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All Journal Multitek Indonesia : Jurnal Ilmiah Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Jurnal Vokasi Journal of Welding Technology Jurnal Teknologi Jurnal Polimesin Jurnal Mesin Sains Terapan Journal of Mechanical Engineering and Fabrication
Usman Usman
Jurusan Teknik Mesin , Politeknik Negeri Lhokseumawe
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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PELATIHAN PENGELASAN FABRIKASI PRODUK MOVEABLE HAND WASHER UNTUK PEMUDA PUTUS SEKOLAH DESA MESJID PUNTEUT KECAMATAN BLANG MANGAT KOTA LHOKSEUMAWE Azwinur, Azwinur; Zulkifli, Zulkifli; Usman, Usman; Zuhaimi, Zuhaimi; Yusuf, Ilyas
Jurnal Vokasi Vol 5, No 1 (2021): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v5i1.2038

Abstract

Desa Mesjid Peunteut merupakan salah satu desa yang terletak di Kecamatan Blang Mangat, Kota Lhokseumawe. Permasalahan utama desa ini adalah masih rendahnya tingkat pendidikan masyarakat yang merupakan salah satu faktor yang berkontribusi memberikan rendahnya tingkat perekonomian desa. Solusi berdasarkan prioritas permasalahan adalah pelatihan pengelasan SMAW untuk pemuda putus sekolah yang masih usia produktif, solusi ini juga sesuai dengan misi pemerintah disaat kasus Covid19 ini sebagai bentuk program prakerja untuk mengurangi tingkat pengangguran didaerah. Target luaran yang akan dicapai adalah pekerja bengkel las memperoleh pengetahuan dan keahlian tentang cara mengelas menggunakan las SMAW, adapun produk yang bisa dihasilkan dari pelatihan ini adalah para peserta bisa membuat produk Moveable Hand Washer (MHW) merupakan perangkat untuk mencuci tangan guna mengatasi penyebaran covid-19. Luaran pengabdian adalah peserta akan memperoleh sertifikat, dan juga artikel pengabdian ini akan di publikasi jurnal Vokasi. Adapun rencana kegiatan yang akan dilakukan adalah teknik pelatihan dengan alokasi materi teori 30% dan praktek 70% yang diikuti oleh 5 orang peserta yang berasal dari desa Mesjid Punteut. Pelatihan dilakukan di Laboratorium Pengelasan dan Fabrikasi Logam, Jurusan Mesin Politeknik Negeri Lhokseumawe. Jumlah peserta yang mengikuti program pelatihan ini berjumlah 5 orang. Dari hasil evaluasi yang dilakukan, terlihat seluruh peserta sudah memahami secara benar semua materi evaluasi yang mencakup prinsip pemotongan pipa dengan mesin otomatis serta keselamatan kerja pemakaian alat. Keseluruhan peserta dapat dikategorikan lulus dengan memperoleh nilai rata-rata 85. Nilai tersebut dapat dijadikan indikator kesuksesan pelatihan ini dalam mencapai sasaran pelatihan. Kata kunci : Pengelasan; SMAW; Elektroda; Kekuatan las; Moveable Hand Washer
Rancang Bangun Mesin CNC Laser Engraving Berbasis Arduino untuk Edukasi Teknologi CNC Kasim, Bukhari; Usman, Usman; Sumardi, Sumardi; Razi, Muhammad; Saputra, Edi; Harmin, Amalia
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 11, No 1 (2025): April
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v11i1.11693

