Thank you very much!
The idea is to be able to build a system that adapts to geometries that do not allow the part to rotate, such as an off-center flange.
The input material will be fed by a system also commanded by Arduino that will be in tune with the welding machine and calibrated according to the abance speed.
The method of centering the part is a problem, but I can solve it with a laser level.
It is a new project and I really want to try, my experience is very scarce but as they say "you learn from mistakes".
Thank you very much again and greetings to all.