METHOD OF SURFACE-HARDENING NODULAR CAST IRON BASE METAL

摘要

A hardfacing 16 is applied to a nodular iron base metal 15 without preheating or postheating the base metal. Initially a gas tungsten arc welding torch is applied to the base metal (at ambient temperature) to form a puddle of the base metal. Then a filler metal, e.g. a high chromium iron, is fed into contact with the arc to form a melt of the filler metal on the base metal. The base metal is then allowed to cool to ambient temperature with postheating.