METHODS FOR PROVIDING A HARDENED SURFACE, FOR REFURBISHING A CABLE DRUM, AND APPARATUS THEREFOR

摘要

A method for providing a hardened surface on a heavy machinery component, especially but not exclusively a dragline cable drum, comprises adding a martensitic steel to at least one area of the component by a metal deposition process, while the component is maintained at a temperature below the martensitic start temperature of the martensitic steel and above the martensitic finish temperature of the martensitic steel, machining the added steel while maintaining the temperature of the added metal at a temperature below the martensitic start temperature of the martensitic steel and above the martensitic finish temperature of the martensitic steel and then cooling the component so that at least some of the added steel obtains a greater hardness.