Basic type heavy coated electrode for welding creep resistant and high- pressure hydrogen resistant steels used in construction of pressure vessels, boiler and piping subjected to operating tempetarures up to 600°C. Owing to its double covering the electrode has a stable and concentrated arc, thus being well suited for root pass and positional welding. Welds are of X-ray quality. Preheating, interpass temperature and post-weld heat treatment should be done in accordance with base metal to be welded.