REA Press Null REA Press3042-31043042-3104 REA Press https://doi.org/10.48314/apem.vi.45 Research Article Weld parameters, Optimization, Taguchi relational analysis, Metal inert gas welding. Influence of Welding Parameters on the Strength of Metal Inert Gas-Welded Mild Steel Joints Influence of Welding Parameters on the Strength of Metal Inert Gas-Welded Mild Steel Joints Washington Odhiambo Obura Department of Mechanical and Mechatronics Engineering, Faculty of Engineering, Multimedia University of Kenya, Nairobi, Kenya. Abel N. Mayaka Department of Mechanical and Mechatronics Engineering, Faculty of Engineering, Multimedia University of Kenya, Nairobi, Kenya. Charles Ondieki Department of Mechanical and Mechatronics Engineering, Faculty of Engineering, Multimedia University of Kenya, Nairobi, Kenya. 10 2025 23 10 2025 2 4 © 2025 REA Press 2025

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 Influence of Welding Parameters on the Strength of Metal Inert Gas-Welded Mild Steel Joints

Metal Inert Gas (MIG) welding is a type of arc welding that uses a continuous solid wire electrode and a shielding gas to join two metals by heating them with an electric arc. We studied process parameters including current, voltage, preheat temperature, and post-weld heat treatment. We optimize process parameters of experiments done in previous work using a Taguchi Orthogonal Array (L27) design. A grey-based Taguchi method is used to optimize the process parameters. The Analysis of Variance (ANOVA) is applied to assess the significance of the input parameters on the response parameters. A mathematical model is developed using Multiple Linear Regression (MLR) equations. The results of this research show that it is possible to achieve higher strengths in weld joints using Taguchi design. We also find that increasing current (I) and Post-Weld heat Treatment (PWT) temperature increases the strength of the studied welded joints, and vice versa. Future research should validate the findings of the current study through experimental investigations.

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