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All Journal Rekayasa Mesin Specta Journal of Technology Jurnal Impresi Indonesia Jurnal Pengabdian Ilung (Inovasi Lahan Basah Unggul) Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
Rohimsyah, Fikan Mubarok
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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.
Studi Pengaruh Kombinasi Pengelasan GMAW dan SMAW dengan Metode WAAM: Studi Pengaruh Kombinasi Pengelasan GMAW dan SMAW dengan Metode WAAM Jatmoko; Hanifah, Anis; Pratama, Muhammad Aditya; Rohimsyah, Fikan Mubarok
SPECTA Journal of Technology Vol. 7 No. 2 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i2.938

Abstract

The development of technology and science is multiplying, so it affects the industrial sector in Indonesia, namely the industry that manufactures machine elements, especially in the automotive sector, which commonly uses metal as raw material. The manufacturing sector's production in the automotive industry tends to increase annually. The need for metal as raw material is constantly increasing. The WAAM welding method be utilized as one of the innovations in the industrial world that potentially reduces the use of raw metal materials by replacing them with the results of the WAAM process. In this study, a combination of GMAW and SMAW welding using the WAAM method was carried out by adding material in layers and switching between the two types of welding. The welding process is carried out by varying the current (high, medium, and low). Then, a tensile test was carried out to determine the mechanical properties of the combination results. Based on the tensile test results, it is known that the high current variation gives the best results, the increasing current lead to an enhancement of the mechanical properties. Finally, using high currents will give the best result for application in the engineering and automotive sector.
Strength Evaluation of Combined New and Old Plates Welded Joint: Case of Anggada XV Tug Boat Nurcholik, Samsu Dlukha; Wahyuda, Wahyuda; Hidayat, Taufik; Arifuddin, Andi Mursid Nugraha; Kurniawati, Diniar Mungil; Saadiyah, Devy Setiorini; Awali , Jatmoko; Rohimsyah, Fikan Mubarok; Trimulyono, Andi; Kusuma, Andhi Indira
Indonesian Journal of Maritime Technology Vol. 2 No. 1 (2024): Volume 2 Issue 1, June 2024
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v2i1.1069

Abstract

Naval grade plate is designed for shipbuilding due to its strength. In the shipyard, old plates have been used because surplusage of the previous project. However, the mechanical properties of old plate compared to new plate have not been clarified yet. In this study, a comparative investigation shielded metal arc welding (SMAW) of old plate and new plate was performed. A spectroscopy test was used to obtain the chemical properties of the old plate and the new plate. Furthermore, tensile and hardness tests were performed to investigate the mechanical properties It was concluded that (1) the chemical properties of the old and new plates are almost similar and (2) the average value of tensile strength of the old-old plate, new-new plate, and new-old plate are 451.3, 487, 454,3 N/mm2, respectively. (3) then, the average hardness test of HAZ of old plate, new plate, and weld metal are 73.2, 78.3, 83.2 HRB, respectively. From the results, it can be concluded that using old plates for shipbuilding is still reliable.
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.
Simulasi Respon Material PLA Berstruktur Sandwich pada Turbin Angin Helix Savonius Airfoil Shape Blade Rohimsyah, Fikan Mubarok; Ramadhani, Muhammad Irvan; Qalbi, Chaerul; Yusariarta, Ade Wahyu
Jurnal Impresi Indonesia Vol. 5 No. 1 (2026): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v5i1.7502

