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All Journal Jurnal Optimalisasi Jurnal Teknik Industri Terintegrasi (JUTIN) Journal of Engineering Science and Technology Management Jurnal Polimesin Journal of Green Engineering for Sustainability JES-TM Social and Community Service Jurnal Keilmuan dan Aplikasi Teknologi Industri
Putra, Rama Dani Eka
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Journal : Jurnal Polimesin

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Effect of nitrogen gas-assisted cooling on TIG weld distortion and mechanical properties of AA5083 aluminum alloy Hanggara, Fuad Dwi; Putra, Rama Dani Eka; Fitri, Tessa Zulenia; Nugroho, Handi Wilujeng; Prayogo, Dhanang Suryo
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7910

Abstract

This study investigates the effect of nitrogen gas-assisted static cooling on weld distortion and mechanical properties of AA5083 aluminum alloy joined by Tungsten Inert Gas (TIG) welding. Although various cooling techniques have been reported to control heat input and distortion in aluminum welding, the combined influence of static nitrogen cooling and welding current on both distortion behavior and local mechanical properties of AA5083 remains insufficiently understood. Three welding current levels (100 A, 110 A, and 120 A) were applied while maintaining constant welding speed, arc voltage, and shielding gas flow. Mechanical properties, including tensile strength and Vickers hardness, were evaluated across the weld metal, Heat-Affected Zone (HAZ), and base metal. Thermal-induced distortion was analyzed using 3D profiling and validated through Analysis of Variance (ANOVA) statistical tests. The results indicate that a welding current of 100 A with static nitrogen cooling minimizes distortion and achieves the highest tensile strength (197.41 MPa). The highest yield strength was recorded at 120 A (160.31 MPa), while the maximum hardness values were observed in the weld metal at 110 A (135.83 VHN), HAZ at 120 A (117.63 VHN), and base metal at 100 A (124.1 VHN). Statistical analysis confirms that welding current significantly influences both distortion and mechanical outcomes (p 0.05), while the cooling method shows a moderate effect. These findings demonstrate that nitrogen-assisted static cooling offers a practical approach to improving weld quality by balancing dimensional stability and mechanical performance in precision aluminum welding applications.
Design, simulation, and experimental validation of a 50 kg biomass-fired coffee drying oven Nuramal, Agus; Jaya, Efran Riansyah Rahmat; Suryadi, Dedi; Zuliantoni1, Zuliantoni; Hardiansyah, Hardiansyah; Putra, Rama Dani Eka
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8603

Abstract

Despite coffee is one of the leading commodities in Bengkulu Province, the traditional drying process of coffee beans for 10-14 days are still a common practice. This research aims to design, fabricate, and evaluate the thermal performance of a 50 kg capacity wood-fueled coffee drying oven. A three-dimensional CFD model was developed using ANSYS Fluent to analyze temperature distribution within the drying chamber and optimize thermal performance prior to fabrication. Experimental testing was conducted to validate the numerical predictions under controlled operating conditions. The proposed technology is distinguished by its use of locally available biomass fuel. The results of the coffee drying oven simulation, under empty conditions, achieved the desired temperature based. The drying time for coffee beans in this research was 9 hours, achieving a moisture content of 10% to 13% (a moisture content of 12.5% is the Indonesian National Standard. Simulation results predicted chamber temperatures ranging from 67°C to 87°C with an inlet temperature of approximately 100°C, indicating adequate thermal conditions for drying. Experimental measurements showed good agreement with the CFD model, reaching near-steady thermal conditions within 25 minutes.
Co-Authors Adicita, Yosef Agus Nuramal Ari Wibowo Brillianio, Nindya Nuanda Ardha Dedi Suryadi Erin Alawiyah Siregar, Erin Alawiyah Fitri, Tessa Zulenia Foci, Nia Arfina Fuad Dwi Hanggara Hakim, Abdul Hamid Hardiansyah Hardiansyah Helmizar Jaya, Efran Riansyah Rahmat Kurniadi, Deri Matondang, Irwan Zulfikri Munanda, M Arif Munanda, M. Arif Nugroho Pratomo Ariyanto Nugroho, Handi Wilujeng Nurul Laili Arifin Nurul Ulfah Prayogo, Dhanang Suryo Roza Puspita Sartika, Syifa'a Yasin, Muhamad Yenni Kurniawati Zuliantoni1, Zuliantoni