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Safira Ma'asya
Universitas Riau Kepulauan
Aerospace Engineering Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering

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Effect of CO₂ and Argon Gas Shielding on GMAW Welding Joint Quality Safira Ma'asya; Muhammad Alfharizi; Togu Julianman Manullang; Andrean Bastian Tawaris; Fardin Hasibuan; Muhammad Irsyam
METALOGRAM Metalogram Vol.2 No.2 (April, 2026)
Publisher : Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/mtlg.v2i2.7866

Abstract

This study aims to evaluate the effect of shielding gas types, namely carbon dioxide (CO₂) and argon, on the quality of welded joints in the Gas Metal Arc Welding (GMAW) process with low carbon steel as the base material. The research method was carried out experimentally using a steel plate measuring 150 mm × 75 mm × 6 mm and an ER70S-6 electrode wire with a diameter of 1.0 mm. The welding process was carried out with an inverter-type GMAW machine using fixed parameters: 120 ampere current, 22 volt voltage, 4 mm/s welding speed, 12 mm stick-out distance, and 15 liters per minute shielding gas flow rate. The specimens were divided into two groups based on the shielding gas, namely pure CO₂ and pure argon. Evaluation of the joint quality was carried out through tensile tests, Vickers hardness tests on three main zones (weld metal, heat affected zone, and base metal), as well as microstructure and visual observations. The results showed that the specimens with argon gas had a higher average tensile strength (460 MPa) than CO₂ (420 MPa). The hardness values were also higher and more even in the argon specimens, with a finer and more uniform microstructure. In conclusion, the use of argon produces welds with better mechanical and metallurgical qualities than CO₂. Therefore, argon is more recommended for welding low carbon steels that require high strength and precision.
Effectiveness Analysis of An Acid-Based Commercial Cleaner (Harpic) and A Corrosion Inhibitor (Wd-40) on A Motorcycle Fuel Tank Aminuddin Aminuddin; Safira Ma'asya; Tri Tunggal SB; Muhammad Alfarizhi; Fardin Hasibuan
METALOGRAM Metalogram Vol.02 No.3 (August,2026)
Publisher : Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/mtlg.v2i3.7856

Abstract

Corrosion in steel fuel tanks is a common problem that can impair engine performance. This study aims to evaluate the effectiveness of a low-cost restoration method on a severely corroded motorcycle tank. The methodology employed was a case study with a sequential application: a 72-hour immersion in a hydrochloric acid-based cleaner (Harpic) to dissolve iron oxides, followed by the application of a water-displacing corrosion inhibitor (WD-40) as a temporary protectant. Effectiveness was evaluated through comparative visual inspection at each stage of the process. The observational results show that this method successfully removed the majority of corrosion products (rust) and restored the base metal surface. The application of the corrosion inhibitor proved effective in preventing the occurrence of flash rust over a one-week observation period. With a total cost of approximately $9.50 USD, this method offers 90%+ cost savings compared to tank replacement. It is concluded that this combination of commercial products offers a functional and affordable solution for short-term restoration and protection, with the key caveats that the evaluation is qualitative and the protection is not permanent.
Co-Authors Aminuddin Aminuddin Andrean Bastian Tawaris Fardin Hasibuan Muhammad Alfarizhi Muhammad Alfharizi Muhammad Irsyam Togu Julianman Manullang Tri Tunggal SB