Title: Influence of superimposition of high frequency current to CC-GTAW and PC-GTAW welding producing superior characteristics of weld joints of SDSS

Authors: Rajeev Kumar; Somnath Chattopadhyaya; B.P. Agarwal; Sanjeev Kumar; K. Devakumaran

Addresses: Department of Mechanical Engineering, IIT (ISM) Dhanbad, Jharkhand, 826004, India ' Department of Mechanical Engineering, IIT (ISM) Dhanbad, Jharkhand, 826004, India ' School of Mechanical Engineering, Galgotias University, Yamuna Expressway, Greater Noida, 201310, U.P., India ' Department of Mechanical Engineering, Krishna Engineering College, Ghaziabad, U.P., India ' Welding Research Institute, BHEL, Tiruchirappalli, Tamil Nadu-620014, India

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.

Keywords: constant current gas tungsten arc welding; CC-GTAW; pulse current gas tungsten arc welding; PC-GTAW; current gas tungsten arc welding with superimposed high frequency current; CC-GTAWHF; pulse current gas tungsten arc welding with superimposed high frequency current; PC-GTAWHF; pitting corrosion resistance; gas tungsten arc welding; GTAW.

DOI: 10.1504/IJMPT.2021.118354

International Journal of Materials and Product Technology, 2021 Vol.63 No.4, pp.262 - 290

Received: 13 Oct 2020
Accepted: 25 Mar 2021
Published online: 22 Oct 2021 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article