Joint Properties And Temperature Field Studies On Friction Stir Welding Of 5A02 Aluminum

The temperature field during the FSW welding process is important factor on the mechanical properties and micro-structure in welded joint, and is principal for understanding seam metal flow, welding stress and deformation analysis. This paper studies the temperature field of aluminum alloys FSW by numerical simulation and experimental measuring and welded a lot of 5A02 aluminum plates 6mm in thickness .The result obtained the optimal welding parameter for FSW of 5A02 aluminum. And some influence rules including the stir tools, the tool's rotational speed, welding velocity also were summarized in this study.According the result of temperature measuring: the temperatures of advancing side are higher than those of retreating side and the top surface of temperature are higher than those of lower layer during the welding process;the temperatures of latter material are higher than those of others parts;the highest temperature is located in the weld centerline. The measured maximum temperatures tend to decrease with the welding speed increases while increasing the rotational speed tend to increase the maximum temperatures.With the ANSYS finite element software, a three-dimensional heat transfer model that analyzed the temperature distribution of 6mm thick 5A02 aluminum FSW was presented in this paper. Compared with the measured temperature, the thermal model and the laws that were got by experimental measuring were tested. The model can obtained whole temperature field in any sections and any time. According to the result of the simulation, the present work study two factors which influence the quality of joints welded. The factors were the preheating time of stir tools and the choice of material of backing plate.