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Comparison of Corrosion Rate on Paint Coated and Uncoated SS400 Steel Hariyadi, Eko; Jufri, Mohammad; Hasanuddin, Hasanuddin
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 2, No 1 (2017)
Publisher : University of Muhammadiyah Malang

To prevent corrosion in metal, especially carbon steel, always need efforts which considered expensive one. But, compared with costs and losts when the corrosion attack is not properly managed then the cost of efforts is much lower. The most popular method in preventing corrosion attack is by coating of metal which also has decorative objective. In this research, four coating materials were applied to the surface of low carbon steel strips (SS400) and as control uncoated SS400 steel strips were also employed. The steel strips then were dipped into electrolite solution consisted of 30% of consentration of H2SO4, and NaCl soluted in river water for 15 (fifteen) days. After the presetted time was elapsed, the steel strips then examined for lost of mass. It was found that the highest lost of mass was for unpolished uncoated one dipped in H2SO4 with corrosion rate of 4,566.06 mpy. The lowest lost was for paint coated one dipped in NaCl-river water solution with corroion rate of 0.64 mpy.

The Effects of Transient Temperature around Welds on Mechanical Properties of A36 Steel Plate Jufri, Mohammad
Journal of Energy, Mechanical, Material and Manufacturing Engineering Vol 1, No 1 (2016)
Publisher : University of Muhammadiyah Malang

There are various ways for welding experts to improve their production quality, and one of which is by designing a particular type of welding tool. Besides aiming to replace the function of operatorâs body parts, the tool is also able to control buckling distortions, crack propagations, and stress voltage, as well as to save an additional work, which is the heat treatment after welding process. The best method to control buckling distortions from the thin plate is by applying pre-heating and thermal tensioning. Thermal tensioning is the characterization by heat application during welding process. Transient thermal tensioning is a supporting tool around the weld which is given periodical heat by following the movement of arc welding. The purpose of this research was to minimize distortions and maximize the performance (mechanical properties) of welding joints shaped due to the transient temperature application during the welding process. The method employed in this research was experiment by using A36 steel plate with transient temperature variation of 100, 200, and 300oC, with velocity of 8 mm/s and heater (toutch) distance of 4, 6, and 8 cm. In this research, the researcher conducted tensile-strength test according to the JIS G 3101 standard and hardness test around weld, HAZ (Heat Affected Zone), and parent metal.The findings showed that the change of transient temperature and heater distance affected the mechanical properties (hardness and tensile strength) of A36 steel. The highest level of hardness was obtained in the temperature of 200Â°C and heater distance of 6 cm, which was as much as 404 VHN. The highest level of tensile strength was obtained in the temperature of 200Â°C and heater distance variation of 8 cm with yield stress of 302 Mpa and maximum tensile strength of as much as 491 Mpa.

The Effects of Transient Temperature around Welds on Mechanical Properties of A36 Steel Plate Mohammad Jufri
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 1 No. 1 (2016)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v1i1.4479

There are various ways for welding experts to improve their production quality, and one of which is by designing a particular type of welding tool. Besides aiming to replace the function of operator’s body parts, the tool is also able to control buckling distortions, crack propagations, and stress voltage, as well as to save an additional work, which is the heat treatment after welding process. The best method to control buckling distortions from the thin plate is by applying pre-heating and thermal tensioning. Thermal tensioning is the characterization by heat application during welding process. Transient thermal tensioning is a supporting tool around the weld which is given periodical heat by following the movement of arc welding. The purpose of this research was to minimize distortions and maximize the performance (mechanical properties) of welding joints shaped due to the transient temperature application during the welding process. The method employed in this research was experiment by using A36 steel plate with transient temperature variation of 100, 200, and 300oC, with velocity of 8 mm/s and heater (toutch) distance of 4, 6, and 8 cm. In this research, the researcher conducted tensile-strength test according to the JIS G 3101 standard and hardness test around weld, HAZ (Heat Affected Zone), and parent metal.The findings showed that the change of transient temperature and heater distance affected the mechanical properties (hardness and tensile strength) of A36 steel. The highest level of hardness was obtained in the temperature of 200°C and heater distance of 6 cm, which was as much as 404 VHN. The highest level of tensile strength was obtained in the temperature of 200°C and heater distance variation of 8 cm with yield stress of 302 Mpa and maximum tensile strength of as much as 491 Mpa.

