Welding wire electrode, Cu coated in combination with flux is suitable for welding of construction steels, boiler steels and shipbuilding steels. It is used for making butt welds and fillet welds in general purpose steel constructions, pressure vessels. It is also used for pad welding on railways. Welding wire of diameters in the range from 2.0 to 5.0mm. Larges diameters are produced upon a beforehand made agreements.