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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Majalah Ilmiah Bahari Jogja Technologic Mechanical Engineering for Society and Industry Journal of Material Processing and Characterization (JMPC)

Mochammad Noer Ilman

Department Of Mechanical And Industrial Engineering, Faculty Of Engineering, Universitas Gadjah Mada. Jl. Grafika 2, Yogyakarta 55281, Indonesia

Author-ID : 285867

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Articles

RANCANG BANGUN SISTEM OTOMASI GERAK LAS MIG GUNA PENINGKATAN KUALITAS SAMBUNGAN LAS Nur Akhmad Triwibowo; Mochammad Noer Ilman; Gesang Nugroho
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2015): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 6 2015
Publisher : Prosiding SNST Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar

Beberapa masalah yang timbul pada penelitian bidang pengelasan adalah tingkat keahlian operator las serta perubahan kondisi fisik dan psikis operator las. Hal ini menyebabkan sambungan las tidak memenuhi standar peraturan las dan kualitas sambungan las tidak konsisten. Penelitian ini bertujuan merancang bangun sistem otomasi gerak las MIG (metal inert gas) agar kualitas sambungan las yang dihasilkan bisa konsisten sehingga mendukung upaya penelitian di bidang pengelasan. Langkah-langkah dalam rancang bangun sistem otomasi gerak las MIG adalah identifikasi kebutuhan pemakai, penetapan spesifikasi alat, design alat, proses manufaktur komponen, perakitan komponen, kalibrasi dan pengujian lintasan gerak. Dengan menggunakan software aplikasi Lasergrav, input perintah diberikan dalam bentuk gambar lintasan, sehingga memudahkan pengguna dalam mengoperasikan alat ini. Lintasan gerak las MIG dapat berbentuk garis lurus dan zigzag. Untuk keperluan pengujian, lintasan gerak dapat berbentuk lingkaran, kotak dan bentuk lain yang lebih rumit mengikuti input perintah yang diberikan. Kecepatan gerak probe las dapat diatur, dapat dimulai dengan kecepatan gerak minimal 1 mm/s dan dinaikkan dengan interval 1 mm/s. Pengujian lintasan gerak menunjukkan hasil yang baik. Sambungan las terlihat lurus dan rapi. Sistem otomasi gerak las MIG yang dikembangkan menunjukkan pergerakan yang cukup bagus dan dapat mendukung upaya penelitian di bidang pengelasan. Kata kunci: kualitas sambungan las, las MIG, otomasi gerak

Improvement of Andong Horseshoe Quality in Yogyakarta City to Support City Tourism Alva Edy Tontowi; Mochammad Noer Ilman; Dawi Karomati Baroroh
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 7, No 1 (2021): March
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

The Zero Kilometer Point is an important route for andong horses in Yogyakarta City. The renovation and replacement of road material with andesite can cause horses to slip because the horseshoes have not been adjusted to the new road material. If neglected, it can harm the horses and its owners, reducing the tourism industry in Yogyakarta. On the other hand, horseshoes demand is still met by small and medium enterprises (SME) without a well-standardized system. After doing technical testing to the existing horseshoe design, several alternative solutions were obtained for horseshoe redesign (1) by adding rubber pads and (2) serrated without rubber pads. Based on analysis and testing, it was found that horseshoe with the addition of rubber by 40% was able to increase the friction value to 0.54 or 10% from the initial condition. Besides improving the productivity and quality of SME horseshoe products, several solutions should be considered, including (1) change the layout design of SME by implementing 5S lean six sigma principles and (2) apply new methods/technology to maintain the standardization of horseshoe product. Implementation of both solutions will guarantee not only the quality product but also SME production. It is hoped that all the improvements that have been made will increase the quantity and quality of horseshoe products. Then it will also be able to improve the image of Yogyakarta City as a tourist city.

PENGARUH TEMPERATUR PREHEAT TERHADAP DISTORSI DAN STRUKTUR MIKRO SAMBUNGAN LAS TAK SEJENIS ANTARA BAJA KARBON ASTM A36 DAN BAJA TAHAN KARAT AUSTENITIK AISI 304 MENGGUNAKAN GMAW Danny Wicaksono; Mochammad Noer Ilman
Technologic Vol 12, No 1 (2021): TECHNOLOGIC
Publisher : Politeknik Manufaktur Astra

Sambungan las pada umumnya adalah titik lemah dari suatu struktur dan sering menjadi lokasi kegagalan pada pengelasan logam tidak sejenis. Berbagai upaya telah dilakukan untuk meningkatkan kualitas dan performa dari sambungan las, salah satunya adalah pemanasan awal (preheat). Penelitian ini bertujuan mempelajari pengaruh temperatur preheat terhadap sambungan las logam tak sejenis antara baja paduan rendah dan baja tahan karat austenitik. Proses pengelasan dilakukan menggunakan las busur logamgas atau gas metal arc welding (GMAW) dengan elektrode ER70s-6 dan selama proses pengelasan dilakukan preheat pada temperatur 100oC, 150oC, dan 200oC. Temperatur selama proses pengelasan diukur menggunakan termokopel pada jarak 10 mm dari garis las. Setelah proses pengelasan dilakukan, pengukuran distorsi dilakukan menggunakan dial indicator. Pengamatan struktur mikro dilakukan pada daerah terpengaruh panas (HAZ), daerah las, dan daerah logam induk dari masing-masing pelat yang dilas menggunakan mikroskop optik. Berdasarkan hasil pengukuran siklus termal, dapat disimpulkan bahwa peningkatan temperatur preheat meningkatkan temperatur puncak dan memperlambat laju pendinginan las. Perubahan siklus termal ini berpengaruh terhadap struktur mikro. Berdasarkan hasil pengukuran distorsi, pelat yang dilas mengalai penurunan distorsi pada arah longitudinal dan transversal terhadap garis las seiring dengan meningkatnya temperatur preheat

