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EFFECT OF PREHEATING TEMPERATURE VARIATION ON MICROSTRUCTURE AND HARDNESS OF WELD OVERLAY CLADDING OF SS400 CARBON STEEL BY SMAW METHOD paundra, fajar; Rajagukguk, Kardo; Aldyansyah, Dimas; Pujiyulianto, Eko; Muhyi, Abdul
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/eyamkr90

Abstract

SS400 carbon steel is a type of low carbon steel that has low surface hardness, wears easily, and is not resistant to impact. The application of cladding can reduce the risk of material failure due to the weakness of SS400 carbon steel. In this study, cladding was performed by SMAW method using HV-600 electrodes and a current of 115 A. This welding process causes heat to be concentrated in the melting area, resulting in uneven heating and cooling, so preheating is necessary. This study aims to evaluate the effect of preheating temperature variations of 200°C, 300°C, 400°C, and non-preheating on microstructure and hardness in the cladding process. Macro structural testing shows that the application of preheating can minimize the occurrence of welding defects, and an increase in preheating has an effect on increasing the depth of the HAZ in each specimen tested.  Microstructure testing shows that the application of higher preheating will form more ductile phases in the base metal, diffusion layer, HAZ areas. The base metal area has pearlite and ferrite phases. The diffusion layer shows clear boundaries as a result of the diffusion process. The HAZ section forms a fine pearlite microstructure and coarse pearlite and ferrite phases. The weld metal layer is not affected by the preheating temperature used, there are martensite and ferrite phases. Hardness testing on 200oC preheating specimens has the highest hardness in the weld metal of 680.11 HV. Hardness in the diffusion layer, HAZ, and base metal which shows that an increase in preheating temperature affects the decrease in the hardness value of the specimen.
EFFECT OF VARIATION IMMERSION TIME  FIBER HEMP COMPOSITE USING NaOH MATRIX POLYURETHANE ON TENSILE STRENGTH METHOD paundra, fajar; Wibawa, Gilang Putra; Pujiyulianto, Eko; Syaukani, Muhammad; muhyi, Abdul; Nurullah, Fajar Perdana; Syanur, Farid Nanda
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/4sj3jr07

Abstract

NaOH immersion treatment on hemp fiber is very important in making composites. This is because natural fibers still contain materials such as lignin and hemicellulose so hemp fibers are cleaner and can provide strong fiber and resin attachment. The aim of this research is to find out how the best time for soaking in NaOH for hemp fiber compares to the tensile strength of hemp fiber composites. The materials used are polyurethane and hemp fiber. The research focused on variations without treatment, 2 hours, 3 hours, 4 hours, and 5 hours with a percentage of 5% NaOH and dried under direct sunlight after soaking. Composite manufacture was carried out using the compression molding method for 24 hours with a pressure of 5 bar. Tensile testing was also used in this research with reference to the ASTM D 638 standard. The fiber surface experiences changes in shape such as cleanliness, color and fiber structure which are different in each variation. It should be noted that the maximum tensile strength is 11,597 MPa at 4 hours of immersion, and the lowest tensile strength is 6,054 MPa at 5 hours of immersion. Then the lowest modulus of elasticity value is found in the variation without treatment at 0,049 GPa. The highest value of elastic modulus is found in the 4 hour variation with a value of 0,076 GPa.
Analisa Pengaruh Variasi Media Pendingin Pada Perlakuan Panas Terhadap Struktur Mikro Dan Nilai Kekerasan Fully Pearlitic Steel Muhyi, Abdul; Ramadhanty, Nabila; Pujiyulianto, Eko; Rajagukguk, Kardo; Paundra, Fajar
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2567

