Research On Hybrid Palsma-Mig Welding Progress Of Aluminum Alloys

With the rapid development of China Railway, the more demand for of high-speed train carbodies. Achieve high quality and efficient welding is a problem. Recently, research on the Plasma-MIG hybrid welding has just been started at home and abroad. The Research studied on the welding formation, mechanical properties, microstructure of aluminum alloys by Plasma-MIG hybrid welding method. The aim of this paper is to provide foundation for Plasma-MIG welding in high-speed train industry. The changed welding parameters have an effect on quality of welding joint. The Aluminum alloy junction welded by bead weld was observed and measured to reveal the influence of welding parameters on the weld penetration, the weld width. The results show that the weld penetration decrease with acceleration of welding velocity, increase with increase of MIG arc current and Plasma arc current, and firstly increase and then decrease with the increase of plasma gas flow rate and weld torch height. An increase of welding speed will decrease the weld width, while the weld width remained unchanged when other parameters are changed.The welded process of6mm thick5083and6061aluminum alloys by Plasma-MIG hybrid welding, with the criteria of surface formation, the X-ray detection. Convention mechanics performance of two kinds of aluminum alloys weld by hybrid Plasma-MIG welding. The results show that the tensile strength of5083Plasma-MIG welding joint was not higher than that of the laser-MIG welding joints, the MIG welding joints. The tensile strength6061aluminum alloy weld by plasma-MIG hybrid welding head reach53.6percent of the base metal. The microstructure of each region is very different from each other, just because they have experienced different thermal cycle effects.For a better selection of welding parameters, the research explored hybrid heat source model of aluminum alloy in Plasma-MIG welding numerical simulation of temperature field, Initially established hybrid heat source model by integrating Gaussian conical heat source model and Double ellipsoid heat source model. The effects of variation which welding velocity, energy distribution ratio on aluminum alloy in Plasma-MIG welding numerical simulation of temperature field were researched.