Basic type electrode for welding creep resistant steels employed in the fabrication of pressure vessels, boilers and pipes, subjected to operating temperatures of up to 500°C and high strength steels with high impact resistance up to -50°C. Welds are of X-ray quality. Especially preferred for welding of thick sections where high mechanical properties, charpy impact values and X-ray quality are required. Preheating, interpass temperature and post-weld heat treatment shall be done according to base metal used.