Heavy coated basic type electrode for welding low alloy high strength steels, particularly fine grained structural steels. Due to its crack resistance even under difficult operating conditions such as dynamic loads, high and low environmental temperatures, it is suitable for use in steel constructions, pressure vessels, tanks, boiler and special fabrications such as submarines and ships where military specifications are required. It can also be used for root pass applications of these constructions with safely. Weld metal is tough, resistant to cracking and has X-ray.