Influence of superimposition of high frequency current to CC-GTAW and PC-GTAW welding producing superior characteristics of weld joints of SDSS Online publication date: Fri, 22-Oct-2021
by Rajeev Kumar; Somnath Chattopadhyaya; B.P. Agarwal; Sanjeev Kumar; K. Devakumaran
International Journal of Materials and Product Technology (IJMPT), Vol. 63, No. 4, 2021
Abstract: The joints are made with UNS32750 super duplex stainless steel plate. The joints are also made by superimposing high frequency current to these welding techniques namely CC-GTAW, constant current gas tungsten arc welding with superimposed high frequency current (CC-GTAWHF), pulse current gas tungsten arc welding (PC-GTAW) and pulse current gas tungsten arc welding with superimposed high frequency current (PC-GTAWHF) respectively. The thermal characteristics and its effects are further correlated to corrosion resistance. The correlation between thermal characteristics and pitting corrosion resistance in all weld joints was established using weight loss method and potentiodynamic polarisation experiment. The effective thermal impact and consequently corrosion rate has been found minimum in PC-GTAWHF. EDS shows that there is reduction in Ni and increase in Mo content in the weld metal which have also an effect on corrosion of weld.
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