Abstract
Shielding gas composition plays an important role in the weldment characteristics of Gas tungsten arc welding process (GTAW).Argon is the commonly used shielding gas which is used in the GTAW of the super alloy Inconel 718, which combines high strength with good creep and corrosion resistant properties up to 650°C.In the present work a comparative study by bead on plate GTA welds were made using pure Argon (Ar) and Argon-hydrogen (Ar-H2) mixture in continuous and pulsed modes while changing the gas flow rates on Inconel 718. Addition of hydrogen to the argon shielding gas has affected the bead morphology. Results from the experiment indicate that the maximum penetration was achieved using pulsed Ar-H2 combination and there is an increase in the bead area, bead width and heat affected zone (HAZ) size compared to pure argon. The arc pulsing caused a considerable increase in bead profile and the flow rate influence on the bead morphology was not significant.
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