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh variasi media pendingin pada perlakuan panas terhadap nilai kekerasan dan struktur mikro fully pearlitic stell. Proses penelitian dilakukan dengan pemotongan fully pearlitic stell dengan ukuran 10 x 10 x 10 mm, kemudian dilakukan proses perlakuan panas dengan temperatur 900℃, selanjutnya dilakukan proses pendinginan dengan berbeda media pendingin seperti: udara, di dalam oven, air, oli bekas, dan salah satu spesimen yang tidak dilakukan perlakuan apapun sebagai pembanding. Hasil pengujian struktur mikro rel tanpa perlakuan mengandung struktur perlit dan ferit, dengan nilai kekerasan yang didapat 392,64 HVN. Media pendingin udara memiliki fasa ferit dan perlit, dengan nilai kekerasan 335,92 HVN. Pendinginan di dalam oven struktur mikronya adalah sementit, perlit, austenit dengan nilai kekerasan yang diperoleh 287,67 HVN, merupakan nilai kekerasan terendah. Untuk media pendingin air struktur mikro yang terbentuk ferit, austenit, martensit, nilai kekerasannya 915,89 HVN. Untuk pendinginan oli bekas struktur mikronya martensit, austenit, ferit dengan nilai kekerasan 916,38 HVN, media pendingin oli bekas mendapatkan nilai kekekarasan tertinggi.Kata kunci: Perlakuan panas, baja karbon tinggi, kekerasan, struktur mikro.
PEMBEKALAN DAN SOSIALISASI PENTINGNYA PENDIDIKAN TINGGI BAGI SISWA SMK NEGERI GADINGREJO PRINGSEWU Paundra, Fajar; Alfian, Devia Gahana Cindi; Muhyi, Abdul; Yudistira, Hadi Teguh
Perwira Journal of Community Development Vol 4 No 2 (2024)
Publisher : Unperba Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54199/pjcd.v4i2.311

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Program Studi Teknik Mesin ITERA mengembangkan disiplin berbasis cabang ilmu teknik mesin yang didefinisikan sebagai ilmu teknik yang mempelajari perancangan, produksi/pembuatan dan operasi mesin. Kunjungan siswa-siswi SMKN 1 Gadingerjo ke kampus merupakan salah satu upaya yang penting dalam memperkenalkan dan mempersiapkan mereka untuk pengalaman pendidikan tinggi. Dalam beberapa kasus, kunjungan siswa ke kampus juga dapat menjadi bagian dari program orientasi atau rekrutmen mahasiswa baru. Hal ini memungkinkan siswa untuk memperoleh pemahaman yang lebih baik tentang persyaratan pendaftaran, proses seleksi, dan tata cara mengajukan aplikasi. Kunjungan dimulai dari Penerimaan Siswa Siswi SMKN1 Gadingrejo di Gedung Kuliah umum yang dilanjutkan dengan sesi diskusi. Selanjutnya kunjungan Laboratorium teknik mesin sebagai sarana pembelajaran kepada para siswa. Dengan demikian, kesimpulan dari sosialisasi program studi Teknik Mesin kepada SMKN1 Gadingrejo adalah bahwa kegiatan ini memiliki dampak positif dalam memberikan informasi, kesempatan, dan motivasi bagi siswa untuk mempertimbangkan dan memilih pendidikan tinggi di bidang teknik mesin sebagai langkah awal menuju karir yang sukses dan memuaskan.
Analisis Pengaruh Kecepatan Pemotongan dan Kuat Arus Terhadap Kekasaran Permukaan dan Lebar Kerf Pada Pemotongan Aluminium 5052 Menggunakan CNC Plasma Arc Cutting Manalu, Andrean Prima Jaya; Muhyi, Abdul; Puandra, Fajar; Siahaan, Yusuf Kornelius; Yusman, Fardhan Gurun Sangra
JUSTIMES (Jurnal Rekayasa Teknik Mesin Saburai) Vol 1, No 02 (2023): JUSTIMES (Jurnal Rekayasa Teknik Mesin Saburai)
Publisher : Universitas Sang Bumi Ruwa Jurai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24967/justimes.v1i02.2604

