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All Journal Rotasi Metal Indonesia Turbo : Jurnal Program Studi Teknik Mesin Scientific Journal of Mechanical Engineering Kinematika MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Journal of Metallurgical Engineering and Processing Technology Journal of Mechanical Engineering Jurnal Rekayasa Energi dan Mekanika Journal of Mechanical Design and Testing (JMDT) Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Journal of Applied Mechanical Technology (JAMET) Journal of Sciencce Technology and Visual Culture
Eko Pujiyulianto
Program Studi Teknik Mesin, Institut Teknologi Sumatera (ITERA)
Aerospace Engineering Arts Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Time Variations in the Pure Aluminium Anodization Process Paundra, Fajar; Irfan, Angga; Sidik, M.farhan; Pujiyulianto, Eko; Nurdin, Akhmad
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.72-77

Abstract

Aluminium is a white non-ferrous metal and is easily oxidized. In the industrial world, aluminium was chosen because it has the advantages of light density, corrosion resistance, easy fabrication (forged), high thermal and electrical conductivity. However, aluminium also has disadvantages, namely having a low hardness value when compared to steel. Pure aluminum hardness is only around 50 VHN. Therefore anodizing is expected to improve the hardness value of aluminium. This study aims to determine the effect of time variation on the value of changes in mass, hardness, oxide layer thickness, and microstructure. This study used aluminium 1100 with a time variation of 60, 70, 80, and 90 minutes, a concentration of H2SO4 of 10%, a current density of 6 A and a voltage of 20 V. The results of the study using a time variation of 60, 70, 80 and 90 minutes obtained the change in value the smallest mass occurred at 60 minutes of 0.4 g and the largest occurred at 90 minutes of 1.09 g. The smallest hardness value occurred at 60 minutes at 72.8 VHN and the highest occurred at 90 minutes at 86.7 VHN. The lowest layer thickness value occurred at 60 minutes of 7.96 µm and the highest occurred at 90 minutes of 10.79 µm
PENGARUH PENGGUNAAN MAGNET EKSTERNAL DAN VARIASI ARUS PADA PENGELASAN TIG TERHADAP STRUKTUR MIKRO KEKERASAN DAN KEKUATAN TARIK BAJA KARBON RENDAH Paundra, Fajar; Yudanta, Faturrizky Rakha; Muhyi, Abdul; Pujiyulianto, Eko; Syanur, Farid Nanda; Darsono, Febri Budi
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 2 (2024): Edisi Agustus
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v5i2.1561

Abstract

Medan magnet eksternal dapat meningkatkan kualitas dari hasil pengelasan TIG. Penelitian ini bertujuan untuk mengetahui pengaruh medan magnet eksternal dalam proses pengelasan TIG. Material yang digunakan dalam penelitian ini adalah baja SS400. Proses pengelasan menggunakan TIG (Tungsten Inert Gas)  dengan variasi arus 70 A, 80 A, 90 A, dan 100 A serta menggunakan tambahan 2 magnet eksternal jenis Neodymium. Pengujian hasil pengelasan berupa struktur makro, mikro, uji kekerasan vickers dan uji tarik. Hasil pengujian struktur makro menunjukan beberapa cacat hasil pengelasan seperti Porositas, Incomplete Penetration, Underfill, dan Distorsi. Sedangkan hasil pengujian struktur mikro menunjukan pada base metal terdapat struktur jenis Ferrite dan Pearlite. Bagian HAZ terdapat struktur jenis Ferrite, Pearlite, dan Martensite. Hasil pengujian tarik paling tinggi terdapat pada sambungan pengelasan TIG tanpa menggunakan magnet dengan arus 100 A yaitu sebesar 368,234 MPa. Hasil pengujian kekerasan paling tinggi terdapat pada sambungan pengelasan TIG menggunakan magnet dengan arus 100 A yaitu sebesar 176,712 HVN. Penggunaan magnet eksternal dapat menghasilkan penetrasi besar saat proses pengelasan dan mengahasilkan sambungan las yang baik. Sebaliknya, hal tersebut dapat berakibat buruk terhadap hasil pengelasan jika jarak busur listrik dengan material tidak tepat, dan torch tidak bergerak sesuai pada jalur pengelasan.
EVALUASI UMUR SISA SHELL COOLER CL-5 DENGAN METODE FITNESS FOR SERVICE-1/API 579 Pujiyulianto, Eko; Wardono, Herry; Sukmana, Irza; Hutama, Saka Mahidaya; Paundra, Fajar
Scientific Journal of Mechanical Engineering Kinematika Vol 8 No 2 (2023): SJME Kinematika Desember 2023
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v8i2.273

