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Kosjoko Kosjoko
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya
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Pengaruh Variasi Arus Las SMAW Terhadap Uji Tarik dan Uji Kekerasan Serta Struktur Mikro Pada Bahan ST 37 Surahman, Andika; Mufarida, Nely Ana; Kosjoko, Kosjoko
Journal of Engineering Science and Technology Vol. 1 No. 3 (2023): September
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i3.21

Abstract

This research aims to determine the effect of variations in welding currents of 90A, 100A, and 110A on SMAW bases on the material in the tensile, hardness, and microstructure tests. This research uses ST37 low carbon steel and uses E6013 electrodes with a diameter of 3.2 mm, followed by making specimens for testing. After that, the welding process is carried out and then testing continues. In the test, the following results were obtained: The strength value of the welded material with tensile testing was obtained with the highest results at a current variation of 110A with Yp 27.33 Mpa, Max 36.47 Mpa, Break 31.08 Mpa. Because the highest pearlite microstructure value is obtained in the 110A variation. And the lowest value occurred in the welded material of variation 90A with Yp 25.48 Mpa, Max 26.86 Mpa, Break 12.33 Mpa. Because the lowest pearlite microstructure value is obtained in the 90A variation. while the comparison of the level of hardness in ST 37 carbon steel with varying welding currents ranging from 90A, 100A, and 110A has an average hardness value of 168 VHN for welding with a current of 90A for welding with a current of 100A the average hardness value is 177 VHN and finally in welding current 110A the average hardness value is 191 VHN. The hardness level of the ST 37 carbon steel specimen was the highest at a welding current of 110A, with a tensile strength test result of 36.47 MPa. And from the results of observing photos of the microstructure using the point count method, the highest percentage of pearlite was in the welding material variation 110A so the tensile strength value was higher.
Pengaruh Variasi Arus Pada Pengelasan SMAW Terhadap Uji Kekuatan Bending dan Struktur Micro Baja ST 42 Mabrullah, Riki Alan; Kosjoko, Kosjoko; Shofiyah, Rohimatush
Journal of Engineering Science and Technology Vol. 2 No. 2 (2024): May
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v2i2.24

Abstract

This research aims to analyze the effect of variations in welding current on the mechanical strength of ST 42 steel using the SMAW welding method and E6013 electrodes with a diameter of 3.2 mm. The variations in welding current used are 90A, 100A and 110A. The tensile test results show that a welding current of 110A produces the highest tensile test value with a yield point (YP) of 8,368 MPa, maximum stress (MAX) of 9,890 MPa, and break point (BREAK) of 5,283 MPa. Bending tests indicate that a welding current of 110A produces the highest bending strength of 10.118 MPa. Microstructural observations revealed that the highest percentage of pearlite was present in welding with a current of 110A, which contributed to an increase in the tensile strength of the material. From the results of this research, it can be concluded that the increase in welding current is directly proportional to the increase in the mechanical strength of ST 42 steel
Effect of Pyrolysis Temperature Variation on Optimization of Tobacco Stalk Biochar Characteristics Kosjoko, Kosjoko; Abidin, Asroful; Hadi, Danang Kumara; Rizkina, Fitriana Dina
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2193

Abstract

Tobacco stalk waste is an agricultural residue with high potential for development as a renewable energy source through a thermochemical conversion process. This study aims to evaluate the effect of varying pyrolysis temperature on the physical and chemical characteristics of biochar produced from tobacco stalk, in order to determine the optimum temperature for producing the best quality product. The method used was a closed pyrolysis process in a stainless-steel reactor at three temperature variations: 290, 390, and 490°C for 60 minutes. The pyrolyzed biochar was analyzed using proximate analysis, calorific value testing, and chemical functional group characterization using Fourier transform infrared spectroscopy. The results showed that higher pyrolysis temperatures consistently decreased moisture and volatile matter content, while increasing the bound carbon content and calorific value of the biochar. At 490°C, the best biochar characteristics were obtained with a bound carbon content of 56.25%, a moisture content of 4.5%, volatile matter of 24.3%, and the highest calorific value reaching 5521.90 cal/g. Chemical structure analysis also indicated the formation of more stable functional groups at higher temperatures, indicating a more advanced level of carbonization. These findings indicate that within the investigated temperature range (290–490°C), 490°C yielded the biochar with the most favorable characteristics for solid fuel applications, specifically regarding fixed carbon content and calorific value. While 490°C represents the peak performance in this study, it serves as a critical operational point for achieving advanced carbonization in tobacco stalk waste. This research provides an important contribution to the development of efficient tropical biomass processing technologies. It expands the database of thermal and chemical characteristics of agricultural waste-based biochar, which has been understudied to date.
Pengaruh Variasi Jenis Pelarut Dan Jenis Cat Sebagai Inhibitor Korosi Terhadap Laju Korosi Baja Astm A36 Dewi Amalia; Kosjoko, Kosjoko; Nely Ana Mufarida
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 1 (2026): Maret
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i1.6521

Abstract

This study aims to analyze the effect of solvent variations in paint mixtures on the corrosion rate of ASTM A36 steel in a seawater immersion environment. ASTM A36 steel is widely used in construction and marine structures but is susceptible to corrosion due to exposure to seawater containing high concentrations of chloride ions. One commonly applied method for corrosion control is surface coating using paint as a physical inhibitor, whose effectiveness is strongly influenced by the type of solvent used. The solvent variations investigated in this study include thinner A special, thinner A ordinary, and thinner B. The research employed a quantitative experimental method. ASTM A36 steel specimens were coated with paint using a 50:50 ratio of paint to solvent and then immersed in natural seawater for 30 days. The corrosion rate was determined using the weight loss method. In addition, surface morphology observations after immersion were conducted using an optical microscope to identify the type and severity of corrosion damage. The results indicate that variations in solvent type within the paint mixture affect the corrosion rate of ASTM A36 steel. Certain combinations of paint and solvent were able to reduce the corrosion rate more effectively than others. These differences are attributed to the solvent’s ability to form a protective coating with good adhesion and uniformity on the steel surface. Therefore, selecting an appropriate solvent type can enhance the effectiveness of paint coatings as a corrosion control method for ASTM A36 steel in marine environments.
Co-Authors Abadi Sanosra Abdul Rohman Agus Surya S, M Amelia novinda sari Amri Gunasti Ana Mufarida, Nely Andre, Irham Andrean Asroful Abidin Bagus Dwi Kurniawan, Bagus Dwi Dewi Amalia Din’go Ega Prayitno, Rachmad Djoko Sutikno Fajar Santosa, Muhammad Felani, Fran Nur Fidhausi Alviyndin , Arta Abtian Finali, Asmar Fitriana Dina Rizkina Gilang, Aditya Gunawan, Arik Hairul Bahri, Mokh. Hawaij, Dedi Maulana Hifni, Mada Naufal Irawan, Moh Iskandar Umarie Mabrullah, Riki Alan Mufarida, Nely Ana Muhammad Zainur Ridlo Muliyaddi, Muliyaddi Nely Ana , Mufarida Nurhalim Nurhalim, Nurhalim Nurlina, Ika Tyas Octa, Hakim Pratama, Mokhammad Yoga Purnawan, Gilang Putra, Dhian Wahana Romadhon, Muhammad Firly Shofiyah, Rohimatush Sonief, Achmad As'ad Surahman, Andika Toha, Kamil Totok Dwi Kuryanto Ulumudin, M Ikhya