Gas shielding apparatus for welding

摘要

A gas shielding apparatus for shielding a weld with a gaseous substance. The gas shielding apparatus includes a shroud body mountable to a torch body having a first plenum for producing a primary shield stream and a first delivery structure for delivering the gaseous substance to the first plenum. The shroud body has a second plenum defining a secondary shield stream substantially surrounding the primary shield stream. A trailer shield portion extends laterally from the shroud body and has a second plenum for producing a trailer shield stream. The apparatus also includes a second delivery structure for delivering measured amounts of the gaseous substance from the first delivery structure to the second plenum and the third plenum. The second delivery structure is coupled to the first delivery structure upstream from the primary plenum when the shroud body is mounted to the torch body.