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<p>The research investigates the impact of several combinations of shielding gases—Argon, Helium, and CO2as well as various filler feed rates and current on weld bead shape during MIG welding of SS304 and EN8 mild steel. Bead height and width were compared in varying process conditions, by different CO2 level, feed rate and current. The findings show that the shielding gas consisting of 10%of CO2 and 90% Ar-Hemixture, feed rate of 2&#xa0;mm and 100&#xa0;A considerably improves bead height. However, a mixture of 15% CO2 and 85%Ar- He with the feed rate of 3&#xa0;mm and a current of 100&#xa0;A results in wider bead width. The percentage of CO 2 was adjusted between 10 and 20% and the rest of the mixture was adjusted as Argon and Helium. Normal probability plots of bead geometry (bead height and bead width) residuals showed that the error was tightly clustered around the reference line indicating that the errors were normally distributed and the regression models were valid. These results will be important in understanding how the choice of shielding gas composition and process parameters are selected to attain desirable weld bead, width properties for manufacturing of Pressure vessels automotive applications.</p>

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Influence of mixture on Argon/Helium/Co2 gases on the properties of MIG welding for SS304 and EN8 steel joint

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • K. Pravinkumar,
  • V. Palani Bharathi,
  • F. Jose Vasantakumar,
  • V. R. Muruganantham,
  • R. Subbiah

摘要

The research investigates the impact of several combinations of shielding gases—Argon, Helium, and CO2as well as various filler feed rates and current on weld bead shape during MIG welding of SS304 and EN8 mild steel. Bead height and width were compared in varying process conditions, by different CO2 level, feed rate and current. The findings show that the shielding gas consisting of 10%of CO2 and 90% Ar-Hemixture, feed rate of 2 mm and 100 A considerably improves bead height. However, a mixture of 15% CO2 and 85%Ar- He with the feed rate of 3 mm and a current of 100 A results in wider bead width. The percentage of CO 2 was adjusted between 10 and 20% and the rest of the mixture was adjusted as Argon and Helium. Normal probability plots of bead geometry (bead height and bead width) residuals showed that the error was tightly clustered around the reference line indicating that the errors were normally distributed and the regression models were valid. These results will be important in understanding how the choice of shielding gas composition and process parameters are selected to attain desirable weld bead, width properties for manufacturing of Pressure vessels automotive applications.