Abstract
In this study, bead-on-plate welding was performed on a sheet of AA5083 alloy using two distinct welding techniques: gas tungsten arc welding (GTAW) and SpinArc-gas metal arc welding (SA-GMAW). This study compares the microstructural, mechanical, and corrosion characteristics of processed weld beads. The microstructural features of the weld beads were characterized using optical microscope (OM), scanning electron microscope (SEM) and high-resolution transmission electron microscope (HR-TEM). The corrosion characteristics of weld beads were determined by potentiodynamic polarization method, and the corrosion morphology of the specimens were observed under SEM. In addition, a microhardness study was performed on the weld beads across the base metal (BM), heat affected zone (HAZ), and fusion zone (FZ). The findings indicate that the weld bead produced by GTAW exhibited superior corrosion resistance compared to the weld bead processed by SA-GMAW. The presence of porosities in the latter facilitated the corrosive medium to penetrate and break the passive layer easily that developed deeper corrosive pits. The presence of Fe and Mn rich intermetallics in FZ of GTAW processed weld bead assisted in better rate of corrosion observed at 0.1259 mm/yr. The hardness observed in the FZ of the SA-GMAW bead was found to be lower compared to the GTAW weld bead due to the presence of porosities and coarser grains.
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