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All Journal Jurnal Rekayasa Mesin Indonesian Journal of Engineering and Science (IJES)
Nurhabibah Paramitha Eka Utami
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS CACAT PENYUSUTAN DAN NILAI KEKERASAN PRODUK COR ALUMINIUM SKRAP DENGAN VARIASI UKURAN MILD STEEL CYLINDER MOLD Nurhabibah Paramitha Eka Utami; Pratiwi, Diah Kusuma; Chandra, Hendri; Ellyanie, Ellyanie; Gustini, Gustini; Astuti, Astuti
Jurnal Rekayasa Mesin Vol. 25 No. 1 (2025): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v25i1.1414

Abstract

The research was conducted to investigate the effect of mold diameter variation on the hardness and shrinkage of cast products made from aluminum scrap. Three mold diameter variations were used in the casting process: 50 mm, 70 mm, and 100 mm. The testing methods included shrinkage measurement, Brinell hardness testing, and dye penetrant inspection. The test results showed that the 50 mm sample had the highest hardness value of 52.09 BHN and the lowest shrinkage defect of 25.25%, while the 100 mm diameter sample exhibited the lowest hardness value of 48.72 BHN and the highest shrinkage defect of 28%. This phenomenon occurred due to differences in cooling rates during the solidification process, where larger mold diameters experienced slower cooling, resulting in coarser microstructure grains and a higher occurrence of shrinkage defects.
MICROSTRUCTURAL EVOLUTION AND MECHANICAL PERFORMANCE OF SMAW DISSIMILAR WELDS BETWEEN ASTM A36 AND AISI 316 WITH E316-16 ELECTRODE AT DIFFERENT WELDING CURRENTS Nurhabibah Paramitha Eka Utami; Chandra, Hendri; Pratiwi, Diah Kusuma; Ellyanie, Ellyanie; Astuti, Astuti; Prastyanto, Wisnu Hafiz; Riady, Muhammad Ihsan; Santoso, Dyos; Saputra, M. A. Ade
Indonesian Journal of Engineering and Science Vol. 6 No. 3 (2025): Table of Contents: In progress
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v6i3.201

Abstract

This study investigates the effect of welding current on the microstructural evolution and mechanical performance of Shielded Metal Arc Welded (SMAW) dissimilar lap joints between ASTM A36 carbon steel and AISI 316 stainless steel using an E316-16 electrode. Welding was performed at three different currents, namely 60 A, 70 A, and 80 A, to evaluate their influence on microstructure, hardness distribution, and impact toughness. Microstructural characterization was conducted using optical microscopy to examine phase formation and grain morphology in the weld metal and heat-affected zone (HAZ). Mechanical properties were evaluated through Vickers hardness testing and Charpy impact testing. The results show that increasing welding current leads to higher heat input, promoting the formation of finer pearlite and acicular ferrite in the weld metal, along with an expansion of the HAZ. These microstructural changes resulted in increased hardness, with the highest average hardness value of 343.32 HV observed in the weld metal at 80 A. Impact test results indicated that higher welding currents enhanced impact toughness due to the interlocking morphology of acicular ferrite, which effectively retards crack propagation. However, localized grain coarsening was observed near the fusion boundary, particularly within the HAZ. Overall, a welding current of 80 A provided the most favorable combination of hardness and impact toughness, indicating its suitability for optimizing the mechanical performance of SMAW dissimilar welded joints between ASTM A36 and AISI 316.
Co-Authors Astuti - Diah Kusuma Pratiwi Dyos Santoso Ellyanie Ellyanie Gustini, Gustini Hendri Chandra Prastyanto, Wisnu Hafiz Riady, Muhammad Ihsan Saputra, M. A. Ade