Abstract: A pipe welding tool for delivering inert gas to the interior of pipes being welded. The tool has a center tube and a pair of clamps extending around the tube that support a number of extendible hinged arms. The arms are collapsible, thus allowing the entire tool to adjust to fit within a pipe. Once in the pipe, the arms are released and tensioned against the walls of the pipe. A nozzle is positioned on top of the tube. A quick connect coupling is located at the bottom of the tube and connects with a gas source providing an inert gas. A hose connects the quick connect coupling with the nozzle. A gas lens, connected to the nozzle, has a plurality of holes around its side wall. When the gas is fed into the gas lens, the gas lens releases the gas through the holes in the lens in a 360 degree planar pattern. When positioned within a pair of pipes adjacent to a seam, the tool can serve to provide inert gas to the interior of the pipes and prevent the pipes from burning.