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CO2 gas shield welding wire AWS ER70S-6 is equal to ER50-6,and ER49-1 is equal to HO8Mn2SiA This kind of welding wire is used for CO2 gas shield welding ,being featured by small weld spatter ,high deposition efficiency and stable electric arc, with good blowhole resistant property. For er70s-6:It is not only suitable for welding of carbon steels and 500MPa grade structures of vehicle, construction, shipbuilding and bridge ,but also for high-speed welding of sheet and pipes. Chemical composition of AWS ER70S-6 welding wire(%)CMnSiSPCu0.06 0.151.40 1.850.80 1.15≤0.025≤0.025≤0.50Metal mechanical property of welding seamσb(MPa)σs(MPa)δ5 (%)AKV(J) -30°C≥500≥420≥22 ≥27 For ER49-1 is equal to H08AMn2SiA. This kind of welding wire is used for CO2 gas shield welding ,being featured by small weld spatter ,high deposition efficiency and stable electric arc, with good blowhole resistant property. It is applicable to welding of mild carbon steel and some low alloy steel structure. Chemical composition of AWS ER70S-6 welding wire(%)CSiMnCrNiSPCu≤0.110.65-0.951.80-2.10≤0.20≤0.30≤0.030≤0.030≤0.50 Mettal mechanical property of welding seamσb(MPa)σs(MPa)δ5(%)AKV(J) ≥490≥372≥20 ≥47