Influence of filler wire on mechanical and metallurgical behaviour of inconel 690 alloy welded by pulsed current gas tungsten arc welding

Metal corrosion in higher temperature due to stress is the common phenomenon. In order to reduce this issue the nickel based alloys play an imperative role, particularly super alloy 690 is a remarkable one. This is due to the presence of overall chromium content of around 30 % and this shows the much better dominance in resisting corrosion. During welding the microsegregation of chromium is not recommended to be portrayed as a higher constituent. This is being inundated by using fillers like ERNiCrFe-7 (I-52) and ERNiCr-3 (I-82) by using pulsed current gas tungsten arc (PCGTA) welding, which reduces the microsegregation of chromium carbides in the weldments. The segregation is analyzed using scanning electron microscopy (SEM) which reveals that there is no microsegregation in both the weldments (ERNiCrFe-7 and ERNiCr-3) which leads to the formation of fine grains. Specifically, the weld center of both the weldments reveals the equiaxed dendrites. This microsegregation is contributing to the mechanical properties which is being ensured by tensile and impact examination that depicts the strength and toughness of I52 (681 MPa and 68.3 J) weldments are greater than the I82 (662 MPa and 67 J) weldments and both are in turn higher than the base metal in strength.