Abstract
As titanium generally combines with oxygen at high temperatures to form a brittle region, the performance of a purging device for shielding welds in titanium welding is an important factor. Therefore, this study is focused on investigating the performance of a purging device. The nozzle length is changed using CFD (Computational Fluid Dynamics) to confirm the shielding performance of the purging device, and the shielding performance is predicted by the volume fraction of the shielding gas at laser beam focus. Next, the quality of the primary welding workpiece is checked. In addition, a hardness test and a tensile test are conducted to confirm the change in mechanical properties according to the nozzle length. A comparison of the calculated and measured results confirmed that a good weld can be obtained when the laser beam focus is more than 67% shielded in the lap-joint welding of a titanium thin plate.
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