Research On Key Process Parameters Of Compressor Blade Surfacing Welding

Aircraft engine blades work under high temperature and high pressure and complex stress conditions for a long time,and they will suffer wear,corrosion,cracks and even fractures.Blade damage not only jeopardizes flight safety,but maintenance also increases aircraft maintenance and time costs.Micro beam plasma arc welding(MPAW),as an important method for welding thin-walled parts,is widely used in the field of aero engine blade maintenance.Repairing and rebuilding blades using micro beam plasma arc welding can save time and aircraft operation and maintenance costs.During the repair process using MPAW,the repair of blades of different thicknesses and different materials requires different input power,and the normal operation of aircraft engine has higher requirements for repairing blades.Therefore,it is of great significance to study the key process parameters of compressor blade surfacing repair.First,the heat source distribution characteristics of plasma arc welding were analyzed based on energy conservation,mass conservation,and heat transfer equations.The 3D modeling software NX10.0 was used for 3D digital modeling,and the simulation analysis software COMSOL Multiphysics was used to establish a combined heat source model.The simulation of the moving heat source can obtain the temperature field change and heat transfer law in the welding process,and the applicability of the heat source model is verified using experimental data.Secondly,the repair process of MPAW is studied,and the heat source moving speed during welding is used as a variable.Based on the combined heat source model,simulation calculation is performed to obtain simulation results under different parameters.Combined with engineering experience data,the results are compared and analyzed horizontally to get a better parameter selection.Finally,according to the MPAW surfacing model,the influence of the heat input parameters on the temperature and the molten pool during the surfacing process is analyzed.The thermal physical parameters of the two nickel-based alloy materials are analyzed and compared.The test compares and analyzes the experimental results,and provides a theoretical reference for the parameter setting of the surfacing repair of nickel-based blades under the existing setting conditions.