Shield directing inert- or active gas curtain around gas torch nozzle or burner head, used for autogenous workpiece treatment or processing, comprises tube surrounding and partially enveloping flame

摘要

A blanketing gas device (100) or shield is proposed, for a nozzle or burner head (10) used for autogenous treatment or processing of a component or workpiece (B). The shield directs at least one blanketing gas (H) towards the workpiece. The gas envelopes the flame (F) emerging from one or more nozzles, or the burner head, towards the workpiece. The gas flows in the interspace between the outer wall (12) of the nozzle or burner head (10) and the inner wall (22) of the shield (20). The gas is argon, oxygen, carbon dioxide, helium, nitrogen or hydrogen. The shield is hollow-cylindrical. Its end region (24) facing the workpiece, protrudes beyond the end of the nozzle. Axes of symmetry of the device and of the nozzle, coincide. Processing time can be reduced by at least one third and preferably one half, by means of the blanketing gas. The device is used for a variety of types of heating- and melting burners used for autogenous processing or treatment, including multi-nozzle and special burners. The equipment is used for flame-straightening, torch-cutting, flame heating, gas soldering or joint smoothing. An independent claim IS INCLUDED FOR the method of operation.