The Process Study Of Welding Finite Element And Deformation Control About Turbine Cartridge

GH4169 high temperature alloy is mainly used for welding processing on turbine cartridge on aero engine,the traditional process is TIG welding,and even after heat treatment,there are still large welding stress and deformation made by welding,impacting components machining requirements,the 8 supporting plate position degree and the small diameter difference lead directly and phase parts interference failures in the process of engine assembly.In view of the turbine rear case assembly,the traditional TIG welding process is optimized by numerical simulation technology and experiment in order to control the welding deformation and improve the production efficiency.First of all,according to the turbine rear casing assembly structure characteristics and technical requirements,welding method of turbine casing of traditional TIG,the weld pool during the steady state.Finally,the main reason that affects the deformation of turbine casing is that the welding heat input is too large,the welding fixture structure is not scientific,the welding sequence is unreasonable and the welding deformation is not enough.Secondly,the numerical simulation of typical flat specimen is carried out,and the heat source model of the numerical simulation is checked through the molten pool profile and the thermal cycle curve of the plate specimen to ensure the rationality of the heat source model adopted.According to the traditional TIG welding method was basically consistent with the actual situation.At last,According to the actual situation of the parts processed in the factory,the change of the weld seam to electron beam welding and pre deformation of welding is put forward,and the two schemes are simulated and studied respectively.Through the simulation analysis of the two schemes,the combination of the two methods is carried out to obtain the best process plan,and the best process scheme is verified by welding test.The results show that the optimization scheme can ensure the position of the parts after welding to ensure that in 0.8mm,the middle web to the center axis of the casing 390 minimum distance.Recently,The research results have been applied to guide the actual welding production of the turbine case assembly,and the fixture has been designed and manufactured.The qualification rate has reached over 90%,the production efficiency has been raised and the production cost has been reduced.The successful control of the welding angle deformation of the turbine casing has accumulated valuable experience in the process optimization of other products.