Research On Hybrid Palsma-MIG Welding Progress Of Medium Thickness Plate Aluminum Alloys

Aluminum alloy is widely used in the products of welded structures because of a light weight, high strength, corrosion resistance and so on. Traditional welding methods for aluminum alloy has many defects, resulting in the decline of the mechanical properties. Plasma-MIG hybrid welding is a new type of welding method, which combines MIG arc and plasma arc at the same welding torch.MIG arc and plasma arc work together to achieve efficient welding. It has large welding penetration,high welding speed, less deformation,.particularly for the welding of medium and thick plates. Currently, research on hybrid welding of aluminum alloy material mostly focus on high power laser and MIG arc compound, for research of Plasma-MIG hybrid welding of aluminum alloy is less.In this paper, aluminum alloy 6005 and 5083 aluminum alloy material for the study of plasma -MIG complex research carried out some hope for plasma welding to provide a theoretical basis -MIG composite aluminum plate welding in the production and application of the promotion.The welded process thick 6005 aluminum alloys with 16mm thick and 20mm thick 5083 aluminum 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 of 16mm thick 6005 aluminum alloys Plasma-MIG welding joint was not higher than that of the laser-MIG welding joints, the MIG welding joints. The tensile strength 20mm thick aluminum alloys weld by plasma-MIG hybrid welding head reach 70 percent of the base metal.According to the national standard sample preparation, the weld zone, fusion of joint zone, heat affected zone and the base area, base metal Crystal phase for analysis.The microstructure of each region is very different from each other, just because they have experienced different thermal cycle effects. the research exploredFor a better selection of welding parameters, the numerical simulation of plasma -MIG composite aluminum welding temperature field were explored. The effects of variation which welding velocity, plasma current on aluminum alloy in Plasma-MIG welding numerical simulation of temperature field were researched. We found that the simulation results is consistent with the actual situation.The weld penetration decreases with the acceleration of welding velocity, increases with the increase of plasma current.