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Di era perkembangan dunia industri saat ini teknologi yang digunakan semakin canggih dan kompleks. Pemotongan merupakan suatu proses pengolahan bahan baku di dunia industri. Salah satu proses pemesinan non-konvensional adalah plasma arc cutting yang dimanfaatkan untuk mempermudah dalam pemotongan logam dengan menggunakan gas terionisasi. Penelitian ini bertujuan untuk mengetahui pengaruh variasi kecepatan pemotongan dan kuat arus terhadap kekasaran permukaan dan mengetahaui pengaruh variasi kecepatan pemotongan dan kuat arus terhadap lebar kerf dengan alat potong yang digunakan berupa mesin plasma arc cutting 20-45 Multipro cut 45 G-SB, dengan material yang digunakan plat aluminium 5052 dengan ketebalan 3mm. dalam proses pemotongannya, digunakan variasi kuat arus sebesar 25 A, 35 A dan 45 A dan variasi kecepatan pemotongan sebesar 800 mm/menit, 1000 mm/menit dan 1200 mm/menit. Pada hasil penelitian ini diperoleh nilai lebar kerf paling kecil pada penggunaan kecepatan pemotongan 1200 mm/menit dan variasi kuat arus 25 A. Nilai lebar kerf paling besar pada pengguanaan kecepatan pemotongan 800 mm/menit dan variasi kuat arus 45 A. Pada penelitian ini didapat nilai kekasaran permukaan paling kecil pada penggunaan kecepatan pemotongan 1200 mm/menit dengan kuat arus 45 A sebesar 21,60 μm dan nilai kekasaran permukaan paling tinggi didapat dari penggunaan kecepatan pemotongan 800 mm/menit dengan kuat arus 25 A sebesar 37,83 μm. Sehingga, dalam hal ini variasi kecepatan pemotongan dan kuat arus dapat mempengaruhi nilai lebar kerf dan nilai kekasaran permukaan hasil pemotongan.
Rancang Bangun Mesin Potong Jenis Scroll Saw Yusman, Fardhan Gurun Sangra; Muhyi, Abdul; Puandra, Fajar; Siahaan, Yusuf Kornelius; Manalu, Andrean Prima Jaya
JUSTIMES (Jurnal Rekayasa Teknik Mesin Saburai) Vol 1, No 02 (2023): JUSTIMES (Jurnal Rekayasa Teknik Mesin Saburai)
Publisher : Universitas Sang Bumi Ruwa Jurai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24967/justimes.v1i02.2605

Abstract

Scroll saw adalah salah satu alat atau mesin yang sering digunakan dalam dunia industri khususnya mebel. Scroll saw memanfaatkan tenaga listrik dan motor penggerak yang memiliki kecepatan konstan dan tetap. Pembuatan alat ini bertujuan untuk mengoptimalkan penggunaan scroll saw untuk pemotongan pada media besi khususnya pelat. Alat ini menggunakan motor listrik dari gerinda tangan sebagai penggerak dari mata gergaji. Mata gergaji bergerak naik turun lalu media yang ingin dipotong didorong ke arah mata gergaji. Alat ini dinyatakan berhasil karena sesuai dengan parameter yaitu pemotongan pada pelat besi dengan ketebalan 0,8 mm, 1,2 mm dan 3 mm yang terbatas pada kecepatan putaran 2250 RPM. Perancangan pada desain alat menggunakan aplikasi solid work 2022. Berdasarkan hasil perancangan, didapat bahwa mesin potong jenis scroll saw dapat memotong pelat besi dari ketebalan 0.8 mm, 1.2 mm dan 3 mm dengan RPM tertentu, dan dapat memotong plywood dengan ketebalan 1 cm.
Improving Learning Outcomes Using Case Based Learning (CBL) Assisted by Interactive Videos on Optical Materials Windrawan, I Gede; Muhyi, Abdul; Astra, I Made
Jurnal Penelitian Pembelajaran Fisika Vol 15, No 3 (2024): JULY 2024
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jp2f.v15i3.20472

