Abstract
Fiber laser and MIG arc hybrid weldability of Ni alloys was evaluated by changing welding parameters, such as laser power, welding current and welding speed. For the Inconel 601, a sound weld without inside defects was obtained under the conditions of welding speed 2-3 m/min and laser power 6-10 kW. For the Hastelloy C-276, however, a sound weld without hot crack was not obtained. Hardness at the center region of weld metal was slightly higher than that of base metal for both the Inconel 601 and Hastelloy C-276. Transverse tensile strength of hybrid welded joints of Inconel 601 and Hastelloy C-276 was almost identical with that of their base metals.
