Dual Focus Nd:YAG Laser Welding of Titanium Alloys: Effect on Porosity Formation

摘要

The dual focus technique has been considered as a method for reducing porosity formation when Nd:YAG laser welding of titanium alloys. Response surface methodology has been used to examine the effects four process variables - foci orientation, foci separation, welding speed and power ratio - have on the formation of porosity. The statistical results and high speed imaging have shown that both transverse and in-line foci orientations, with controlled foci separations and welding speeds, can be used to establish a stable elongated keyhole, promoting low porosity welds.