co2 copper coated welding wire ISO9001:2008 material:low carbon steel Diameter:0.8,1. ... ,1.2,1.6mm 5kg or 15kg/spool co2 copper coated welding wire ISO9001:2008 material:low carbon steel Diameter:0.8 ... :ER70S-6 is a kind of mild steel copper coated welding wire , suitable for 100% CO2 and Argon & CO2 mixed gas protective ...