The heat source model used in the past numerical simulation of friction stir welding was relatively simple, it cannot well reflect the distribution of temperature field in the actual welding process, and the experiments needs huge investment. Based on thermal elastic plastic method and improved heat source model, adopted ABAQUS software and DFLUX subroutine interface to establish the numerical model of 304 stainless steel and 5052 aluminium alloy friction stir welding, the process of aluminium alloy friction stir welding of dissimilar materials steel were simulated and analyzed the temperature field of welding process, the offset at the same time, speed, and three optimized welding parameters, welding speed was found in speed 500 r/min, welding speed take 80 mm/min, take 2 mm offset, get the welding process of the transient and steady state temperature field in the ideal state. The simulation is more accurate in predicting the temperature change in the actual welding process, and it has a certain guiding role in the selection of welding parameters in the actual welding process, reducing the waste of a large number of tests to obtain the appropriate parameters.The simulation results can guide and predict the actual welding process. |