Numerical Simulation Of Laser Welding For Aluminum Alloy With Different Thickness

Welding is a complicated physicochemical process which involves in electromagnetism, heat transferring, metal melting and freezing, phase-change welding stress and deformation and so on. In order to get high quality welding structure, these factors have to be controlled. If welding process can be simulated with computer, the best design, procedure method and optimum welding parameter can be obtained.By using ANSYS soft, a 3D temperature field of aluminum alloy for different thickness with laser welding was simulated, In order to improve solution accuracy and efficiency, the transition mesh was used. Gauss function heat source model was chose. ANSYS' APDL to compile program to apply load of moving heat source was used. The effects of temperature-dependence material parameters and potential heat, boundary conditions, plasma, melting pool convection and characteristics of different thickness are considered in the model. By using high-temperature thermocouple, the temperature was measured. It is shown that the simulation results are in accordance with the experimental results.The effects of temperature-dependence material parameters were considered in the model. The BKIN was established. Some proper restrictions of displacement were applied for simulating effect of clamps. The result of simulation indicates that, the stress-strain field in the thinner plate is larger than thicker one. Using hole-drilling technique, the residual-stress was measured. It is shown that the simulation results are in accordance with the experimental results.Melting characteristics of aluminum alloy for different thickness with laser welding were analyzed. In order to compare to welding line in different welding modes, Gauss function heat source model, body heat source model, and combination heat source model were chose, which stand for the three different welding modes in laser welding respectively. By using ANSYS soft, the 3D temperature field and shape of welding line of aluminum alloy of different thickness on laser welding are simulated. It is shown that the simulation results are in accordance with the combination heat source model.The model of gap-filling of different thickness tailored blanks in laser welding wasintroduced. The connection with offset and gap, thickness of work-piece, radial beam of laser was established. The different thickness of work-pieces which were used in laser welding of different thickness tailored blanks. It is shown that the calculative results are in accordance with the experimental results. The calculative results as reference would use in laser welding of different thickness tailored blanks.