... CO2 gas protective welding, with stab.... Mild Steel Welding Wire (HTW-49)Conform with GB/T ER49-1Description ... : HTW-49 is a mild steel copper coated welding wire suitable for CO2 gas protective welding, ... welding process properties. Application: Used to welding steel for ship building(A32,E32,D32,A36,E36, ... at 490N/mm2 degree, such as mild alloy steel 16Mn ,15Mn ect to produce furnace, tubes ...