Numerical Simulation Research On Linear Friction Welding Of Ti6A14V Alloy

Regarded an advanced solid-state joint technology, resorted to the high efficiency and good quality characteristic, linear friction welding (LFW) has been accepted, especially in manufacture and repairing of high thrust-weight ratio aero-engines, which has become one of the most economical and available technologies.According to the basis theory of linear friction welding and the representative weld process, the frictional characteristics of relative slippage surface and the influence that interface load, temperature, and relative rubbing velocity act on the interface coefficient of friction is analyzed.Consulting the literature research, the rule that frictional heat generate is discussed. Based on all-sided comprehension of previous research and according to the principle of kinematics, equation of heat generation during weld process is computed again. It is identical between calculated result and previous theory.According to the basis theory of linear friction welding, using thermo-mechanical finite element method, two-dimensional elastic-plastic FEM model is established. The process of welding is deeply analyzed. Various finite element models are established to simulate different welding phases of temperature field, stress field and strain field. The geometric nonlinearity and material nonlinearity during simulation is solved by using the grid redraw function of ANSYS. The extrusion stage of plastic metal is simulated for the first time.The limited power input and the lowest value of axial pressure, amplitude and frequency that could finish welding process is worked out by design advanced simulation project and regulate the heat input parameter. It is important to understand the welding process deeply and take good control on input parameter, which is finished during this work.The feasibility that using laser assistant heating to get advanced temperature field of weld process is discussed by modify finite element model. Finite element model of laser assistant heating is established. Contrasting to general way, this method can...