Mild steel copper coated welding wire with excellent welding properties and the welding seams have very high impact resistance at low temperature. Application: Copper coated mild steel welding wire is used to weld ship building steel(A32???E32???D32???A36???E36???D36) and mild steel products with strength at 490N/mm2 degree, such as mild alloy steel 16Mn and 15Mn to produce furnace, tubes for vessel, container manufacture, etc.