sequential analysis the mathematical model of the dependence of the size of defect-free area of the deposited layer from the preheating temperature of the workpiece of pusher was built. It was found that the lowering the temperature of preheating of the workpiece has a positive effect on the increase in the defect-free layer of deposited metal. weld deposition, defective zone, simulation.