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PENGARUH SUHU PREHEAT DAN VARIASI ARUS PADA HASIL LAS TIG ALUMINIUM PADUAN TERHADAP KEKUATAN TARIK DAN KEKERASAN Ahmadi, Nurfi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (176.074 KB)

Aluminium has a good nature; corrosion-resistant, lightweight, and able to be recycled. But the connection with welding aluminum is difficult to do so we need the right way this study aims to determine the characteristics of the results of weld aluminum with large variations in preheat temperature and current. Aluminum Alloy AA 3003 TIG welded with Filler ER 5356, a variation current 110 A, 130 A, 140 A and preheat temperature of 75 degree celcius, 125 degree celcius, 175 degree celcius, then welds tested tensile, hardness, and microstructure. The results showed that the variation o f the current 110 A with a preheat temperature of 175 degree C has the highest tensile strength and hardness.

PENGARUH ELECTROPOLISHING PADA BAJA TAHAN KARAT AISI 316L YANG MENGALAMI DEFORMASI DINGIN TERHADAP KEKASARAN DAN KEKERASAN PERMUKAAN UNTUK MENDUKUNG KEBUTUHAN MEDIS Ahmadi, Nurfi
SENATIK STT Adisutjipto Vol 2 (2016): Peran Teknologi dan Kedirgantaraan Untuk Meningkatkan Daya Saing Bangsa
Publisher : Sekolah Tinggi Teknologi Adisutjipto

AISI 316L stainless steel is one of the metals that are widely used to meet medical needs. In its use of these materials must meet several requirements such is violence, corrosion resistance, wear resistance and tenacious. To meet these requirements, the modification techniques continue to be developed, such techniques include electropolishing techniques and cold deformation. This research will be carried out merging technique electropolishing and cold deformation which might be expected to obtain the quality 316L stainless steel is better. Research carried out by deform the specimen with a thick reduction of 40% and then do electropolishing process, then performed the test roughness and hardness on the surface of the specimen. Cold deformation 40% increase surface hardness up 105% from the initial violence. Electropolishing can reduce the surface roughness of up to 14 times.

Effects of Grains Size and Sandblasting Duration to the Surface Hardness of the Casting Product of Used Propeller Ahmadi, Nurfi
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Sekolah Tinggi Teknologi Adisutjipto

This research carried out the sandblasting process on used aluminum propeller castings with variations in sand grains: 40 mesh, 60 mesh, and 80 mesh with variations of 30 seconds, 60 seconds and 90 seconds. The size of the grain and the varying time result in different surface hardness. The biggest hardness on sandblasting with a grain size of 40 mesh time of 90 seconds is 39.8 VHN, 60 mesh time of 30 seconds is 38.6 VHN, 80 mesh time of 30 seconds is 37.1 VHN, from the photo macro the abrasion of the largest surface material occurs at grain size 40 mesh.

RANCANG BANGUN TURBIN ANGIN SAVONIUS 200 WATT Rudianto, Daniel; Ahmadi, Nurfi
SENATIK STT Adisutjipto Vol 2 (2016): Peran Teknologi dan Kedirgantaraan Untuk Meningkatkan Daya Saing Bangsa
Publisher : Sekolah Tinggi Teknologi Adisutjipto

This study aimed to establish the type of Savonius wind turbines that capable of generating electric power of 200 Watts. This objective relates to Bantul District Government program which plans to build wind turbin generating electrical power (Pembangkit Listrik Tenaga Bayu, PLTB) 200 Watt as a backup power source for powering cooling fish caught by fishermen in the southern coast. Savonius Turbine chosen with consideration that it has simple construction so that the cost is not expensive, not depending on the direction of the wind, and is suitable for small power plants.Design of Savonius turbine blade has been completed, the turbine blade height 168 cm and a diameter of 55 cm. Blade turbine mounted on an arm along 55 cm from the turbine shaft and separate 120º. The turbine is supported by a 3-foot-tall turbines framework 2,5 m iron box 4 cm x 4 cm. The test simulated to determine the turbine rotation has been performed at varying wind speeds, i.e. 2 m /s, 4 m /s and 6 m /s.Based on test results, the turbine is capable of rotating an average of 54,2 rpm at a wind speed of 2 m /s; 86,8 rpm at a wind speed of 4 m /s; and 124,2 rpm at a wind speed of 6 m /s. These test results indicate that the Savonius turbines can be used to drive a generator producing the need of electrical energy

Effects of Grains Size and Sandblasting Duration to the Surface Hardness of the Casting Product of Used Propeller Ahmadi, Nurfi
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v4i0.234

This research carried out the sandblasting process on used aluminum propeller castings with variations in sand grains: 40 mesh, 60 mesh, and 80 mesh with variations of 30 seconds, 60 seconds and 90 seconds. The size of the grain and the varying time result in different surface hardness. The biggest hardness on sandblasting with a grain size of 40 mesh time of 90 seconds is 39.8 VHN, 60 mesh time of 30 seconds is 38.6 VHN, 80 mesh time of 30 seconds is 37.1 VHN, from the photo macro the abrasion of the largest surface material occurs at grain size 40 mesh.

Pelatihan Pembuatan Pesawat OHLG untuk Pengembangan Spot Dirgantara di Destinasi Wisata Stone Park Nurdin, Riani; Mauidzoh, Uyuunul; Prattiwi, Elisabeth Anna; Ahmadi, Nurfi; Gunawan, Gunawan; Astuti, Marni; Zabidi, Yasrin
Empowerment : Jurnal Pengabdian Masyarakat Vol. 8 No. 01 (2025): Empowerment
Publisher : Program Studi Ilmu Hukum Fakultas Hukum Universitas Kuningan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25134/empowerment.v8i01.10406

Stone Park is one of the tourist destinations located in Turunan, Girisuko, Panggang, Gunungkidul. The Stone Park tourist destination is currently not widely visited by tourists because it only offers sunrise spot facilities, photo spots, gazebos, and camping areas that have been widely offered by other tourist destinations. To support Sustainable Tourism which can have a long-term impact on the environment, social, culture, and economy, it is necessary to develop attraction spots. The aerosport attraction spot is one of the attraction spots that is quite popular with the public. To provide understanding and skills, training has been held on making and flying the Out Hand Launch Glider (OHLG) Aircraft which was attended by 21 participants consisting of Stone Park tourist destination managers and the surrounding community. The participants were able to understand the need for the development of aerospace attraction spots and succeeded in making and flying the OHLG aircraft.

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