Abstract

This study examines the effectiveness of applying the Case Based Learning (CBL)Model assisted by interactive videos in improving students' cognitive learning outcomes onoptical materials. The method used is Classroom Action Research with the subject of grade XIMIPA 5 students at SMA Negeri 6 Tangerang Regency for the 2023/2024 school year. Thisresearch was carried out in three cycles, including planning, implementation, observation, andreflection. The results showed that implementing interactive video-assisted CBL significantlyimproved students' cognitive learning outcomes. The average cognitive score of studentsincreased from 55.6 in the first cycle, to 70.4 in the second cycle, and reached 75.2 in the thirdcycle. In addition, the success rate of classical learning also increased from 28.7% in the firstcycle to 79.7% in the third cycle. This improvement shows that interactive video-assisted CBLis effective in actively engaging students in learning, improving conceptual comprehension, andmotivating students to learn physics. This study suggests the application of interactive video-assisted CBL as an alternative learning method that can improve the quality of physics educationin schools.
Improving Student’s Creative Thinking Skills using the Case Based Learning (CBL) Model assisted by Virtual Laboratory Media on Optical Materials Muhyi, Abdul; Windrawan, I Gede; Astra, I Made
Jurnal Penelitian Pembelajaran Fisika Vol 15, No 3 (2024): JULY 2024
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jp2f.v15i3.20470

Abstract

Abstract. The research aimed to assess the improvement of students' creative thinking skills through the implementation of the Case Based Learning (CBL) model, supported by a Virtual Laboratory, in the topic of Optics. The method used was Classroom Action Research (CAR) involving 41 students from class XI MIPA 6 at SMA Negeri 6, Kabupaten Tangerang. The research was designed in three cycles, each consisting of four stages: planning, action, observation, and reflection. The results indicated that the application of the CBL model, assisted by the Virtual Laboratory, significantly enhanced students' creative thinking abilities. The average percentage of students categorized as "Highly Creative" increased from 12.1% in the first cycle, to 29.2% in the second cycle, and reached 58.04% in the third cycle. Meanwhile, the percentage of students in the "Not Creative" category decreased from 24.3% in the first cycle, to 9.7% in the second cycle, and dropped to 0% in the third cycle. These findings suggest that integrating the CBL model with a virtual laboratory is not only effective in boosting creative thinking skills but also in deepening students' understanding of physics concepts visually. The implications of this research indicate that the use of Virtual Laboratory within the CBL model provides a strong framework for innovative teaching practices in physics education, which can enhance the effectiveness of learning and student motivation.
Pelatihan Pengolahan Blondo Menjadi Cookies untuk Penanganan Stunting di CV. Buah Asa Tani, Bangunrejo, Lampung Nareswari, Tantri Liris; Aziz, Syaikhul; Septiani, Winda; Muhyi, Abdul
Jurnal Kreativitas Pengabdian Kepada Masyarakat (PKM) Vol 7, No 5 (2024): Volume 7 No 5 2024
Publisher : Universitas Malahayati Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jkpm.v7i5.14169

