Welding thermal characteristics analysis with numericalsimulation for thin-wall parts assembly under different conditions

In order to analyze the welding thermal characteristics problem, the multiscale finite element(FE)model of T-shape thin-wall assembly structure for different thicknesses and the heat source model are established to emphatically study their welding temperature distributions under different conditions. Simultaneously, different welding technology parameters and welding directions are taken into account, and the fillet weld for different welding parameters is employed on the thin-wall parts. Through comparison analysis, the results show that different welding directions, welding thicknesses and welding heat source parameters have a certain impact on the temperature distribution. Meanwhile, for the thin-wall assembly structure of the same thickness, when the heat source is moving, the greater the moving speed, the smaller the heating area, and the highest temperature will decrease. Therefore, the welding temperature field distribution can be altered by adjusting welding parameters, heat source parameters, welding thickness and welding direction, which is conducive to reducing welding deformation and choosing an appropriate and optimal welding thickness of thin-wall parts and relative welding process parameters, thus improving thin-wall welding structure assembly precision in the actual large-size welding structure assembly process in future.