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All Journal Rekayasa Mesin Rekayasa Sipil Turbo : Jurnal Program Studi Teknik Mesin Indonesian Physical Review DIKEMAS (Jurnal Pengabdian Kepada Masyarakat) Specta Journal of Technology PIKAT
Jatmoko Awali
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Environmental Science Mechanical Engineering Physics Social Sciences Other

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CHARACTERIZATION AND ELECTROCHEMICAL BEHAVIOUR OF BORON DOPED DIAMOND IN DETECTING AMODIAQUINE Dewanto, Hizkia Alpha; Awali, Jatmoko; Hizam, Fadli; Destiny, Keysi Devain; Al Habib, Irsyad; Nabila, Najwa; Handayani, Murni; Triana, Yunita
Indonesian Physical Review Vol. 7 No. 3 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i3.345

Abstract

Amodiaquine (AQ) is an essential medicine in treating malaria. Yet, the threat of drug resistance and toxicity necessitates accurate measurement of AQ in the human body. This research determines the amodiaquine (AQ) detection performance of boron-doped diamond (BDD) working electrodes. The study utilizes different pulse velocity (DPV) methods to analyze the AQ reaction behavior of BDD. The research demonstrates the reaction mechanism: Two electrons are transferred, and irreversible oxidation reactions occur. The sensor limit of detection (LOD) is measured to determine the performance of working electrodes for AQ detection. The LOD is calculated between 0.0645 µM and 0.3 µM, and changes in analytical concentrations relative to maximum current are calculated. The LOD of the BDD electrode is 1.5×10–8 M, lower than previous research on AQ sensors, showing the effectivity of the BDD electrode as an AQ sensor.
ANALISIS PENGARUH VARIASI ARAH PENGELASAN HARDFACING TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO PADA BAJA ASTM A36 Awali, Jatmoko; Maulana, M. Arzil; Rohimsyah, Fikan Mubarok; Triana, Yunita
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1507

Abstract

Welding is a metal joining process with filler or without filler. The welding method is also used to thicken the surface of the material or hardfacing. Hardfacing is a welding process with the aim of improving mechanical properties and is used on worn components by using SMAW welding, SMAW welding is used because it is relatively inexpensive and flexible. The purpose of this study was to determine the effect of hardfacing with SMAW welding direction variations on the tensile strength and microstructure of ASTM A36 steel material. The welding directions are horizontal, vertical and diagonal. This study used ASTM A 36 steel with a thickness of 5 mm. The welding electrode was E7018 with a diameter of 3.2 mm and a current of 130 A. After conducting this research, the highest average tensile strength value was found in the vertical direction, which was 474.74 N/mm2. The average value of the tensile strength in the diagonal direction is 446.715 N/mm2. The average horizontal tensile strength value is 420.785 N/mm2.
ANALISIS JARAK GRID HARDFACING TERHADAP NILAI KEKUATAN BENDING PADA MATERIAL ASTM A36: Hardfacing Awali, Jatmoko; Dewanto, Hizkia Alpha; Ismail , Andi Idhil
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1869

Abstract

Welding is the joining of metals in liquid form using heat energy in making products in the process of joining materials such as in the automotive sector. The development of welding has reached the additive manufacturing process, one of which is hardfacing, namely the thickening of a component that already exists in the industrial sector. In the automotive sector, many people use ASTM A36 or mild steel, namely carbon steel, for standard specifications for structural applications. Hardfacing is a process with an angle welding approach and the resulting structure has a direct relationship with the welding parameters and material characteristics during welding. Adding corner welding grids to increase the strength value of special mechanical properties such as car bodies. This research aims to determine the effect of the shape of the welding grid on the mechanical properties of GMAW welding using ER70S-6 electrodes and a welding current of 80 Ampere with variations in the weld metal spacing, namely 5 mm, 10 mm, 15 mm, and with ASTM A 36 material with a thickness of 2 mm. GMAW welding uses constant current by varying the hardfacing grid. From the research results it is known that the largest stiffness value is found at a variation of the weld metal distance of 10 mm with an average value of 1737.5 N. In the microstructure the phase formed is ferrite (F) and along the grain boundaries pearlite (P) is formed.
Analysis on the Improvement to the Mechanical Properties of ASTM A36 Using Spot Hardfacing Method Awali, Jatmoko; Rohimsyah, Fikan Mubarok; Ismail , Andi Idhil; Dewanto , Hizkia Alpha; Al-Shehan, Khulafaur Nawaf; Akram, Muhammad; Yusuf, Chiara; Triana, Yunita; Zulfikar, Ainun
Jurnal Rekayasa Mesin Vol. 17 No. 2 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Hardfacing is considered to be an optimum, lightweight method to improve the strength of electrical vehicle chassis to be used in many places with variable road conditions in Indonesia, especially around the New National Capital (IKN) area. In this study, carbon steel (ASTM A36) plates were strengthened by spot hardfacing using an ER70S-6 electrode. Variables used in this study are weld dwelling time (4, 7, and 10 seconds with a constant distance of 30 mm) and spot distance (20, 30, and 40 mm with a 7 second dwelling time). From this study, the increase of dwelling time and the decrease of the spot distance enhanced the toughness of the specimens. Further observations discovered that both dwelling time increase and spot distance decrease correlated to the increase of the average grain size of the phases present in the specimens. The optimum variations observed in this research are 10 seconds dwelling time of 1,321-1,508 J/mm2 and 20 mm of spot distance of 1,312-1,456 J/mm2.
Co-Authors Ahmad Syaifuddin Ainun Zulfikar Akbar, Rizky Al Habib, Irsyad Al-Shehan, Khulafaur Nawaf Asroni Basyaruddin Basyaruddin, Basyaruddin Darma, Daffa Irsyad Destiny, Keysi Devain Dewanto , Hizkia Alpha Dewanto, Hizkia Alpha Hizam, Fadli Idhil Ismail, Andi Indrawati, Dini Ismail, Ika Laksono, Andromeda Dwi Leoriza, Meutya Dwi LIA AMALIA Maulana, M. Arzil Moch. Agus Choiron Mohd, Yusairie Muhammad Akram Muhammad Rifani, Muhammad Murni Handayani Muthia Putri Darsini Lubis Nabila, Najwa Pratama, Winardi Dian Wahyu Putra, Ade Wahyu Yusariarta Rohimsyah, Fikan Mubarok Rudiyanto, Fahmi Sinambela, Maria Lena Stasiyanur, Flora Suryaningsih, Alnovia - Tajalla, Gusti Umindya Nur Tanjung, Rifqi Aulia Thesalonicha, Somalinggi Yanti, Lisda Yudy Surya Irawan Yunita Triana, Yunita Yusuf, Chiara