Microstructure and properties of a dissimilar weld between alloy 617
and A387 steel using different filler metals
Received: 19 August 2017 /Accepted: 17 May 2018
International Institute of Welding 2018
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,andelongationincomparisonwithotherfillers.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
Dissimilar metal weld
Recommended for publication by Commission II - Arc welding and Filler
• Dissimilar metal weld between Alloy 617 and A387-Gr.11 steel using
different filler metals was performed by gas tungsten arc welding.
• Microstructural evolutions and mechanical properties of dissimilar metal
welds were investigated.
• Unmixed zone was formed on Alloy 617 nickel base metal side
interface, whereas, on A387-Gr.11 steel base metal side, carbon depleted
zone and transition zone was formed.
• For the DMWs between A387-Gr.11 steel and Alloy 617 base
metal, ERNiCrMoCo-1 filler metal offered optimum properties at
Novelty In the present work, using GTAW process, effect of different
filler metals on the microstructure and the mechanical properties of
dissimilar metal welds between Alloy 617 and A387-Gr.11 steel were
investigated. From the literature, it is concluded that no work has been
reported on the dissimilar joint of Alloy 617 and A387-Gr.11 steel. So, the
main objective of the work was to identify the most appropriate filler
metal for joining these two base metals.
* Reza Dehmolaei
Materials Science and Engineering Department, Faculty of
Engineering, Shahid Chamran University of Ahvaz, Ahvaz 61357,
Welding in the World