Abstract: There are huge applications in stainless steels due to its high corrosion resistance. These are classified into different grades based on its applications. In this study, GTAW of AISI 304 and AISI 316 L with the filler as AISI 304. Welding using ER- 309 as filler material has been reported by the researches earlier, by varying both current and voltage. And also, the current required for minimal heat affected zone was not reported. Hence this study, experiments were conducted using tungsten inert gas (TIG) welding of 304 and 316L stainless steel sheets was carried out with three different current value 25A, 30A and 35A with constant voltage. It was observed that the elongation and yield strength, hardness, and weld width were investigated based on the varying voltage and current. Moreover, in order to examine the mechanical and metallurgical behaviour of the weld, non-destructive evaluation, microstructure, thermal analysis was done. It was observed that strength and toughness of samples increased by increasing current in TIG with voltage as constant. There are zero cracks, porosity, blow holes, spatter found in welding process of plate using non consumable tungsten electrode with argon gas. The study was carried to observe the elongation, yield strength, hardness, and weld width were based on three different current 25A, 30A, and 35A respectively. It was also observed that at high current 35A has less heat affected zone which was analysed by simulation.

Key Words: AISI 316, AISI 316L, Gas Tungsten Arc Welding (GTAW), Mechanical & Thermal properties

| DOI: 10.17148/IARJSET.2021.85109