You say Paul II wire is not carbon dioxide gas shielded welding wire, if the standard of GB/T14958-1994 "gas shielded arc welding wire, there is no difference between the wire and TIG welding wire. GB/T8110-1995 "gas shielded arc welding of carbon steel, low-alloy steel wire" standard applicable to carbon steel, low alloy steel MIG welding with solid core wire, recommended for tungsten arc welding and plasma arc welding The filler metal. So: If you use a different standard, welding wire and two security wire in composition there. Steel wire: By Use: carbon steel wire; Low alloy steels; stainless steel wire; alloy welding wire; copper and copper alloy welding wire; aluminum and aluminum alloy wire; cast iron gas welding wire. 2, according to the welding method: for submerged arc welding wire; Gas welding wire; gas shielded welding wire; the electroslag welding wire. 3, according to the wire cross-sectional shape and structure points: solid core steel wire; drug wire. The carbon dioxide gas shielded welding welding low carbon steel and low alloy steel. TIG welding can weld almost all of the metal material, but mainly for the non-ferrous metals and their alloys, stainless steel and some alloy welding. So, if you weldment material, selected wire composition is not the same.