Numerical Simulation of AZ31B Magnesium Alloy Laser-arc Hybrid Welding with New Heat Source Model

摘要

A new heat source model of laser-TIG hybrid welding is established based upon Rotary-Gauss body heat source model and Gauss area heat source. The model must consider the physical properties of Magnesium and the characteristics of hybrid welding in which two heat sources are not repeated addition simply. On this basis, the numerical simulation of hybrid welding temperature field and welding seam sectional form is performed. Compared with the experimentally result, it is found that the new model can simulate hybrid welding of AZ31B magnesium alloy accurately. The characteristics of hybrid welding including high welding speed, energy increased and narrow heat affected zone are verified by the calculated result of numerical simulation.