In this work, the corrosion and creep properties of weld beads produced on AA5083-H111 alloy using SpinArc gas metal arc welding process were analyzed. For that, bead on plate welding was carried out considering welding current, filler spin diameter and filler rotation speed as input parameters. It is evident from the microstructures that change in filler spin diameter and filler rotation speed altered the shape of weld bead irrespective of welding current. Also, porosities were formed at both side walls where the columnar dendrites grow upward while the equiaxed dendrites zone contains comparatively fewer porosities. On comparing the left and a right side wall, a higher density of porosities are observed at the right side wall and the direction of rotation was expected to be responsible for this occurrence. The pitting morphology of both side walls was not similar due to the variance in concentration of Mg and a higher amount of Mg exists on the right side wall led to the precipitation of Mg-rich rich particles result in severe corrosion. A welding current of 130 Amps, the filler rotation speed of 1050 rpm and filler spin diameter of 2 mm produced a high density of dislocations and a higher number of Fe and Mn-rich intermetallics at grain interiors as well as grain boundaries, thereby, results in improved corrosion and creep properties of weld. The weld contains larger porosities results in poor corrosion and creep properties.
Aluminum alloy SpinArc GMAW Corrosion Creep Porosity Transmission electron microscope
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The authors would like to express their most profound appreciation and sincere thanks to Swastik Industrial Products and Services, Tiruchirappalli, Tamilnadu, India, for providing the SpinArc GMAW torch facility to conduct welding experiments.