New possibilities for welding and surfacing of grey iron

Abstract

Results of investigations on development of new consumables for welding and weld surfacing of grey cast iron are presented. It is shown that through the influence on physical and chemical properties of liquid cast iron in the welding pool, the graphitization process, structure and properties of welds and weld overlays can be effectively affected. Arc weld surfacing with tube electrodes, without preheating or with that only up to 300°C, is a way which enables us to obtain sound weld overlays, the structure and properties of which are similar to those of grey cast iron. The method is useful for the repair of small casting defects.

Keywords:

• grey cast iron
• heterogeneous graphitization nuclei
• tubular electrodes