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A Comparative Evaluation of ENiCu-7 and ENiCrFe-3 Electrodes for Dissimilar Metal Welding Applications(Materials, Metallurgy & Weldability)

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A series of studies were carried out to examine the effect of chemical composition and dilution on the corrosion properties of dissimilar joints between low carbon steel and Monel 400 alloy. Such joints are important parts in oil gasification plants. This kind of joints requires good corrosion resistance and mechanical properties, a stable magnetic permeability besides good weldability. The average chemical composition for weld metals was calculated based on the average dilution of welds. It was shown that the predicted weld analysis more or less agrees with experimentally measured results. The post weld heat treatment (heating at 300℃, holding for 30min then heating at 650℃ holding for 30min, heating to 900℃, holding for 30min and then rapid cooling) gives the lowest corrosion rate.



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