Fiber laser-MIG hybrid welding process of commercial pure titanium and its properties

Fiber laser-metal inert gas(MIG) arc hybrid welding was used to weld the commercial pure titanium(CP-Ti).The weld appearance,cross section,tensile strength,Erichsen value and microstructure of the CP-Ti welded joints were studied.The results show that the arc stability is substantially improved and the welding speed can be increased to 7 times by fiber laser-MIG hybrid welding.The welded joints by laser welding and the hybrid welding exhibit the higher ultimate tensile strength than those of the base metal.In addition,the welded joint by the fiber laser-MIG hybrid welding has higher Erichsen values than that by laser joints.The difference in plasticity is attributed to the microstructure changes in the welded joint of hybrid welding.Thus,the fiber laser-MIG hybrid welding of CP-Ti can be carried out successfully at higher welding speed with a good combination of weld bead appearance and plasticity.