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KAJI EKSPERIMEN PERBAIKAN CACAT RONGGA BENDA CORAN MATERIAL FC 250 MELALUI PROSES PENGELASAN BERBASIS ELEKTRODA NIKEL Hidayat, Reza Yadi; Soetopo, Antonius Adi; Muslim, Dede Buchori; Nahrowi, Muhammad; Khairani, Syifa
Machine : Jurnal Teknik Mesin Vol 10 No 2 (2024): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v10i2.5492

Based on the case study in the field, it was found that the casting product had surface defects in the form of cavities and was then repaired using a nickel electrode-based welding method. This repair was carried out to close the cavity defects so that a perfect casting shape was obtained. The material that has been welded has a different hardness from the base material, making it difficult to machining. This study aims to analyze the effect of welding on the ability of gray cast iron material that has been welded in terms of cutting tool wear and chip formation. The sample used was made of gray cast iron with a weld bead on its surface. Welding used a CIN-1 nickel electrode with the SMAW (shielded metal arc welding) welding method. Cutting was carried out using a conventional milling process using an HSS dovetail cutter. Observations were made through hardness testing on the base material, PMZ (partially melted zone), and weld metal which was continued with microstructure testing, wear measurement and chips formed. Based on the results of observations of FC 250 material that was welded on the base material, the microstructure formed was pearlite with graphite in the form of thin and long flakes. The microstructure in PMZ is formed by martensite and carbide, while the microstructure in weld metal consists of an austenite matrix with even distribution of graphite particles. The microstructure formed affects the hardness value of the material. From the observation, the hardness between weld metal and base material is not much different, namely 219 HV and 224 HV. The hardness in PMZ is 385 HV.

Creation of Interactive Learning Media Introduction to Basic Phrase Practicum Based on Virtual Reality Technology Soetopo, Antonius Adi; Muldani H, Yogi; Muslim, Dede Buchori; Suseno, Suseno
International Journal of Social Discussion Vol. 1 No. 2 (2024): Journals International Journal of Social Discussion
Publisher : Raudhah Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59613/2xg3my90

Interactive Learning Media in the learning process can be in the form of a relationship between humans and computers or software that allows active learning by not only seeing and hearing but also being able to do something. At the beginning of 2020, the world was shocked by the Covid-19 virus which caused people from various fields to work at home or online (online), including in the field of education. The practicum learning process at the Bandung Manufacturing Polytechnic was constrained during the pandemic because it was not fully carried out offline. One of them is the manufacturing process practicum, so an online learning media was created regarding the clamping of workpieces and cutting tools in the basic milling manufacturing process practicum based on virtual reality technology. This virtual reality-based learning media is made with Unity 3D software. The interactive learning media that has been created is installed on the Oculus Quest 2 device. The learning media includes an introduction to milling machines, clamping workpieces and cutting tools. The results of the virtual reality technology-based learning media testing questionnaire to students showed that the average respondent strongly agreed with 58% for the six aspects of assessment and overall effectiveness with a result of 88.34%.

KAJI EKSPERIMEN PERBAIKAN CACAT RONGGA BENDA CORAN MATERIAL FC 250 MELALUI PROSES PENGELASAN BERBASIS ELEKTRODA NIKEL Hidayat, Reza Yadi; Soetopo, Antonius Adi; Muslim, Dede Buchori; Nahrowi, Muhammad; Khairani, Syifa
Machine : Jurnal Teknik Mesin Vol 10 No 2 (2024): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v10i2.5492

Based on the case study in the field, it was found that the casting product had surface defects in the form of cavities and was then repaired using a nickel electrode-based welding method. This repair was carried out to close the cavity defects so that a perfect casting shape was obtained. The material that has been welded has a different hardness from the base material, making it difficult to machining. This study aims to analyze the effect of welding on the ability of gray cast iron material that has been welded in terms of cutting tool wear and chip formation. The sample used was made of gray cast iron with a weld bead on its surface. Welding used a CIN-1 nickel electrode with the SMAW (shielded metal arc welding) welding method. Cutting was carried out using a conventional milling process using an HSS dovetail cutter. Observations were made through hardness testing on the base material, PMZ (partially melted zone), and weld metal which was continued with microstructure testing, wear measurement and chips formed. Based on the results of observations of FC 250 material that was welded on the base material, the microstructure formed was pearlite with graphite in the form of thin and long flakes. The microstructure in PMZ is formed by martensite and carbide, while the microstructure in weld metal consists of an austenite matrix with even distribution of graphite particles. The microstructure formed affects the hardness value of the material. From the observation, the hardness between weld metal and base material is not much different, namely 219 HV and 224 HV. The hardness in PMZ is 385 HV.

