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All Journal Jurnal Rekayasa Mesin Dinamis Automotive Experiences Sinergi Polmed : Jurnal Ilmiah Teknik Mesin IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Jurnal Polimesin
Abdullah, Ilmi
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Journal : Jurnal Polimesin

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Analysis of mechanical properties, microstructure, and distortion of Al6061-T6 alloys plate using GTA and GMA welding process Suherman, Suherman; Muharnif, Muharnif; Marzuki, Marzuki; Lubis, Yusuf; Pohan, Muhammad Ade syahputra; Aulia, Rakha Ramdan; Ali, Rizki M; Abdullah, Ilmi; Wan Hamzah, Azmi
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6261

Abstract

This study compares the effect of filler metal and welding current of gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) on Aluminium alloy Al6061-T6. Three different filler metals, ER4043, ER4047, and ER5356, were used with the GTAW welding process. The welded joints were created at three different welding currents (120, 130, and 140 A) by the GMAW with filler metals ER5356. Optical and scanning electron microscopy (SEM) is used to analyze the surface fracture of impact test welding joints. The results showed that the GMAW process had the most optimum Ultimate Tensile Strenght (UTS) compared to the GTAW welding joint, especially for welding current 130 A. The impact strength of ER4047 filler metal with the GTAW process is higher than other joints (61 J/cm2). Optimum conditions were obtained by the GMAW welding process using a welding current of 130 A with maximum tensile strength and impact strength of 350 MPa and 53 J/cm2, respectively. SEM analysis showed obtained Mg2Si a globular morphology in ER4047 and ER5356 filler metals, and the dimples fracture is indicated at all joints with the GMAW and GTAW processes. Furthermore, increasing welding current by the GMAW process causes higher angular distortion, reduced vickers hardness but does not significantly affect the weld bead. Overall, the GMAW produces better physical and mechanical properties of weld joint compared to GTAW for all types of filler metals but results in greater angular distortion
Evaluation of diesel engine performance and emissions fueled with waste cooking oil biodiesel-plastic pyrolysis oil blends. Aulia, Amanu; Abdullah, Ilmi; Sebayang, Abdi Hanra
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.v24i1.8611

Abstract

The depletion of petroleum reserves, rising fossil fuel demand, and increasing plastic waste pollution highlight the need for alternative fuels. This study investigated the performance and exhaust emissions of a direct-injection diesel engine fueled with waste cooking oil biodiesel blended with plastic pyrolysis oil at concentrations of 5%, 10%, 15%, and 20% (B+A5 to B+A20). Biodiesel was produced through degumming, esterification, and transesterification, while plastic pyrolysis oil was obtained via thermal cracking. Engine tests under a constant load across a range of engine speeds evaluated brake power, brake-specific fuel consumption (BSFC), brake thermal efficiency (BTE), and exhaust emissions. The results indicate that increasing the proportion of plastic pyrolysis oil improved engine performance compared to pure biodiesel. The B+A20 blend provided the best overall performance, with 44.4% higher power output, 39.6% higher BTE, and 30% lower BSFC than biodiesel, although performance remained below conventional diesel. Regarding emissions, B+A20 reduced CO by 16.3% relative to biodiesel and slightly reduced CO₂ (1%), while NOx increased by 59.7%, highlighting a trade-off between improved performance and NOx control. Overall, blending waste cooking oil biodiesel with plastic pyrolysis oil enhances renewable fuel performance and valorizes plastic waste, but further measures are needed to mitigate NOx emissions.
Co-Authors Abdi Hanra Sebayang Ali, Rizki M Andiko, Rendi Arridina Susan Silitonga - Aulia, Amanu Aulia, Rakha Ramdan Farel H. Napitupulu Hamzah, Wan Azmi Wan Hendri Budi Kurniyanto Himsar Ambarita Jufrizal Jufrizal Kurniawan, Rendy Lubis, Yusuf M. Sabri MARIA BINTANG Marzuki Marzuki Mawardi Muchsin Harahap Muhammad Sabri Muharnif M Muktar, Muharnif Nasution, Arjanggi Nur, Taufiq Bin Pohan, Muhammad Ade syahputra Sai'in, Ali Siahaan, Enzo W.B Simanjuntak, Janter Pangaduan Suharlan, Didy Suherman Suherman, Suherman Suroso, Bekti Surya Darma Surya Dharma Tarigan, Dicky Adrian Sera Tulus Burhanuddin Sitorus Wan Hamzah, Azmi Yudanto, Bagus Giri Yusfiani, Marnida