In this investigation the effect of GTA welding parameters on bead geometry of SAF 2507 Super Duplex Stainless Steel were studied. Single pass autogenous square butt joints were made on 6 mm thick plate. Taguchi L16 Orthogonal experimental design is used to optimize the process parameters. Arc Current, Welding Speed, Shielding Gas Flow Rate and Arc Gap are the input process parameters, while the aspect ratio and the depth of penetration are the responses considered. The micro structural image analysis is used to measure the bead geometry parameters such as aspect ratio and the depth of penetration. From this investigation it is found that the Arc current and Welding speed are the dominant and significant process parameter which affects the bead geometry of the joints. Regression equations have been derived to predict the depth of penetration and aspect ratio of GTA weld beads on 2507 Super Duplex Stainless Steel.
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