Abstract
Hybrid welding process of 10 kW class fiber laser and pulsed metal inert gas (MIG) arc was applied to pure titanium plates with thickness of 12 mm, and the hybrid weldability of the pure titanium thick plates was investigated in the present study. It is found that sound welded joints with good bead appearance and high tensile strength are available by single pass welding from both sides using the optimized welding parameters. The hardness of both weld metal and heat affected zone is slightly higher than that of base metal. Laser focal position is an important parameter, and welding spatter and defects can be remarkably reduced or prevented by focusing laser beam on back side of titanium plate.
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