Numerical Simulation Of Electron Beam Welding Of Aluminum Alloy Thick Plate Based On Image Character

The EBW temperature field affects the stress field and the strain field. The study on EBW temperature field is the foundation of analyzing the stress field and controlling the welding process. Detecting the temperature field of welding is difficult, because the EBW is in the vacuum condition. The temperature field was researched in this work through numerical simulation, which was effective way.MSC.MARC was used to set up a temperature-forecasting model of EBW of 20mm thickness 2219 aluminum alloy. The welding seam and the temperature field were obtained by inputting the current and the velocity. Comparing the simulation with the real welding seam through two groups of experiments that are the changing-current and the changing-velocity, the penetration error was less than 1mm and the width error was less than 0.7mm. The above error was permission. The reason of the error was the model based on the whole board, so some energy was wasted. The effect of current and velocity on the weld shape was obtained, which can guide the technology.Image character parameter was used to improve the precision of the simulation, because it can reflect the penetration. A new model with the image character parameter was set up. The current, the velocity and the image character parameter are input parameter. Then the welding seam and the temperature field are obtained. The penetration error is less than 0.4mm and the width error was less than 0.47mm. There is higher precision of this model than the first model.