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Pure titanium sheet of 0.6 mm in thickness was butt welded without after gas shield using a pulsed YAG laser welding machine. Effect of welding conditions on the pulsed YAG laser weldability was investigated concerning the bead appearance, mechanical properties and microstructures of welded joints. On the optimum welding conditions, the welded joints were free from welding defects and showed satisfactory bead appearance. Without after-gas-shield, color of the bead surface did not change. The microstructure of the fusion zone showed epitaxial growth of coarse columnar grains from the fusion boundary. Hardness in the fusion zone of the welded joints showed a higher value than that of the base metal. Regardless of the welding conditions, both tensile properties and bending properties of the joints showed almost the same tendency to those of the base metal. From the deep drowing test, the formability of butt welded sheet showed nearly equal to that of the base metal regardless of welding speed. As a result of this study, it became clear that YAG laser welded pure titanium thin sheet showed excellent formability.

Structures and mechanical properties of butt welded pure titanium sheet using pulsed YAG laser