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All Journal Jurnal Ilmiah Giga Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Science and Technology Indonesia MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Lubi, Ahmad
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Carbon Micron-size Content Dependency in Epoxy/Carbon Composite Coated onto SPCC Plate for Automotive Bodies Protection Anggrainy, Rani; Susetyo, Ferry Budhi; Lubi, Ahmad; Yudanto, Sigit Dwi; Rosyidan, Cahaya; Soegijono, Bambang; Ajiriyanto, Maman Kartaman; Kurniawan, Ova; Nanto, Dwi
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.989-998

Abstract

Conventional epoxy coating for surface metal corrosion protection reported many unsolved technical problems. Adding filler in the epoxy could enhance the promising properties of the composite coating. Our work describes in detail the synthesizing and characterizing epoxy/carbon composite coating. Epoxy was mixed with thinner high gloss (HG) and hardener and stirred using a stirrer apparatus. After blending, various carbons were added (1 wt. %, 3 wt. %, and 5 wt. %) and then appropriately stirred. The different mixture composite was coated onto the steel plate cold rolled coiled (SPCC) plate using high-volume low-pressure (HVLP) in two passes. Various characterizations were performed, including crystallographic orientation, Infra-Red (IR)-spectra, surface morphology, thickness, hydrophobicity, hardness, and corrosion using X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), portable dry film coating thickness (DFT), digital camera, Vickers microhardness tester, and Potentiostat, respectively. More carbon micron-sized content led to elevate the peak intensity, surface bumpiness, and hydrophobicity. The uppermost external bumpiness and hydrophobicity values are 23.51 µm and 101◦. Hardness depends on carbon content and more carbon leads to an increase in the hardness of the composited coating. The highest average Vickers hardness value is 28.24 HV. The coating thickness influenced the corrosion rate, more coating thickness promoted lesser corrosion rate. The highest coating thickness (60.8 µm) promoted a corrosion rate of around 5.65×10−4 mmpy.
APPLICATION OF JIGSAW-TYPE COOPERATIVE LEARNING MODEL TO IMPROVE LEARNING OUTCOMES Anggrainy, Rani; Tresdiawan, Rendi Ardi; Mubarak, Ibnu; Sutia, Iyep; Lubi, Ahmad
Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Vol 9, No 2 (2022): Desember 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jmee.v10i2.52725

Abstract

This study aims to (1) find out the difference in improving student learning outcomes between those who use the jigsaw-type cooperative model and students who use the lecture model, and (2) find out the increase in student learning outcomes   after applying the cooperative learning model with jigsaw type. Metode penelitian yang digunakan adalah metode eksperimental. The experimental method is used to look for a causal relationship between two factors that the researcher deliberately caused. The population in this study was all Class XI students majoring in Motorcycle Business Engineering at one of the State Vocational Schools in Bandung totaling 5 classes. The research samples were taken in two classes, namely one experimental class and one control class, the sampling technique was carried out random sampling cluster. The instruments used are test instruments and obsrvation sheets. The results showed that there was a significant difference between the learning outcomes of students who used a jigsaw-type cooperative model and students who got learning with a lecture model. The average final score of learners using the jigsaw-type cooperative model was higher than those using lectures. The N-Gain value index of the jigsaw type cooperative model category is quite effective and the lecture model of its N-Gain index category is ineffective.Keywords: Learning Model; cooperative; jigsaw; Experimental; N-Gain
RANCANG BANGUN ALAT BANTU PEMOTONGAN SEGI ENAM PADA MESIN BUBUT KONVENSIONAL UNTUK MENINGKATKAN AKURASI DAN EFISIENSI PROSES PRODUKSI Priyanto, Sugeng; Lubi, Ahmad; Anggrainy, Rani; Hari Krisyono , Danar; Muhamad Yusup , Fahmi
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 6 No 03 (2024): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v6i03.163

Abstract

The development of manufacturing technology, including in the field of lathes, continues to progress quite significantly to meet increasingly complex industrial needs. One of the important innovations in lathes was the use of detachable heads, the use of cutting tools in a more flexible and efficient way. Bolts with hexagonal holes are an important component in the automotive world, one of their uses is in motorbike calipers. After conducting a literature study regarding loose heads and drill chucks on lathe machines, the author carried out an evaluation and carried out a design for the design of an internal hexagon rotating tool on a conventional lathe using the Inventor application. Evaluation of the performance of this tool shows that this tool can be relied on for practical and educational applications, and meets the needs of its users which can be seen in the Von Mises Stress simulation results and also the results of tool testing
Efek waktu tahan baja AISI 4140 terhadap struktur mikro, kekerasan, dan korosi Syamsuir; Syaripuddin; Sopiyan; Indriasti, Zulfah; Anggrainy, Rani; Lubi, Ahmad; Susetyo, Ferry Budhi
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.197