Abstract

Mesin laser engraving CNC merupakan suatu alat yang dapat digunakan untuk memotong dan mengukir berbagai jenis material dengan tingkat presisi yang tinggi. Penelitian ini bertujuan untuk merancang dan membangun mesin laser engraving CNC sebagai media pembelajaran bagi mahasiswa Jurusan Teknik Mesin. Proses perancangan meliputi pemilihan komponen, pembuatan rangka, dan integrasi sistem kendali berbasis Arduino controller dan software GRBL. Mesin ini dirancang untuk digunakan dalam kegiatan demonstrasi dan praktikum terkait prinsip kerja mesin CNC, pemrograman, dan pengoperasian sistem kendali numerik pada mesin. Hasil penelitian menunjukkan bahwa gerak sumbu x, y, z sebelum dikalibrasi memiliki error sebesar 80,6%, 78,2%, 76,3% dan setelah dikalibrasi sebesar 0,2%, 2,3%, 0,3% untuk setiap sumbu secara berurutan. Nilai error ini turun menjadi 0,2%, 2,3% dan 0,3% setelah proses kalibrasi sumbu x, y, dan z. Hasil tersebut menunjukkan bahwa mesin laser engraving CNC yang dibangun dapat berfungsi dengan baik, menghasilkan ukiran dan pemotongan yang presisi sesuai dengan spesifikasi yang diberikan. Penggunaan mesin ini sebagai media pembelajaran diharapkan dapat meningkatkan pemahaman mahasiswa di bidang manufaktur modern dan teknologi CNC, serta memperkuat keterampilan teknisnya
The effect of TIG welding technology parameters on the weld quality of copper material joints for heat pipe applications Azwinur, Azwinur; Kusuma, M. Hadi; Usman, Usman; Dharma, Surya
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.6058

Abstract

Copper is a commonly used material for heat pipe fabrication using the welding process. However, welding copper to copper presents significant challenges due to its inherent material properties. Its exceptionally high thermal conductivity facilitates rapid heat dispersion, complicating the maintenance of a stable melting zone. Furthermore, copper is prone to oxidation, which generates brittle oxides that can adversely affect weld quality. This research paper examines the relationship between TIG welding parameters—specifically current, voltage, shielding gas flow rate, and filler rods—and the mechanical properties of the resulting heat pipe material. The study involves varying the welding current at levels of 120 A, 135 A, and 150 A, along with different types of filler rods. The results indicate that both the selection of welding current and the type of filler rod significantly influence the tensile strength of copper welded joints. Notably, the use of higher currents in ERCuSi-A welding tends to decrease hardness in the HeatAffected Zone (HAZ), while producing more complex variations in hardness within the Weld Metal (WM), dependent on the interplay between heat and the chemical composition of the filler rod. Additionally, nickel in the ERCuNi filler rod contributes to an increase in weld hardness.
Evaluation of worker body posture in the ice block moving process using the Rapid Entire Body Assessment (REBA) method Azwinur Azwinur; Ziyad Muammar; Usman Usman
Journal of Mechanical Engineering and Fabrication Vol. 3 No. 1 (2026): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v3i1.31

Abstract

Ergonomics is an important aspect in the industrial work environment, especially in maintaining worker well-being and increasing productivity. One of the main factors in ergonomics is the worker's posture during work activities, which has the potential to cause musculoskeletal disorders (MSDs). CV XYZ, which is engaged in ice block production in Lhokseumawe, has a production capacity of up to 1,200 ice blocks per day with a work process that is still dominated by manual activities. Based on the results of initial observations, complaints of pain were found in the workers' waist and right shoulder, which indicates an ergonomic risk. This study, aXYZ, analyses the relationship between work posture and MSD complaints using the Rapid Entire Body Assessment (REBA) method. The study was conducted descriptively and qualitatively through direct observation, interviews, and literature studies. The REBA assessment was carried out by measuring the body angles at the neck, back, arms, wrists, and legs during work activities. The results showed that for the first worker, the activity of removing ice blocks from the mould received a REBA score of 10 (high risk), while the process of arranging ice into vehicles received a score of 7 (moderate risk). For the second and third workers, each work activity received a score of 7 (moderate risk). These results are supported by Standard Nordic Questionnaire (SNQ) data, which indicated that the dominant complaints were in the shoulders and waist due to repetitive movements and non-ergonomic work postures. It can be concluded that several work activities pose ergonomic risks that require immediate improvement, particularly the process of removing ice cubes from the mould. Improvements can be made through the use of more ergonomic tools and improved work methods to reduce the risk of injury to workers
Thermal distribution and macrostructural characteristics of TIG-welded Cu/SS316L dissimilar joints: experimental and numerical study Azwinur Azwinur; Agus Suprihanto; Mukhsinun Hadi Kusuma; Khoiri Rozi; Usman Usman; Surya Dharma; Hamdani Hamdani
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.7838

