Laser Assisted Brazing of Titanium to Aluminum Alloy
Laser assisted brazing with Al-Si fillers in V-shaped groove configuration is a perspective method for joining of aluminum alloys to titanium. The present work introduces multiscale model that allows estimating diffusion process at titanium/melted zone interface in function of thermal history of welded plates. 3D model of heat transfer with moving laser source and fixed geometry is linked to 2D model of cross section of the groove where Fick equation is solved. Model allows estimating the effect of thermal field on diffusion distance of Ti in the melted zone and thus predicting the fraction of brazed surface of chamfer. Associated parametric studies help to understand the effect of joint geometry and heat source parameters on brazing efficiency and propose optimized operational condition.
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