Abstract

ABSTRAK Indonesia termasuk dalam jajaran negara penghasil kelapa terbesar di dunia. Untuk memastikan bahwa produk kelapa diserap oleh petani, usaha pengolahan kelapa, seperti UMKM yang menjual kelapa atau produk kelapa, adalah sektor yang krusial. Hasil samping pembuatan Virgin Coconut Oil, yaitu blondo, belum dimanfaatkan dan menimbulkan bau menyengat ketika dibuang langsung ke lingkungan. Padahal, blondo ini diketahui memiliki kandungan protein tinggi, yang dapat digunakan untuk pencegahan stunting. Tujuan dari kegiatan pengabdian masyarakat ini berfokus pada pelatihan dan pembuatan produk berbahan hasil samping olahan VCO pada CV. Buah Asa Tani (BAT). Pelatihan dilakukan dengan metode sosialisasi, diskusi dan tanya jawab serta praktik pembuatan cookies blondo untuk karyawan CV. BAT. Sebelum dan setelah pelatihan, terhadap peserta pelatihan dilakukan evaluasi secara terstruktur menggunakan kuesioner. Pelatihan manfaat kesehatan kelapa dan stunting, cara pembuatan cookies blondo untuk karyawan CV. Buah Asa Tani telah diselenggarakan dengan seluruh peserta (100%) menunjukkan peningkatan pengetahuan dan keterampilan. Hal ini menunjukkan potensi positif dalam mengatasi masalah limbah industri kelapa sambil meningkatkan keterampilan masyarakat setempat. Kata Kunci: Blondo, VCO, Pengabdian Masyarakat, Stunting, Kue Kering  ABSTRACT One of the world's leading producers of coconuts is Indonesia. Coconut processing companies, such as UMKM that sell coconuts or coconut goods, are an essential industry to guarantee that farmers receive their share of the product. The by-product of making Virgin Coconut Oil, namely blondo, has not been utilized and causes a strong odor when thrown directly into the environment. Blondo is known to have a high protein content, which can be used for stunting prevention. The purpose of this community service activity focuses on training and making products made from by-products of VCO processing in CV. Buah Asa Tani (BAT). The training was delivered to CV BAT employees through socialization, discussion, and question-and-answer sessions, along with the practical application of baking blondo cookies. Before and after the training, the training participants were evaluated in a structured manner using a questionnaire. The community service activities carried out through training and making blondo cookies products have increased the trainees' knowledge and ability to process blondo. This shows a positive potential in addressing the coconut industry waste problem while improving the skills of the local community. Keywords: Blondo, VCO, Community Services, Stunting, Cookies
ANALYSIS OF THE EFFECT OF VOLUME FRACTION VARIATION ON TENSILE AND BENDING STRENGTH OF COMPOSITE FIBER COMBINATION OF PINEAPPLE LEAVES AND FIBERGLASS WITH POLYESTER RESIN MATRIX BY COMPRESSION MOLDING METHOD Paundra, Fajar; Simatupang, Valentino Hasael; Muhyi, Abdul; Sidik, M. Farhan; Maulana, Sena
DINAMIKA : Jurnal Teknik Mesin Vol 9, No 1 (2024): Dinamika : Jurnal Teknik Mesin
Publisher : Program Studi Teknik Mesin Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/dinamik.v9i1.7920

