EFFECT OF PROCESS PARAMETERS ON TENSILE STRENGTH IN GAS METAL ARC WELDED JOINTS AA7075-T6 ALUMINUM ALLOY BY USING REGRESSION AND RESPONSE SURFACE MODEL

Sivashanmugam.M, Arun Kumar K, KajaBanthaNavas R, Essam Ahamed M.A

Abstract: Aluminum and its alloys have been used in recent times due to their light weight, moderate strength and good corrosion resistance. Aluminum alloy 7075-T6 has been researched upon especially as a potential candidate for aircraft material. This alloy is difficult to weld using conventional welding techniques like GTAW and GMAW. An attempt has been made in this paper to weld 7075-T6 alloy using GMAW with argon as a shielding gas. The welding experiment was carried out on Odor, Chennai and tensile strength tested on Ministry of Micro and small and Medium Enterprises Testing Center, Government of India, Chennai for the purpose of improving tensile strength. In order to formulate the equation between important welding parameters like current (I), Voltage (V), Welding Speed (WS) and Gas flow (GS) (predictors) and tensile strength (response) so that multiple regression as chosen and validated this model SPSS 16 and formulated the transfer function with interaction between predictors reported by Minitab 15.

Keywords: AA 7075 aluminum alloy, Gas Metal arc welding, Regression Model, Response Surface model

DOI: https://doi.org/10.15623/ijret.2014.0302029