• D. Bahar

Objective of the present work is to optimize the Hardness & Bending strength of a butt joint by analyzing welding process parameters: welding current, welding speed, gas flow rate & root gap in tungsten inert gas (TIG) welding. TIG welding helps in welding of difficult to weld materials (highly reactive materials) and now a days its application has been expanded to various metals like mild steels, stainless steels, and High speed steels etc. In the present work butt joint is created between dissimilar alloys of aluminum (AA5052) and aluminum (AA 6061) with aluminum filler material using Automatic TIG welding machine. Bending strength of butt joint is measured in 3 point bend fixture machine and hardness of butt joint is measured in Rockwell Hardness Testing machine. 16 experiments are performed and L-16 orthogonal array is constructed to design the experiment. Taguchi technique and Grey relational analysis are for optimization in MINITAB software. From the results it is found that welding current has the highest influence on hardness as well as bending strength.

TIG, AA6061, AA5052, bending strength, hardness, Design of experiment (DOE), Taguchi, MINITAB, Optimum, ANOVA, 3 point bend fixture machine.

"Multi objective optimization in tungsten inert gas (TIG) welding using grey relational analysis", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 6, page no.727-736, June-2018, Available :http://www.jetir.org/papers/JETIR1806607.pdf

"Multi objective optimization in tungsten inert gas (TIG) welding using grey relational analysis", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 6, page no. pp727-736, June-2018, Available at : http://www.jetir.org/papers/JETIR1806607.pdf