Abstract

Pineapple leaf fiber is a waste that is widely found on the island of Sumatra and its potential utilization has not been maximized. Pineapple leaf fiber has potential as a constituent of natural fiber composites. This study aims to determine the effect of volume fraction variation on tensile and bending strength reinforced with pineapple leaf fiber and fiberglass. The composite manufacturing process uses the compression molding method for 24 hours with a pressure of 50 bar and is given a variation of 70% polyester resin, 25% fiberglass, 20%, 15%, 10%, 5%, and 25%, 20%, 15%, 10%, 5% pineapple leaf fiber. After completion of the composite manufacture, density and porosity testing was carried out with ASTM C271 standards, tensile testing was carried out using D3930 standards and bending testing using D790 standards. The lowest density test results and the highest porosity in composites with 70% resin variation, 25% fiberglass, 5% pineapple leaf fiber with a value of 0.87 gr/cm3 - 7.80% and the highest density value and the lowest porosity with 70% resin variation, 5% fiberglass, 25% pineapple leaf fiber with a value of 1.81 gr/cm3 - 1.53%. The highest tensile strength test results in the variation of 5% fiberglass volume fraction 25% pineapple leaf fiber of 237.76 MPa, and the lowest value in the variation of 25% fiberglass volume fraction 5% pineapple leaf fiber of 98.37 MPa. And the highest bending test was obtained in the variation of the volume fraction of 5% fiberglass 25% pineapple leaf fiber at 332.14 MPa, and the lowest value was obtained in the variation of 25% fiberglass 5% pineapple leaf fiber at 194.95 MPa.
Co-Authors Aditia Prahmana, Rico Agustin, Enur Haeni Alawiyah, Alawiyah Aldyansyah, Dimas Alfian, Devia G. C Ali, Fathudin Ammar, Naufal Anisa, Hida Arliani Nur Apriyadi, Anton Arief Budiman, Septian Arirohman, Ilham Dwi Ariyanto, Dika Ariyanto Budiharto, Arief Budiman, Septian Arief D, Febri Budi Daffa, Muhammad Darsono, Febri Budi Devia Gahana Cindi Alfian Dicky J. Silitonga Eko Pujiyulianto Elmiawan, Puguh Fahmi, Achmad Gus Fajar, Achmad Fikri, Muhammad Luqman Saiful Fil Isnaeni, Fil Isnaeni Gahana Cindi Alfian, Devia galih, Rene hario Gurun Sangra Yusman, Fardhan Hadi Teguh Yudistira, Hadi Teguh Hery Widijanto Hidayatullah, M Taufik I Made Astra Iffah, Izzatul Imam Prabowo, Imam Isnina, Isnina Jalal, M. Rifky Faisal K, Putra Andi Kardo Rajagukguk, Kardo Kenedi, Akmal Afif Khaerunissa Anbar Istiadi Khairat, Imalatul Khairi, Muhammad Ichwanul Khairunnisa Kornelius Siahaan, Yusuf Lathifa Putri Afisna Manalu, Andrean Prima Jaya Manzeis, Ilhan Maulana, Sena Miswar, Khairul Mudzakir , Mudzakir Mudzakir Mudzakir Muhamad Fatikul Arif Muhammad Syaukani Mukhlisin Mukhlisin Mulyawan Munardy, Munardy Musbar Musbar, Musbar N, Fajar Perdana N, Muhammad Dwi Nanda Syanur, Farid Nur, Tya Shofarina M. Nurdin, Akhmad Nurhayati, Rina NURJAYA NURJAYA, NURJAYA Nurlaisa, Rifa Nurullah, Fajar Perdana Oktaviani, Feny Paundra, Fajar Perdana Nurullah, Fajar Permata, Ariyo Nurachman Satiya Prabowo, Andi Pratama, Angga Jihan Prima Jaya Manalu, Andrean Puandra, Fajar Pujiyulianto, Eko Pujiyuliyanto, Eko Putra Andi Kolala Putra, Aditya Septian Ramadhan Siregar, Ilham Ramadhanty, Nabila Riyadhsyah, Riyadhsyah Riyadhsyah, Teuku Rizky Saputra, Rizky Rojikin, Setiyo Rostika, Reni RUSLI, RAHMATULLAH S, Ardi Bagus S, Farid Nanda Sadono, Fajar Sidik Saputra, Gilang Saputra, Khamid Y. W. Saputri, Hany Sari, Dian Anggria Satria, Arysca Wisnu Setyawati, Annisa Indah Siahaan, Yusuf Kornelius Sidik, M Farhan Sidik, M. Farhan Sidik, Muhammad Farhan Silitonga, Dicky Januarizky Simatupang, Valentino Hasael Sri Bagaskara, Firman Sucipto, Imam Sucipto, Moch. Cahyo Suyadi Suyadi Syahidin Syaikhul Aziz Syamsul Bahri SYANUR, FARID NANDA Tamba, Evasus Tantri Liris Nareswari Wibawa, Gilang Putra Winda Septiani Windrawan, I Gede Yasmin, Dzikrina Salsabila Yudanta, Faturrizky Rakha Yudi Kurniawan Yusman, Fardhan Gurun Sangra Zulfikram, Zulfikram Zulmy, Muhammad Rafli