Characteristics of 5A90 Aluminium-Lithium Alloy by YAG-MIG Hybrid Welding
The characteristics of 5A90 Aluminium-Lithium alloy by YAG laser and MIG arc hybrid welding (Hybrid welding) were studied. Compared with the laser beam welding (LBW), the hybrid welding could not only improve the weld appearance significantly, but also have better engineering compatibility. The obvious microstructure characteristic of joint by the hybrid welding are fine-grained layer near fusion-line and the equaixed grain in most area of welded seam. The subgrains of the equaixed grains, located in the weld center, tend to coarse from bottom to top of weld joint. The microhardness of welded seam by the hybrid welding (83.57HV0.2) is lower than that by LBW (95.65HV0.2), but the uniformity of the former is better than that of the latter. The ultimate strength and the elongations after fracture of the joint by the hybrid welding are lower than that by LBW significantly. The tensile fracture always occurs in HAZ or weld centerline, and the fractography presents mixture rupture. Therefore, if the combined mechanical properties of joint by the hybrid welding meet the operation requirements, it should be improved by reasonable artificial aging or heat treatment after welding, and it also should develop a better filler wire matched with the base metal.
al-li alloy hybrid welding lbw microstructure tensile property
F.Xu S.L.Gong L.Chen J.Yang
Science and Technology on Power Beam Processes Laboratory, Avic Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, P.R.China
国际会议
北京
英文
130-134
2010-10-25（万方平台首次上网日期，不代表论文的发表时间）