Influence of an ERNiCrMo-3 root pass on the properties of cast iron weld joints
Keywords:Cast iron joint, Heat treatment, Mechanical properties, SMAW technique
This article studies the effect of an ERNiCrMo-3 GTAW root pass on the microstructure and mechanical properties of a nodular cast iron joint when the cover passes are made using the SMAW technique and with Ni electrodes. To have a better understanding of the results, they are compared to the characteristics of a full Ni SMAW weld. This was done before and after an annealing at 900 °C in order to evaluate the influence and possible benefits of this heat treatment. The results show that the presence of a GTAW ERNiCrMo-3 root pass, despite improving penetration, leads to a loss of mechanical properties due to the presence of hard phases in the root pass that even an annealing is not able to eliminate.
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