Abstract—Stainles stel as a weld bead joint has very important aplications in industry. TIG welding is an important joining proces used in manufacturing industries. The major neds in the welding are high tensile strength, god surface finish and hardnes. In order to produce any product with desired quality by welding, proper selection of proces parameters is esential. The review of literature reveals that only few works have ben reported on optimizing the welding of stainles stel. Therefore, this project is aimed at evaluating the optimal proces environment which could simultaneously satisfy the requirements of both quality and strength. In this work Central composite Design Methodology of Response surface methodology is used to conduct the experiments. Analysis of variance is used to analyze the influence of parameters during machining. The results of the present work indicate that welding parameters have signifcant influence on tensile strength, hardnes and penetration. The optimal proces parameters so obtained have ben verifed by confirmatory experiments. In this project TIG welding of stainles stel was studied at diferent values of curent, and electrode diameter but keping electrode material, voltage and welding sped as constant. ATIG welding machine was used to weld 6mm thick stainles stel plates. The photographs of the welded seams were observed and tensile testing of specimens was done to evaluate the mechanical properties of the welded joint.

Index Terms—TIG welding, Response surface methodology, Central composite design, Hardnes, Weld penetration, Tensile strength

Cite: Sreejith S Nair, "Experimental Investigation of Multipass Tig Welding Using Response Surface Methodology," International Journal of Mechanical Engineering and Robotics Research, Vol.2 No.3, pp. 242-254, July 2013.