A longitudinal fixture designed for straight-line welding applications on metal from 0.13 mm (0.005 in.) and thicker. These fixtures are used for welding cones, tubes, cylinders, or flat sheets, and are available in models capable of producing welds from 0.6 to 3.65 m (24 to 144 in.) in length. They produce fusion butt welded joints free of meltout, burnbacks, extreme shrinkage or distortion.