METHOD FOR LASER WELDING USING A NOZZLE CAPABLE OF STABILISING THE KEYHOLE

摘要

The invention relates to a method for welding with a laser beam, using a welding nozzle comprising: a nozzle body having an axis and including at least an upper surface, a lower surface and a peripheral wall; an axial cavity extending between the upper and lower surfaces of the nozzle body so as to define an outer channel recessed from the surface of said peripheral wall; and a plurality of inner passages drilled through the nozzle body between the upper and lower surfaces. The laser welding method of the invention provides a dynamic gas jet mechanically interacting with the molten metal bath, and further enables better control of the bath hydrodynamic flows, and thus better laser-welding efficiency.