A Preliminary Study of Extraction and Characterization of Nanocrystalline Cellulose (NCC) from Ramie Fiber K Kusmono; Muhammad Waziz Wildan; Mochammad Noer Ilman
Journal of Material Processing and Characterization Vol 1, No 1 (2020): Articles
Publisher : Departmen Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada

Nanocrystalline cellulose (NCC) is today’s one of rapidly growing nanocomposite reinforcing materials. This is thanks to some advantages that come with it over anorganic nanocomposite reinforcing materials, for example, nanoclay, nanosilica, nanoalumina, carbon nanotubes, among others. Some of the advantages of NCC are environment-friendliness due to being organic-compound-based, high mechanical property, and easy manufacturing. NCC can be extracted from natural cellulose sources, such as natural fiber, wood, and animals. One of the natural fibers rich in cellulose content, in this case around 80%, is fiber of ramie which is ubiquitous in Indonesia. It is well known that the acid hydrolysis method is an easy route to NCC fabrication. A number of chemical treatments like de-waxing, bleaching, and alkaline treatment are typically performed prior to acid hydrolysis process. The effect of such chemical treatments as precursors of alkaline hydrolysis on ramie fiber characteristics was investigated in this research. Firstly, ramie fiber was cut 1 cm in size, then grinded and sieved. The fiber was then subjected to de-waxing process by adding it into a toluene-ethanol solution (1:2). Then, it was submitted to bleaching with 0.7% sodium chlorite (NaClO2) solution at 75 °C for 1 hour. Lastly, the fiber was subjected to an alkaline treatment in 2% NaOH solution for 2 hours. Characterization with FT-IR, XRD, and TGA of the fiber which had underwent a number of surface treatments was conducted. Results show that the chemical treatments had successfully removed amorphous components like lignin and hemicellulose from the ramie fiber. Chemical treatments were proven able to increase the crystallinity index and thermal stability of ramie fiber.

The Influence Of Kalium Cromate Inhibitor On Corrosion And Fatique Crack Growth Of Aluminium Alloy 2024-T3 In The Sea Water Environment Waris Wibowo; Mochammad Noer Ilman
Majalah Ilmiah Bahari Jogja Vol 17 No 1 (2019): Februari
Publisher : Sekolah Tinggi Maritim Yogyakarta

Aluminium paduan seri 2024-T3 telah banyak diaplikasikan pada industri kapal laut karena memiliki ketahanan korosi yang relatif baik, tetapi rentan bila digunakan di lingkungan korosif seperti air laut. Untuk mengendalikan korosi banyak metode yang digunakan salah satunya dengan pemakaian inhibitor. Penelitian ini bertujuan untuk mempelajari pengaruh inhibitor kalium kromat (K2CrO4) dalam menurunkan laju korosi dan laju perambatan fatik pada Al 2024-T3. Pengujian laju korosi dengan menggunakan metode sel potensial tiga elektroda yang dilakukan di lingkungan air laut dengan menambahkan inhibitor, sementara itu untuk menguji laju perambatan fatik dengan menggunakan eksperimen fatik dengan stress rasio (R) = 0,1 dan frekuensi 15 Hz. Lingkungan korosi berupa air laut yang ditambahkan inhibitor K2CrO4 dengan konsentrasi 0,1%; 0,3% dan 0,5%. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi inhibitor K2CrO4 cenderung menurunkan laju korosi dan mencapai kondisi minimal dan stagnants pada konsentrasi 0,5% sebesar 0,0134 mm/year (penurunan 38%), serta pada kondisi ini penurunan laju perambatan retak fatik (korosi fatik) terjadi pada ∆K rendah yaitu < 15 MPa. m1/2.

Microstructures and mechanical properties of friction stir dissimilar AA2024-O/AA6061-T6 welded joints at varying tool rotational speeds Sumarno, Diana Puspita; Ilman, Mochammad Noer
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.13499

Friction Stir Welding (FSW) is an innovative solid-state welding technique, especially for joints of unweldable metals or even dissimilar metals. In this study, FSW processes of two dissimilar metals, namely AA2024-O and AA6061-T6, were done at different tool rotational speeds of 910, 1500, and 2280 rpm whilst the welding speed was kept constant at 30 mm/min. This research was intended to improve the mechanical properties of the dissimilar FSW joints. A cylindrical pin-equipped tool was selected, and it was tilted at an angle of 2o during welding. Afterwards, microstructural observations, microhardness, and tensile tests were done. Results demonstrated that increasing tool rotation increased the peak temperature, accompanied by better mixing of different metals in the weld nugget zone (WNZ), hence resulting in improved microstructural homogeneity. The hardness distributions for all dissimilar FSW joints were characterized by the appearance of a high hardness region in the central part of WNZ, resulting in a peak of hardness. It was obtained that the FSW joint at 1500 rpm revealed the best ultimate tensile strength (UTS) around 170.38 MPa, which could be a result of precipitation hardening combined with a better homogeneity in WNZ.

Co-Authors Alva Edy Tontowi Danny Wicaksono Dawi Karomati Baroroh Gesang Nugroho Kusmono Muhammad Waziz Wildan Nur Akhmad Triwibowo, Nur Akhmad Sumarno, Diana Puspita Waris Wibowo

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