Weldability of spheroidal graphite ductile cast iron using Ni / Ni-Fe electrodes
Keywords:Weldability, Ductile iron, Electrodes, Microstructures, Arc welding
Weldability of spheroidal graphite ductile cast iron was established using a cheap Ni-Fe and a high purity Ni electrode. A preheating treatment at 350 °C and an annealing treatment at 850 °C were carried out to improve mechanical properties of welded pieces. The pure Ni electrode showed graphite diffusion in the bead with a uniform distribution of phases, improving weldability and decreasing fragility. Preheating and annealing treatments increased ductility and improved weldability.
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