In this study, microstructural and mechanical properties of a (butt) weld, joining two base metal alloys 617 and A387-Gr.11 steel, were investigated. Fusion welding was performed using gas tungsten arc welding. Three different filler metals of ERNiCrMoCo-1, ERNiCr- 3, and ER309L were used to perform welding. Microstructural analysis was conducted with optical and scanning electron microscopes. Microstructural observations revealed that the extent of carbon migration and martensite phase formation in the transition zone is reduced by using filler metals of higher Ni content. For the ERNiCrMoCo-1 filler metal, unmixed zone in alloy 617 base metal side was eliminated. Microhardness, impact, and tensile tests were carried out to determine the mechanical properties of the dissimilar metal welds (DMWs). The welds made by using ERNiCrMoCo-1 filler metal resulted in highest hardness and impact energy, whereas ERNiCr-3 filler metal weld displayed the highest tensile strength, yieldstrength,andelongationincomparisonwithother fillers.Based on the results, the ERNiCrMoCo-1 filler metal was found to be the best filler metal choice for the DMWs of these two base metals. . . . . Keywords Alloy 617 A387-Gr.11 steel Dissimilar metal weld Microstructural properties Filler metal Recommended for publication by Commission II - Arc welding and Filler Metals Highlights � Dissimilar
Welding in the World – Springer Journals
Published: Jun 6, 2018
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