Laser cutting device and method for additive manufacturing of thin-wall metal pipe fitting

The invention belongs to the technical field of laser additive manufacturing, and provides a laser cutting device and method for additive manufacturing of a thin-wall metal pipe fitting. The printed thin-wall metal pipe component is subjected to original position laser cutting so as to be separated from the base plate, and the problem that positioning errors are caused when the base plate and the thin-wall metal pipe component are separated through linear cutting is solved; five degrees of freedom of the five-axis 3D printer meet the cutting position requirements of various complex end faces during laser cutting of thin-wall metal pipe components, and the problem that linear cutting cannot meet the cutting requirements of pipes with complex end faces is solved. Slag cooling gas is introduced into the printed thin-wall pipe, the slag generated by laser cutting is cooled, and the problem that in the laser cutting process of a pipe component, the slag adheres to the interior of the thin-wall pipe component, and