Abstract
This paper investigates the correlation between welding parameters and bead geometry of 3F fillet joint welded by GMAW in downhill position. The consumable is ER70S-6 1.2mm solid wire and shielded by Carbon Dioxide. Articulated welding robot performs the welding of 6mm carbon steel T-joint coupons. The welding parameters are arc voltage, welding current and welding speed, while the wire extension is set at constant at 13mm. Only quality welded coupons are selected, they are macro-etched to inspect the quality and measure the bead geometry. The experimental results are tabulated; the correlations between the bead geometry and welding parameter are displayed graphically. Mathematical formulas are developed to match the graphical profiles. A calculator is developed to display the values of weld bead geometry for any value of welding parameter and vice versa. The deviation between predicted weld bead geometry and actual experimental record is less than 1.0mm, it is validated as accurate.
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