LASER WELDING HEAD AND PROCESS

摘要

The invention relates to the field of laser welding, and in particular to a laser welding head (1) intended to be fixed under a lens for focusing the laser, the laser welding head (1) comprising at least one annular nozzle (5) for the injection of a shielding gas, and a chamber (3) for protecting the focusing lens with a transverse current of air. The annular nozzle (5) is arranged around a clear optical axis (0) passing through the laser welding head (1). The chamber (3) for protecting the focusing lens with a transverse current of air comprises an air inlet (9) and an air exhaust (10) square with the air inlet (9) in a plane substantially perpendicular to the said optical axis (0). This laser welding head (1) is configured to be fixed against said focusing lens with no lateral aperture between the focusing lens and said protecting chamber (3). It ensures a distance (d) of at least 100 mm between an outlet (18) of the annular nozzle (5) and said protecting chamber (3).