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In this research, impact of micro-addition of antimony powder (70 μm) on the weldability of preheat treated carbidic austempered ductile iron was investigated. Carbidic austempered ductile iron of different amount of micro-addition of antimony powder was produced by employing sand casting techniques. The cast samples were subjected to preheating treatment at a temperature of 400 °C to reduce the inherent stresses in the cast samples before welding the work pieces together. The preheated samples pieces were welded together using shielded metal arc welding. The microstructure of the welded antimony modified CADI showed graphite diffusion in the bead with uniform distribution of phases, improving weldability. The presence of antimony in the produced CADI helped in reducing the size of the carbides to granular form, thereby making this material possess good weldability.

INVESTIGATION OF MICRO-ADDITION OF ANTIMONY ON THE WELDABILITY OF PRE-HEATED TREATED AT 400 °C CARBIDIC AUSTEMPERED DUCTILE IRON (CADI)