Effect of Temperature and Holding Time Variations in the Annealing Process of Ni-Hard Material on Machinability Soetopo, Antonius Adi; Hidayat, Reza Yadi; Billy Heriawan; Muslim, Dede Buchori; Mudji, Paulus
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12739

Ni-Hard cast iron was selected for the pump cover material because of its exceptional abrasion resistance afforded by a Ni–Cr-alloyed, martensitic matrix with hard carbides. This alloy (e.g. ASTM A532 Ni-Hard 4) typically has hardness in the 50–58 HRC range. However, this extreme hardness makes conventional machining difficult, often causing rapid tool wear and poor surface finish. In contrast, conventional cast irons like FC25 machine easily but fail prematurely under abrasive service. Thus, to balance wear resistance and machinability, we heat-treated Ni-Hard. Annealing experiments (400–600 °C and 800–1000 °C) were carried out, followed by hardness testing and machining trials. We find that high-temperature annealing (1000 °C, 4–6 h) effectively softens the Ni-Hard (to ~39–32 HRC), enabling conventional milling with minimal tool failure. Lower-temperature anneals produced little softening and even carbide precipitation. These results agree with literature on high-Cr iron annealing. The softened microstructure (spheroidized carbides, ferrite/austenite matrix) and substantially improved machinability validate Ni-Hard’s suitability after annealing for abrasive slurry pump components.

RANCANG BANGUN MESIN PENCACAH SABUT KELAPA UNTUK MEDIA TANAM DAN BAHAN PUPUK ORGANIK CAIR BENIH KENTANG DI DESA PANGALENGAN Nugraha, Dhion Khairul; Setiawan, Haris; Pandoe, Pandoe; Muhadi, Novi Saksono Brodjo; Muslim, Dede Buchori; Rahayu, Okta Pianti; Harja, Herman Budi; Nurrahman, Ivan
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 8, No 3 (2025): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v8i3.61798

Kentang merupakan komoditas unggulan di Desa Pangalengan, Kecamatan Pangalengan. Untuk mengasilkan produksi kentang yang berkualitas, dimulai dengan mendapatkan benih kentang dengan kualitas yang baik. Pada proses pembenihan, media tanam dan penggunaan pupuk organik cair menjadi salah satu parameter yang penting. Bahan dari media tanam dan pupuk organik cair salah satunya adalah cocopeat dan cocofiber yang diperoleh dari sabut kelapa. Saat ini petani kentang memperoleh cocopeat dan cocofiber dengan cara manual yaitu dipukul dan dicacah menggunakan parang sehingga membutuhkan waktu yang lama. Kegiatan pengabdian masyarakat ini adalah rancang bangun mesin pencacah sabut kelapa yang mempu mencacah dan memisahkan hasil cacahan cocopeat dan cocofiber. Kegiatan ini juga merupakan implementasi teknologi tepat guna. Metode kegiatan ini dimulai dengan mengidentifikasi target hasil cacahan, melakukan perancangan mesin, membuat mesin pencacah, melakukan uji coba, dan sosialisasi penggunaan. Hasil uji coba menunjukkan mesin pencacah mampu mencacah dan memisahkan cocopeat dan cocofiber. Parameter kecepatan putar optimal dari mesin yaitu 1300 rpm. Kapasitas mesin pencacah adalah 7 kg/jam mengacu pada cocopeat dan cocofiber yang dihasilkan. Selain untuk mencacah sabut kelapa, mesin pencacah juga mampu digunakan untuk mencacah rumput. Implementasi teknologi ini berhasil mendukung petani kentang dalam mempersiapkan proses menghasilkan benih kentang yang berkualitas.

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