Abstract
In the present study, effect of welding current was analysed on the microstructural and corrosion properties of 316L austenitic stainless steel (ASS) joints welded by gas tungsten arc welding (GTAW). Three welding current were chosen from the GTAW process's operational range and welded joints fabricate using these currents were exposed to microstructural, microhardness as well as corrosion evaluations. Microstructural examination showed the lathy and vermicular morphology of δ-ferrite in the weld metal microstructures while different degrees of grain coarsening in the HAZ microstructures were seen. DLEPR method was used to assess the welds' resistance to corrosion, which depicted that high welding current specimen revealed relatively higher value of DOS (indicate higher amount of corrosion rate) as compared to low welding current specimen. This was due the fact that vermicular morphology of δ-ferrite was present in the high welding current specimens, which promoted the corrosion rate. However, lathy morphology of δ-ferrite was found in the low welding current specimens, which demotes the corrosion rate.
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