Numerical Simulation of Package Temperature Field for Electrostatic Sensor Based on Friction Stir Welding
The friction stir welding was employed to package titanium alloy shield of electrostatic sensor in aero-engines.The heat input mathematical model in the process was established,then the model is applied to simulate the whole temperature field in the welding process,and is tested and verified by the experiment and the finite element simulation.The results show that during the welding process,high temperature region of the work piece surface expands gradually,and the stirring head position is always the highest temperature in the region.The area shows half ellipse shape of in the front of small of the back width.The temperature distribution inside the work piece would be analyzed by metallographic structure.The area which metallographic structure changes greatly is heat-affected zone.While the instantaneous temperature of the work piece increases.the heat source effect decreases,then the temperature gradually reduces,which can provide references for the electrostatic sensor packaging in aero-engines.