It is important to set up the proper modeling of welding processes and process parameters to attain good mechanical properties of welded joint, which are directly or indirectly controlled by a number of welding parameters. In this research work, a statistical modeling of the gas metal arc (GMA) welding of 6061-T6 Al-alloys was done using response surface methodology (RSM). The analysis considered three levels of three factors (welding current, voltage & gas flow rate) and two responses (tensile strength and weld hardness). The experimental design was based on central composite rotable design with full replication. The results indicate that the proposed models predict the responces adequately as the percentage of error is in good agreement.

Keywords: GMA welding, 6061-T6, Modeling, RSM.