Research Article InvestigationoftheTIGWeldingProcessforJoiningAA6082Alloy Using Grey Relational Analysis G.SathishKumar, 1 M.Ramesh, 2 S.Dinesh, 1 PrabhuParamasivam , 3 andN.Parthipan 4 1 Department of Mechanical Engineering, K. Ramakrishnan College of Technology (Autonomous), Kariyamanikam Road, Samayapuram, Tiruchirappalli, Tamilnadu 621112, India 2 Department of Mechanical Engineering, K. Ramakrishnan College of Engineering (Autonomous), Kariyamanikam Road, Samayapuram, Tiruchirappalli, Tamilnadu 621112, India 3 Department of Mechanical Engineering, College of Engineering and Technology, Mettu University, 318, Metu, Ethiopia 4 Department of Mechanical Engineering, M.Kumarasamy College of Engineering, alavapalayam, Karur 639113, India Correspondence should be addressed to Prabhu Paramasivam; drprabhu@meu.edu.et Received 9 November 2021; Revised 23 December 2021; Accepted 3 January 2022; Published 25 January 2022 Academic Editor: Fuat Kara Copyright © 2022 G. Sathish Kumar et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. e goal of this project is to find optimization parameters in the TIG weld bead. To ensure the success of this research project, a semiautomatic TIG was developed. Samples are made in a single bead on top of a substrate (base metal) in a horizontal position. Aluminum 6082 is used as the substrate, and AA5356 filler wire with a diameter of 2.4 mm is used as the filler wire. is research project employs argon as the shielding gas. Welding current (A), travel speed (mm/min), and gas flow rate (lit/min) have all been identified as influencing parameters for welding. e Taguchi orthogonal array L9 (Minitab 19) was used to calculate the amount of runoff and analyze the samples. Tensile and hardness tests were performed on the welded samples. According to the test results, as the current value increases, the tensile strength and the hardness values decrease. As a result of this experiment, it is possible to conclude based on grey relational analysis that the best parameters for welding Al 6082 alloy are 150 A of welding current, 200 mm/min of travel speed, and a gas flow rate of 14 lit/min. 1.Introduction e process that facilitates the joining of different materials such as metals, plastics, and alloys through controlled heat under pressure or nonpressure conditions is called welding. On application of controlled heat at the interface, the ma- terials tend to melt initially, and a permanent joint is produced after solidifying the melted material at the in- terface [1–4]. e joint may be formed by using flux or filler material depending upon the type of material selected and application of the joint. e GTAW or TIG welding process produces welds with an electrode made of tungsten as shown in Figure 1. e inert gases are widely used to cover the area welded from the atmosphere (helium, argon, or a combi- nation of helium and argon) [5–7]. For proper welding, filler metal can also be fed manually. GTAW, also known as the TIG welding process, was invented during World War II. e joining of harder-to-join materials, such as aluminum and magnesium, has become likely with the advancement of the TIG welding process. Welding thick aluminum alloy plates can be accomplished using a variety of techniques [8–11]. However, arc welding, such as GMAW and TIG welding, is a more cost-effective option due to lower energy consumption and greater flexibility [12]. e formation of pore defects during fusion welding is a significant issue in welding thick plates of Al alloys [13]. Typically, the strength of the TIG welded joint of AA 6082 has been higher than the joint obtained with MIG welding. e tensile strength was higher due to the better equal-sized grain structure due to the narrow spacing arms. Also, the travel speed of the electrode directly influences the phenomenon of softening in the area of the weld. e hardness at the weld has been increased through aging under 0 ° C [14]. With two different filler materials, AA 4043 and AA 4047, a double side V butt weld joint was created. When the current increases from 80 Amp to 120 Amp, the tensile Hindawi Advances in Materials Science and Engineering Volume 2022, Article ID 5670172, 8 pages https://doi.org/10.1155/2022/5670172