Comparison of Corrosion Rate on Paint Coated and Uncoated SS400 Steel Eko Hariyadi; Mohammad Jufri; Hasanuddin Hasanuddin
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 2 No. 1 (2017)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v2i1.4904

To prevent corrosion in metal, especially carbon steel, always need efforts which considered expensive one. But, compared with costs and losts when the corrosion attack is not properly managed then the cost of efforts is much lower. The most popular method in preventing corrosion attack is by coating of metal which also has decorative objective. In this research, four coating materials were applied to the surface of low carbon steel strips (SS400) and as control uncoated SS400 steel strips were also employed. The steel strips then were dipped into electrolite solution consisted of 30% of consentration of H2SO4, and NaCl soluted in river water for 15 (fifteen) days. After the presetted time was elapsed, the steel strips then examined for lost of mass. It was found that the highest lost of mass was for unpolished uncoated one dipped in H2SO4 with corrosion rate of 4,566.06 mpy. The lowest lost was for paint coated one dipped in NaCl-river water solution with corroion rate of 0.64 mpy.

Mechanical Properties of Layered-Carbon Fiber Reinforced with Vacuum Infusion Process Ali Saifullah; Mohammad Jufri; Dini Kurniawati; Risky Chandra
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 6 No. 1 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i1.16428

Research on material engineering is widely developed in the precursors, composition of the material, and technique to create a composite. The layering and vacuum infusion resin are the developing technology to create the composites with the new characteristics and properties. This experiment is intended to find out the characteristics of layering carbon fiber reinforced by resin and is molded with vacuum infusion technique. The specimens of this experiment is layered-carbon fiber composites determined in three, four, five, six, and seven layers. The precursors of 220 and 240 carbon fibers are the main material of the composites. The tests conducted to the specimens are bending and tensile tests. The both tests are treated to reveal the mechanical properties of the composites. The least layers of 220 and 240 carbon fiber result the highest value of bending test, but the most number of carbon fiber layers show the opposite value. The results are reverse in the tensile test. The highest value of the tensile test is achieved by the most layers of carbon fiber, while the lowest value is in the least layers. This result is almost the same with the strain-stress, but overall the graphic is similarly increase to the most layers. Deduction achieved in this experiment is that the number of layers in the carbon fiber composites is significantly influencing the mechanical properties of the composite.

The Effect of Electroplating Hard Chrome with Different Dissolvent Compositions to the Mechanical Properties of ST-37 Mohammad Jufri; Yeshar Ego Ginola; Rr. Heni Hendaryati; Ali Saifullah; Daryono
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 6 No. 3 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.20669

Electroplating hard chrome is a metal plating process with hard chrome which aims to not only coat as decorative, but also to coat metal surfaces more strongly, according to their use in the engineering world. In addition to decorative properties, the advantages of surface treatment techniques can also increase hardness, wear resistance, and corrosion resistance. The purpose of this research is generally to determine the effect of different solution compositions in the electroplating process of hard chrome on the impact strength of the structure on ST-37 steel. This time the specimens are 100mm x 6mm x 6mm and 50mm x 50mm as many as 3 pieces. In this study, the electroplating process of hard chrome was carried out using different parameters of the CrO3 solution composition from previous studies, namely 200 gr/lt, 350 gr/lt, and 400 gr/lt with an immersion time of 22 minutes. The results of this electroplating process were tested by testing the impact strength and microstructure. The results of the study can be concluded that the more the composition of the solution, the higher the impact toughness. The highest impact toughness value is 0.998 joules/mm2 at a solution concentration of 400 grams/litre and the surface results on ST-37 steel after getting hard chrome electroplating treatment is that the surface has Cr elements attached and gets thicker with increasing concentration which is used as a variation with the same immersion time.

The influence of drying temperature variation on the quality of bagasse bio-pellet Mohammad Jufri; Billy Muhammad; Mulyono; Daryono; Heni Hendaryati; Ali Saifullah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 1 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i1.29192

Demand for bio-pellet as alternative energy has widely increased. It occurs as people are aware of energy-saving for today and future living. Therefore, the increment in bio-pellet quality has also been a concern. The bio-pellet quality can be influenced by the materials (biomass) and its treatments. One of the treatments for the bagasse bio-pellet is drying. It is conducted to lessen its moisture before it is produced by the ring die pellet mill. The influence of drying temperature on bagasse bio-pellet quality is the focus of this experiment. The result shows that the different drying temperature for bagasse bio-pellet gives a different quality. However, those qualities comply with the requirement of the Indonesian National Standard for biomass energy.