Abstract

Dissimilar welding of copper (Cu) and Stainless Steel 316L (SS316L) presents significant challenges due to their large differences in thermal conductivity and melting temperature, which lead to asymmetric heat distribution and non-uniform penetration. This study aims to evaluate the effect of welding current on temperature distribution and macrostructural characteristics of TIG-welded Cu/SS316L joints using ERCuSi-A filler through an integrated experimental and numerical approach. Welding experiments were conducted at three current levels: 120 A, 135 A, and 150 A on 2.7 mm thick plates. Macrostructural examinations were performed to assess weld bead geometry and penetration behavior. Transient thermal simulations were carried out using ANSYS Workbench to predict temperature fields and thermal gradients. The results indicate that welding current significantly influences weld morphology and thermal behavior. At 120 A, the weld bead was relatively narrow with limited penetration on the Cu side due to rapid heat dissipation. At 135 A, a more uniform fusion profile was achieved, with simulated peak temperatures exceeding 1000°C and an improved penetration balance between Cu and SS316L. At 150 A, deeper penetration into SS316L was observed; however, the heating cycle became shorter and the temperature distribution more localized. Numerical results consistently showed asymmetric temperature fields, where heat diffused rapidly into Cu and concentrated in SS316L. The strong correlation between simulation and macrostructural observations confirms that thermal distribution governs weld geometry and penetration behavior. The 135 A current provides the most balanced fusion characteristics, making it suitable for Cu/SS316L dissimilar joints in heat-transfer applications.
Multifunctional performance validation of coconut frond fibre-reinforced composite prototype for automotive interior application Muhammad Habibi; Rizki Suwanda; Wardhiah Wardhiah; Maisarah Maisarah; Muhammad Iqbal; Usman Usman
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9196

Abstract

The automotive industry increasingly demands sustainable, multifunctional materials for interior components to simultaneously reduce environmental impact and improve occupant comfort. This study presents a comprehensive experimental validation of a coconut frond fibre-reinforced composite prototype intended for automotive door trim panel application. The prototype, developed at Technology Readiness Level (TRL) 2, was evaluated across three critical performance domains: mechanical properties (tensile, flexural, impact, and hardness), acoustic performance (sound absorption coefficient), and thermal characteristics (thermal conductivity and heat deflection temperature). Specimens were prepared and tested in accordance with internationally recognised standards (ASTM D3039, D790, D256, D2240, E1050, E1530, D648). Mean and standard deviation from five replicate specimens per test revealed tensile strength of 28.0 ± 1.4 MPa, flexural strength of 48.1 ± 0.8 MPa, impact toughness of 7.59 ± 0.54 kJ/m², and Shore D hardness of 69.4 ± 1.1. Acoustic evaluation yielded a Noise Reduction Coefficient (NRC) of 0.37 ± 0.01, with a peak absorption coefficient of 0.53 at 1000 Hz, significantly outperforming conventional ABS and PP interior materials. Thermal conductivity was measured at 0.142 ± 0.003 W/mK, which is lower than commercial ABS, while the heat deflection temperature of 93.0 ± 0.9°C exceeds the maximum cabin operating temperature of 85°C. All 11 evaluated parameters met or exceeded their respective automotive-grade target specifications, confirming TRL 3 achievement and suitability for advancement to TRL 4 environmental validation. Scanning electron microscopy (SEM) analysis revealed moderate fibre–matrix interfacial bonding with fibre pull-out as the dominant failure mechanism. The findings establish a robust technical database for the future scale-up and industrial adoption of this bio-based composite.
Co-Authors - Marzuki Adi Saputra Ismy Agus Suprihanto Amalia Harmin Amalia, Ismi Anwar Fuadi Ariefin Ariefin Aris Mauliza Azwinur Azwinur Bukhari Bukhari Cut Aja Rahmawati Edi Saputra Elfiana, E. Hamdani Hamdani Indra Mawardi Khoiri Rozi M. Hadi Kusuma Maisarah Muhammad Adam Pratama Muhammad Habibi Muhammad Iqbal Muhammad Nur Muhammad Razi Muhammad Sami Mukhsinun Hadi Kusuma Nawawi Juhan Nurdin Husin Pardi, P. Qadir Sadri Ridwan, Ridwan Rizki Suwanda Saifuddin MN Saifuddin MN Saifuddin Saifuddin Saifuddin Saifuddin Saifuddin Saifuddin Sami, Muhammad Samsul Bahri Sumardi . Surya Dharma Surya Dharma Wahyu Agung Almuzikri Wardhiah Wardhiah Yusuf, Ilyas Zahlul Munir Zaini Zaini Ziyad Muammar Zuhaimi Zuhaimi Zulkifli Zulkifli