The aim of this work is to investigate the effects of power, welding speed, defocusing on geometric features and on
defects of 1 mm Ti6Al4V laser welded butt joints by a new generation disk laser with 2 kW of maximum power. Them
active gain is a Yb:YAG disk instead of traditional Nd:YAG rods. Disk geometry allows to keep the nominal beam
quality also at high power because there is no thermal lensing effect, typical of rod geometry. A three level Box-Behnken
experimental design with three repetitions is carried out for a total of 45 tests. Linear and quadratic regression equations
are developed to relate the input factors to the output variables in order to predict the geometric features of butt joints.
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