Abstract

Baja AISI 4140 merupakan baja paduan menengah yang sering digunakan dalam aplikasi teknik, termasuk pada komponen kapal, karena memiliki kekuatan tinggi dan potensi untuk ditingkatkan sifat mekaniknya melalui perlakuan panas. Penelitian ini bertujuan untuk mengkaji pengaruh variasi waktu tahan pada proses perlakuan panas terhadap perubahan struktur mikro, kekerasan, dan laju korosi baja AISI 4140. Perlakuan panas dilakukan dengan memanaskan spesimen pada suhu 800°C selama 30 menit dan 45 menit, kemudian diikuti proses quenching menggunakan oli SAE 10W-40. Spesimen tanpa perlakuan panas digunakan sebagai pembanding. Struktur mikro diamati menggunakan mikroskop optik Olympus BX51M, kekerasan diuji dengan metode Vickers menggunakan beban 5 kg, dan korosi diuji dengan metode kehilangan berat dalam larutan NaCl 3,5%. Hasil pengamatan menunjukkan bahwa semakin lama waktu penahanan, struktur mikro didominasi oleh fasa martensit yang lebih halus dan homogen. Hal ini berdampak langsung pada peningkatan kekerasan material, di mana spesimen dengan waktu tahan 45 menit menunjukkan nilai kekerasan tertinggi 658,14 HV dibandingkan spesimen lainnya. Nilai laju korosi tertinggi diperoleh Q-30 melalui pengujian selama 96 jam sebesar 38,02 mpy
Effect of Furnace Heating Temperature on the Hardness and Corrosion Resistance of Plain Carbon Steel Sopiyan, Sopiyan; Syaripuddin, Syaripuddin; Syamsuir, Syamsuir; Ansori, Fuad; Hasbi, Muhammad Yunan; Lubi, Ahmad; Susetyo, Ferry Budhi
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 7 No 3 (2025): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/motivection.v7i3.466

Abstract

Microstructure modification of the plain carbon steel usually enhances hardness and corrosion resistance. Therefore, in the present research, the microstructure of plain carbon steel is modified by heating it in an electric furnace using various temperatures and then quenching it in engine oil to enhance corrosion resistance and hardness. Several characterizations were conducted, such as microstructure, hardness, and electrochemical behavior. The microstructure evolution indicates a clear transformation of martensite morphology with decreasing austenitizing temperature. Decreasing the furnace's heating before quenching could increase the specimens' hardness and corrosion resistance, with values around 586.36 HV and 0.135 mmpy. Therefore, the optimal heat treatment condition for plain carbon steel components in marine environments was found at 800 °C based on the results of this study.
Perlakuan Panas Lapisan Hasil Multilapis Hardfacing Dengan Elektroda AWS A5.13 EFe2/A5.1 E7018 Susetyo, Ferry Budhi; Basori, Basori; Lubi, Ahmad
Jurnal Ilmiah Giga Vol 24 No 2 (2021): Volume 24 Edisi 2 Tahun 2021
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v24i2.1238

Abstract

Hardfacing adalah salah satu teknik dalam pengelasan yang berfungsi untuk meningkatkan nilai kekerasan permukaan suatu material. Selain itu untuk meningkatkan kekerasan permukaan dapat juga dilakukan dengan melakukan perlakuan panas pada material. Umumnya hardfacing dilakukan pada material baja karbon rendah, karena baja karbon rendah tidak bisa ditingkatkan kekerasannya dengan perlakuan panas. Untuk itu akan dilakukan kombinasi dari proses hardfacing secara multilapis dan dilanjutkan dengan perlakuan panas dengan tujuan untuk mendapatkan kekerasan lapisan yang optimum. Metodologi dalam penelitian ini adalah akan dilakukan pengelasan hardfacing secara multipis dimana lapis pertama dengan elektroda AWS A5.13 EFe2, lapis kedua dengan elektroda AWS A5.1 E7018 dan lapis ketiga dengan elektroda AWS A5.13 EFe2. Setelah selesai proses hardfacing, kemudian dilakukan perlakuan panas serta pendinginan cepat dengan dua media yang berbeda yaitu oli dan minyak sayur. Hasil dari penelitian ini adalah berdasarkan foto struktur mikro, struktur yang terbentuk adalah perlite, ferrite dan martensite dan kekerasan yang dihasilkan untuk sampel tanpa perlakuan panas, sampel dengan pendinginan oli dan sampel dengan pendinginan minyak sayur masing-masing adalah 468,1, 490,4 dan 532,4 VHN. Kesimpulan dari penelitian ini adalah sampel dengan pendinginan minyak sayur memiliki kekerasan tertinggi karena lebih banyak martensite yang terbentuk. Sedangkan sampel tanpa perlakuan panas menghasilkan kekerasan terendah karena struktur yang terbentuk ferrite dan pearlite.
Co-Authors Anggrainy, Rani Ansori, Fuad Bambang Soegijono Basori Basori Cahaya Rosyidan Dwi Nanto, Dwi Ferry Budhi Susetyo Hari Krisyono , Danar Hasbi, Muhammad Yunan Ibnu Mubarak Indriasti, Zulfah Kurniawan, Ova Maman Kartaman Ajiriyanto Muhamad Yusup , Fahmi Sopiyan Sopiyan, Sopiyan Sugeng Priyanto, Sugeng Sutia, Iyep Syamsuir Syamsuir, Syamsuir Syaripuddin Syaripuddin Syaripuddin Tresdiawan, Rendi Ardi Yudanto, Sigit Dwi