Welding 18 Gauge Steel. When the material is 18-gauge and thicker you may be able to use a 030-inch wire. Gas Tungsten Arc Welding of Galvanized Steel M-1 18 through 10 Gauge in the As-Welded Condition with or without Backing but is included for informational purposes only.
61 Bone is right the Harris Twenty gauge wire is far Superior to solid MIG wires for something that thin and would be well worth the effort to locate some. Applications for thin metal are expansive with usage being seen in automotive industry and in the HVAC. If you are using OA hammer-welding is best.
Gas metal arc welding GMAW is a very effective method in joining together thinner materials.
Make sure the welder is qualified for welding sheet steel under AWS or CWS. Continue the same way along the sides of the piece of sheet metal. Ad Find China Manufacturers Of Welding Wire. Stainless steel or 24-ga.