Heavy coated basic type electrode for welding fine grained and high strength structural steels which have yield strength up to 690N/mm² and tensile strength to 850N/mm². Suitable for welding high strength steels used in fabrications of crane, earthmoving equipment, heavy machinery parts. Due to its high toughness, crack resistance even under difficult operating conditions such as dynamic loads, high and low envriomental temperatures, it is suitable for use is steel constructions, pressure vessels, tanks, boilers and special fabrications and in their root pass applications with safely. Weld deposit is of extremely high metallurgical purity and very low hydrogen content. The electrode features a stable and concentrated arc. Especially 2,50 mm and 3,25 mm diameters well suited for easy positional welding. Welds are of ray quality.