The CW-18 Circle Welder is designed for welding of nozzles into vessels or domed heads utilizing SUB-ARC. The CW-18 mounts on a 3-Jaw Chuck welding diameter 6" to 50" (152-1270 mm) O.D. It is capable of using welding wire diameters 3/32-7/32" (2.4-5.6 mm).