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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Teknik Industri Terintegrasi (JUTIN)
Johan Alfian Pradana
Politeknik Driyorejo
Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Effect of T6 Heat Treatment on Tensile Strength and Hardness of A356 Aluminum Alloy at 720°C Optimization: Pengaruh Perlakuan Panas T6 terhadap Kekuatan Tarik dan Kekerasan Paduan Aluminium A356 pada Optimasi Suhu 720°C Wawan Budi; Johan Alfian Pradana; Bamban Handriyanto; Nazri Syah Rizan; Saiful Rowi; Ahmad Bazi Syarif
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1835

Abstract

This study aims to analyze the effect of T6 heat treatment on the mechanical properties of A356 aluminum alloy to determine the optimal processing condition. A356 aluminum is widely used in the automotive industry; however, its as-cast condition exhibits limited strength, requiring improvement through heat treatment processes. The research method involves varying T6 treatment temperatures at 690°C, 720°C, and 750°C, followed by tensile testing, hardness testing, and ANOVA statistical analysis. The results show that T6 treatment significantly improves mechanical properties compared to the as-cast condition, with the highest ultimate tensile strength of 28.3 kg/mm² achieved at 720°C. Hardness also reaches its maximum value at this temperature. However, increasing the temperature to 750°C leads to a decline in mechanical properties due to gas porosity formation that degrades microstructural integrity. ANOVA analysis confirms a significant effect of temperature on hardness (F = 287.300; p < 0.001). Therefore, 720°C is identified as the optimum condition for enhancing the mechanical performance of A356 alloy through T6 heat treatment.
Optimizing Wood Pellet Production Through OEE and Supply Chain Engineering Mohamad Fauzin Abdulloh; Johan Alfian Pradana; Rohmat Al Qusyairi
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 3 (2026): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i3.59977

Abstract

Efficient wood pellet production requires integrated management of machine performance and supply chain operations. PT Rafansa Sukses Sejahtera faces operational challenges, including machine downtime, inconsistent output, and defective products, caused by upstream issues such as delayed raw material supply, varying wood quality, and non-uniform particle size or moisture content. These factors disrupt lead times, reduce throughput, increase waste, and increase safety stock. This study analyzes machine performance using OEE, identifies production root causes through the 6M RCA, and evaluates supply chain indicators including lead time, throughput, waste, bottlenecks, and safety stock. Data were collected over six consecutive days using direct observation and expert judgment. Results showed OEE of 73.6–75.2%, downtime of 58–62 minutes, throughput of 845–855 kg/day, and waste of 5.54–5.59%. The RCA highlighted human, machine, material, method, measurement, and environmental factors as the main constraints. This study proposes an integrated OEE–RCA–supply chain framework to improve efficiency, reduce waste, and strengthen the resilience of the wood pellet supply chain.
Co-Authors Ahmad Bazi Syarif Bamban Handriyanto Mohamad Fauzin Abdulloh Nazri Syah Rizan Rohmat Al Qusyairi Saiful Rowi Wawan Budi