Heavy coated basic type electrode, designed for welding weathering steels, like COR-TEN steels, high strength steels, particularly copper containing steels which are resistant to atmospheric corrosion. Due to its high crack resistance under difficult operating conditions such as dynamic loads, high and low enviromental temperatures, suitable to use in fabrication of steel constructions like bridge, stadium, off-shore platforms. Easy to use in root and fill passes. Welds are of X-ray quality.