Abstract

This research aims to evaluate the remaining life of the CL-5 shell cooler using the fitness for service method (FFS-1/API 579). The evaluation is conducted through the inspection process of components using Non-Destructive Testing (NDT) methods. This study is aimed at identifying thickness changes, analyzing the types of corrosion occurring in the CL-5 shell cooler, calculating the minimum allowable shell thickness, determining the Maximum Allowable Working Pressure (MAWP), estimating the corrosion rate, assessing the remaining life, and determining the operational feasibility of these components. Calculations are performed using the FFS-1/API 579 standard. The research results indicate that the total loss in 2011 and 2021 was 0.2 mm and 0.414 mm, respectively. The corrosion rates observed on the CL-5 shell cooler in 2011 and 2021 were 0.067 mm/year and 0.13 mm/year. Based on the minimum thickness and MAWP values evaluation, the CL-5 shell cooler is still fit for operation. Analysis of the remaining life of the CL-5 shell cooler indicates that the remaining life in 2011 and 2021 was 7.81 years and 6.83 years, respectively. Based on the above description, it can be concluded that the CL-5 shell cooler can still be operated.
Analisis Penggunaan Limbah Resin Coated Sand sebagai Substitusi pada Cetakan Greensand Terhadap Karakteristik Pengecoran Logam Aluminium Nurdin, Akhmad; N, Muhammad Dwi; S, Ardi Bagus; Paundra, Fajar; Muhyi, Abdul; Pujiyulianto, Ekko; K, Putra Andi; N, Fajar Perdana; S, Farid Nanda; D, Febri Budi
Jurnal Rekayasa Energi dan Mekanika Vol 4, No 1 (2024): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v4i1.25

Abstract

Resin Coated Sand atau RCS  salah satu jenis cetakan yang digunakan untuk proses pengecoran logam dan menghasilkan limbah yang mengandung resin. Sebagian besar limbah RCS  masih dapat  didaur ulang, karena masih mengandung pasir silika dan berukuran lebih kecil dibandingkan pasir silika untuk cetakan greensand. Cetakan greensand terdiri dari pasir silika dengan pengikat merupakan cetakan pasir yang sering digunakan pada industri pengecoran logam. Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh penambahan limbah pasir RCS pada cetakan greensand terhadap karakteristik kekerasan dan struktur mikro pada peleburan ulang aluminium-silikon. Penelitian ini dilaksanakan untuk mendapatkan data pada komposisi limbah cetakan pasir RCS dengan presentase 0%, 20%, dan 40% terhadap pasir baru grendsand, sedangkan material logam aluminium yang digunakan pada penelitian ini mengunakan limbah sepatu rem tromol sepeda motor. Hasil pengecoran logam didapat spesimen logam aluminium yang diuji kekerasan dan metalografi. Pada penambahan RCS 20% menunjukkan nilai kekerasan yang cenderung sama pada penambahan 0%, namun nilai kekerasan akan naik 2,4 kali pada penambahan RCS 40%. Berdasarkan pengujian metalografi penambahan RCS 40% menunjukkan struktur fasa Si yang cenderung lebih meluas dibandingkan pada penambahan 0% dan 20%.
Simulation Study of Pin-Type Heatsinks on Convection Heat Transfer Characteristics in Electronic Devices Chaniago, Noverto Zhorif; Alfian, Devia Gahana Cindi; Syaukani, Muhammad; Pujiyulianto, Eko; Nurullah, Fajar Perdana; Silitonga, Dicky Januarizky
ROTASI Vol 26, No 4 (2024): VOLUME 26, NOMOR 4, OKTOBER 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.4.47-53

Abstract

Electronic components are components that require an optimal design in order to provide good heat release performance. The heat sink component is a relevant solution to help cool an electronic component by flowing heat energy into the environment either naturally or forcibly with the help of a fan. The purpose of this study is to determine the effect of material type on heat sink temperature distribution, determine the phenomenon of velocity boundary layer and thermal boundary layer that occurs in each heat sink variation, determine the effect of design shape and pin arrangement on pressure drop, determine the best design according to the final results of the study. This research uses 6 variations of design shape, 2 variations of arrangement (inline and staggered), and 3 types of materials (Aluminum, Copper, and Iron). The method used in this research is a simulation method with three stages of process, namely, pre processing, processing, and post processing. The results showed that copper material is the best in conducting heat with a temperature drop of 98.5% from the base temperature. The inline arrangement obtained a lower pressure drop than the staggered arrangement and the best design was obtained by fillet square perforation with an inline arrangement.
Co-Authors Abdu Halim Wibowo Aji, Ahmad Frantoni Amelia Oktavia Auriyani, Wika Atro Chaniago, Noverto Zhorif D, Febri Budi Darsono, Febri Budi Devia Gahana Cindi Alfian Dicky J. Silitonga Fajar Paundra Fajar Paundra Fajar Perdana Nurullah Febri Budi Darsono Firjatullah, Ahmad Labib Fuad Mulkan Al Machzumy H.T. Yudhistira Hadi Teguh Yudistira, Hadi Teguh Herry Wardono Hutama, Saka Mahidaya Imam Prabowo Imam Prabowo Irfan Dafa Denara Irfan, Angga Irza Sukmana, Irza Jukepri Brain Meliala K, Putra Andi Kardo Rajagukguk, Kardo Lathifa Putri Afisna M. Fahan Sidik M. Rafi Kurniawan Muhammad Ichsanudin Muhammad Rizky Hikmatullah Muhammad Syaukani Muhyi, Abdul N, Fajar Perdana N, Muhammad Dwi Nurdin, Akhmad Nurullah, Fajar Perdana Paundra, Fajar Prasetyo, Tri Wahyu Putty Yunesti Ramadhanty, Nabila Rifqi Sufra S Suyitno S, Ardi Bagus S, Farid Nanda Sidik, M.farhan SYANUR, FARID NANDA Vicky F Sanjaya Yudanta, Faturrizky Rakha Yusupandi, Fauzi Zian Millenio Zuhdi Zainul Muttaqin