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A hybrid welding of high power fiber laser and pulsed metal inert gas (MIG) arc was applied to titanium plate with 6mm in thickness, and the optimum welding condition to make fully penetrated weld bead as well as the metallurgical and mechanical properties of the welded joint were evaluated. It is found that sound one pass fully penetrated square-groove butt joints without any weld defect can be made by optimizing the welding conditions mainly welding speed, arc current, laser power and laser focus position. The hardness and tensile tests indicate that heat affected zone and weld metal are stronger than base metal. It is considered that the strengthening is attributed to the increment of chemical compositions and substructures. [doi:10.2320/matertrans.M2012044]

Formation of One Pass Fully-Penetrated Weld Bead of Titanium Plate by Fiber Laser and MIG Arc Hybrid Welding