Implementasi Kebijakan Insentif Pajak Pertambahan Nilai Sebagai Instrumen Pendukung Program Gerakan Nasional Bangga Buatan Indonesia Djufri, Mohammad
Jurnal Widyaiswara Indonesia Vol. 4 No. 04 (2023): Desember 2023
Publisher : Dewan Pimpinan Pusat Asosiasi Profesi Widyaiswara Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56259/jwi.v4i04.211

Pemerintah memberi dukungan kepada UMKM melalui beberapa kebijakan insentif PPN dan program Gerakan Nasional Bangga Buatan Indonesia (Gernas BBI). Dalam kajian ini dibahas bagaimana implementasi kebijakan insentif PPN ini dapat mendukung program pemerintah tersebut. Penelitian menggunakan metode kualitatif dan implementasi kebijakan insentif PPN dikaji dengan perpaduan Model George Edward III dan Model Van Meter dan Van Horn, yaitu meliputi dimensi komunikasi, struktur birokrasi, standar dan sasaran kebijakan serta lingkungan ekonomi, sosial dan politik. Hasil kajian keempat dimensi tersebut diperoleh gambaran kebijakan insentif yang dapat mendukung program Gernas BBI, yaitu faktor kejelasan peraturan, kesederhanaan prosedur dan kemudahan persyaratan. Ketiga faktor ini diperkuat oleh sosialisasi peraturan ke petugas pajak dan ke wajib pajak. Government supports MSME’s through VAT incentive policies and Gerakan Nasional Bangga Buatan Indonesia (Gernas BBI) Program. This study discusses how the implementation of VAT incentive policies can support the government's program. The research using qualitative methods and implementation of the VAT incentive policy was studied with the blend of the George Edward III Model and the Van Meter and Van Horn Model, which covers the communication dimensions, the bureaucratic structures, the standards and objectives and the economic, social and political conditions. The results of the four-dimensional study provide an overview of the incentive policies that can support the Gernas BBI program, namely the factors of regulatory clarity, procedural simplicity and ease of requirements. These three factors are reinforced by the socialization of regulations to tax officials and to taxpayers.

VALUE-ADDED AND INCOME ANALYSIS OF FISH CRACKERS BUSINESS (CASE STUDY: SOUTH SIBOLGA SUB-DISTRICT, SIBOLGA CITY) Lily Fauzia; Tiya Veronica; Mozart Bahauddin Darus; Mohammad Jufri
International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS) Vol. 5 No. 3 (2025): June
Publisher : CV. Radja Publika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/ijebas.v5i3.3244

This study aims to analyze the added value of fish cracker production and assess the feasibility of the business in South Sibolga Subdistrict, Sibolga City. The research location was selected purposively, involving two fish cracker producers as respondents, identified using a census method. The analysis utilized the Hayami value-added method and the Revenue-Cost (R/C) ratio to evaluate feasibility. Results show that the added value generated from fish cracker processing reached Rp 225,721.14 per kilogram, with a value-added ratio of 55.22%. The monthly income from the business amounted to Rp 5,573,076.35. The R/C ratio was 1.74, indicating that the fish cracker business is financially feasible. These findings highlight the potential of small-scale fish processing industries to enhance household income and promote local economic development.

PELATIHAN DASAR ROBOTIKA UNTUK SISWA SMAN 26 BATAM Candra, Joni Eka Candra; Jufri, Mohammad; Aranski, Alvendo Wahyu; Abrar, Mohammad Masril; Noviardi, Refli; Nasution, Nadia Widari; Burhan, Rifatul Mahmudah
JUPADAI : Jurnal Pengabdian Kepada Masyarakat Vol. 3 No. 1 (2024): Volume 3 Nomor 1 2024
Publisher : Asosiasi Dosen Akutansi Indonesia, KEPRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64795/jupadai.v3i1.123

Batam 26 High School or known as Smandanam is a superior school which aims to produce a generation with knowledge and superior character. whose address is at the Botania 1 Complex, Botania Garden Batam Center Batam City, where currently SMAN 26 Batam is led by Mr. Midiyanto, S.PD., M.M as Principal of the School. At SMAN 26 Batam, currently there are two main focus areas: the Department of Natural Sciences (IPA) and the Department of Social Sciences (IPS). Given the importance of digital technology and automation in both domestic and industrial settings, it is important to include robotics curricula from elementary to high school, even though they are currently offered as extracurricular activities. The most important aspect of the Community Service program is the potential for sustainability. This program can be continued with a mentoring program in the development of extracurricular curriculum at SMAN 26 Batam, namely by assisting in making different types of mobile robots. The method that will be used is the method of providing mobile robot materials and will briefly present the steps for assembling a mobile robot. Furthermore, participants will try out the assembled results in the field or object work line. On this occasion the PengMas team will help provide training on assembling mobile robots. This robotics training activity provides an opportunity for students and teachers to become more familiar with basic computer programming and furthermore, participants will have the skills to assemble robots.

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