Patent ID: 8188403

Claim:
A laser machining nozzle comprising: a body defining a nozzle tip; at least one gas supply chamber for a laser beam and a processing gas, wherein the supply chamber terminates at an orifice; and a cavity arranged within the body in the region of the orifice of the gas supply chamber, the cavity having a nozzle tip opening that is spaced from the orifice in a direction towards a workpiece to be machined such that the orifice is recessed within the cavity behind the nozzle tip, the nozzle tip opening having a wedge-shaped edge and the cavity having no further openings apart from the nozzle tip opening and the orifice, wherein the cavity has a rounded inner contour that extends behind the orifice in a direction away from the workpiece, and wherein the orifice, the wedge-shaped edge of the nozzle tip opening, and the rounded inner contour of the cavity are arranged so that portions of processing gas exiting the orifice are returned within the cavity via a swirling flow to envelop the processing gas existing the orifice.