Abstract
Dissimilar weldments of Monel 400 and UNS S32750 are widely used in pressure vessels and marine industries where the weldments are exposed hot corrosion and can withstand this effect as they offer excellent corrosion resistance and improve the service life. This research paper aims at investigation on the weldability and welding strength of dissimilar welded joints of UNS S32750 and Monel 400 developed by pulsed current gas tungsten arc welding technique. ERNiCrMo-4, ERNiCrMo-3 and ER309L fillers were used to join the base metals. Mechanical properties were demonstrated by using tensile test, impact toughness test and microhardness. The ultimate strength of ERNiCrMo-4 weldment was increased by 16.2% and 20.2% when compared to ERNiCrMo-3 and ER309L weldments, respectively. The fracture has occurred under direct tension test in all the cases at the base metal of Monel 400. The superior impact toughness value (169 J) was observed in ERNiCrMo-4 filler weldment than the ERNiCrMo-3 (144 J) and ER309L (76 J) filler weldments. The average hardness number of ERNiCrMo-4 filler weldment (318 HV0.1) was higher than those of ERNiCrMo-3 (306 HV0.1) and ER309L (286 HV0.1) filler weldments.
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