Numerical Simulation Of1060Aluminum Friction Stir Welding Temperature Field

One of the important research field of friction stir welding is the temperature field research and the heat production in welding process. Heat production mechanism and temperature distribution in friction stir welding process, which play a crucial role in welded joint quality and mechanical property, can forecast the flow field of the welding joint area, stress and strain and hardness. In this paper, temperature distribution of friction stir welding was studied based on numerical simulation and experiments.In numerical simulation, heat producted by shoulder and stir tool were considered based on Abaqus finite element software, according to tribological theory and Mises yield criterion, heat source model is established using shear force work as basic parameter, and J-C material constitutive equation was used to achieve adaptive heat production model. In the experiment, thermocouple temperature measurement technology was adopted to obtain the temperature cycling curve at different position feature points. The Contrastive Analysis of the experimental data and the numerical simulation results was made, and the results showed that the model was reasonable and had better precision. And then the model was used to calculate the influence law of different boundary conditions on the temperature field.According to the analysis of4mm plate temperature field of1060aluminum, the temperature at any time and any point of the plate can be obtained, and the dynamic temperature change and temperature distribution in different directions in the welding process can be learned intuitively. The influence of the welding speed, rotationl speed and their ratio on the temperature field can be obtained by changing the welding parameters.The rotational speed affects only the the size of the heat input but dose not affect the trend of temperature changes.When the rotation speed increase,the temperature will increase,but not the linearly proportional to the increase in the temperature.When the welding speed increases,the heat accumulated time will be shorter,which results in a peak temperature decrease and the larger temperature gradient. Changing the shoulder radius showed that the longer the shoulder radius is, the higher the overall temperature field would be, and the temperature difference between both surfaces became enlarged, temperature peak value of plat with copper plate was lower than it with steel plate. The actual production application, the difficulties of the aluminum alloy welding plate surface temperature difference lies mainly in the up and down too much, lead to tissue uneven and welding defects, through to the4mm,15mm plate for simulation respectively on the surface temperature up and down that influencing the parameters, then brings forward of the plate in the aluminum alloy of the optimization of the friction stir welding process parameters..