Abstract

Dalam meningkatkan kekuatan struktural turbin angin Savonius, optimasi desain bilah dan pemilihan material menjadi faktor penting terutama untuk operasi pada kecepatan angin rendah. Turbin helix Savonius diketahui memiliki performa lebih baik dibandingkan model konvensional karena desain spiralnya yang menstabilkan torsi, sementara penggunaan airfoil shape blade mampu meningkatkan torsi hingga 10% dibanding tipe U tradisional. Pada penelitian ini, material PLA dipilih karena ringan dan ramah lingkungan, meskipun memiliki kelemahan berupa titik leleh rendah dan sifat rapuh. Untuk meningkatkan performa mekanisnya, digunakan dua variasi struktur, yaitu struktur solid sebagai kontrol dan struktur sandwich re-entrant sebagai struktur inti. Pengujian three-point bending menunjukkan bahwa struktur solid memiliki flexural strength tertinggi sebesar 55 MPa, sedangkan struktur re-entrant memiliki nilai 48,11 MPa. Namun hasil simulasi statis menggunakan Finite Element Method (FEM) memperlihatkan bahwa struktur re-entrant mampu mendistribusikan tegangan Von Mises lebih merata sehingga menurunkan konsentrasi stress pada area kritis blade. Sebaliknya, struktur solid menunjukkan total deformation paling kecil pada pembebanan 0,049 N untuk blade dan 0,1225 N untuk rangkaian turbin, yang menandakan kekakuan struktural lebih tinggi. Hasil simulasi Computational Fluid Dynamics (CFD) pada kecepatan angin 2 m/s menunjukkan bahwa struktur re-entrant menghasilkan pola aliran yang lebih stabil. Secara keseluruhan, struktur solid unggul dalam kekakuan dan flexural strength, sedangkan struktur re-entrant lebih baik dalam distribusi tegangan dan respons aerodinamik.
Perancangan Sistem Fertigasi dan Vermikompos di Kebun Sumber Berkah Kelurahan Batu Ampar Rohimsyah, Fikan Mubarok; Awali, Jatmoko; Muyassir, Nur Aushaf; Rajid, Nabila Faiza Putri; Rahmah, Fadhilah; Aurelya, Meyriska; Rohmah, Hidhayatul Isnaini; Simbolon, Samuel Caesario; Hidayat, Alfito Rafli; Majid, Nurkholis
Jurnal Pengabdian ILUNG (Inovasi Lahan Basah Unggul) Vol 5, No 3 (2026)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/ilung.v5i3.17271

Abstract

Perkebunan Sumber Berkah di Kota Balikpapan merupakan salah satu bentuk penerapan pertanian perkotaan yang berfokus pada budidaya tanaman hortikultura secara berkelanjutan. Permasalahan utama yang dihadapi adalah menurunnya kesuburan tanah akibat penggunaan pupuk kimia serta meningkatnya volume limbah organik rumah tangga. Kegiatan pengabdian masyarakat ini bertujuan untuk meningkatkan pengetahuan masyarakat mengenai pengelolaan limbah organik melalui sosialisasi pembuatan pupuk vermikompos, serta mendampingi mitra kebun dalam penerapan pembuatan dan pemanfaatannya. Metode kegiatan menggunakan pendekatan Participatory Action Research (PAR) yang melibatkan mitra kebun secara aktif dalam setiap tahap pembuatan vermikompos, mulai dari pengumpulan bahan organik, pra-pengomposan, pemberian cacing Lumbricus rubellus, hingga pemanenan selama 30 hari. Hasil kegiatan menunjukkan bahwa penggunaan vermikompos mampu meningkatkan pertumbuhan tanaman hingga 23% lebih cepat dibandingkan tanpa perlakuan, serta membantu mengurangi limbah organik di lingkungan sekitar. Sementara itu, kegiatan sosialisasi kepada masyarakat meningkatkan pemahaman peserta tentang pengelolaan limbah organik sebesar 82%. Inovasi ini diharapkan menjadi langkah nyata dalam mendukung pertanian berkelanjutan, memperkuat ketahanan pangan lokal, dan mendorong penerapan pengelolaan limbah ramah lingkungan di wilayah perkotaan. Kata kunci: Pupuk alami; Sampah organik; Perkebunan Sumber Berkah; Pertanian perkotaan;Vermikompos
Co-Authors Andi Trimulyono Arifuddin, Andi Mursid Nugraha Aurelya, Meyriska Awali , Jatmoko Fadhilah Rahmah Hanifah, Anis Hidayat, Alfito Rafli Jatmoko Jatmoko Awali Kurniawati, Diniar Mungil Kusuma, Andhi Indira Majid, Nurkholis Maulana, M. Arzil Muyassir, Nur Aushaf Pratama, Muhammad Aditya Putra, Ade Wahyu Yusariarta Qalbi, Chaerul Rajid, Nabila Faiza Putri Ramadhani, Muhammad Irvan Rohmah, Hidhayatul Isnaini Saadiyah, Devy Setiorini Samsu Dlukha N Simbolon, Samuel Caesario Taufik Hidayat Wahyuda, Wahyuda Yunita Triana, Yunita