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All Journal Jurnal Metalurgi dan Material Indonesia Jurnal Teknologi Bahan dan Barang Teknik Technologic
Wiryolukito, Slameto
Kelompok Keahlian Ilmu Dan Teknik Material, Fakultas Teknik Mesin Dan Dirgantara, Institut Teknologi Bandung
Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Analisis Parameter Proses Atomisasi Sentrifugal Tipe Elektroda Berputar dan Karakterisasi Serbuk Hasil Atomisasi pada Material Baja Paduan: Parameters Analysis of Centrifugal Atomizing Process of Rotating Electrodes Type for Alloy Steel Materials and Characterization of Atomized Powder Thomas Albatros; Dr. Ir. Slameto Wiryolukito
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Small components that have complicated geometry and precise dimensions are suitable to be produced by using powder metallurgy method. In Indonesia, powder metallurgy is not well developed, one of the causes is dependence on imported powders. This study discusses the effect of various parameters of making metal powders using centrifugal atomization machines on the character of the powders produced. The research includes the improvement of atomization tools, powder making, milling process, followed by the characterization process to determine the powder morphology, powder size distribution, and compounds formed from the resulting powder. The process parameters tested in this study are the type of raw material, the anode's rotational speed, and the amount of electric current applied. The raw materials used are reinforced steel, AISI 202, and AISI 304. With variations in rotational speed 4000rpm, 6000rpm and 8000rpm. The increase in rotational speed will reduce the size of the powder, and increasingly make the powder shaped like a ball. The milling process effectively reduces the size of alloy steel with a reduction of up to 89% in the form of angular powder. The XRD results show that the reinforced steel powder produced by atomization produces Fe2O3 and FeO powder, while AISI 202 and AISI 304 produce Cr2MnO4 compounds.
Analisis Hasil Friction Stir Welding Aluminium 5083-H112 Menggunakan Taper Threaded Cylinder Pin dengan Variasi Kecepatan Rotasi dan Translasi: Result Analysis of Friction Stir Welding of Aluminum 5083-H112 Using Taper Threaded Cylinder Pin with Variation in Rotational and Translational Speed Slameto Wiryolukito; Johanes Pratama Wijaya Wijaya
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

The technique of joining aluminum with the conventional fusion welding method is still difficult to be applied, because aluminum series has low weldability, therefore, a new method is developed, friction stir welding (FSW) which is a solid-state welding. In this study, the optimization process of the translation speed was carried out using aluminum 5083-H112 workpiece with a thickness of 10 mm. This optimization process includes observing and testing the effect of translational speed on microstructure, strength, hardness and toughness on the weld area. The tool that is used in this optimization process is a taper threaded cylinder pin type, with pin diameters 4 and 7 mm, pin height 9.5 mm, left hand threaded, and the material used is AISI H13. The optimization process produces 3 translation speed parameters, 31.5 mm/min; 50 mm/min; and 63 mm/min with constant rotational speed, 1250 rpm. These three parameters change the microstructure in the weld area, where there are 3 microstructure areas observed, weld nuggets (WN), thermomechanically affected zone (TMAZ), and heat affected zone (HAZ). Whereas mechanical properties such as strength, hardness and toughness tend to decrease along with the increase in welding translational speed.
ANALISIS GAGAL LEAK TEST PADA PRODUK CYLINDER HEAD TYPE-A HASIL PROSES LOW PRESSURE DIE CASTING DENGAN MATERIAL AC4B DI PT. X Wahyudi Wahyudi; Slameto Wiryolukito
Technologic Vol 11, No 2 (2020): TECHNOLOGIC
Publisher : Politeknik Manufaktur Astra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52453/t.v11i2.299

Abstract

Abstrak--Keadaan yang sedang terjadi pada seksi LPDC di PT. X adalah banyaknya cacat pada produk hasil casting sesuai data cacat pada bulan Januari-Juni 2018 yaitu persentase total cacat tertinggi sebesar 20.64% pada seksi LPDC In Plant dan Next Process di bulan April 2018. Jenis cacat tertinggi pada seksi LPDC In Plant adalah Misrun dinding chain sebesar 3.48% dan pada LPDC Next Process adalah gagal leak test sebesar 4.93%. Hal ini sangat merugikan perusahaan baik dalam biaya produksi yang meningkat dan waktu produksi yang lama. Karakterisasi yang dilakukan pada penelitian ini adalah pengujian leak lest, radiografi (x-ray), optical emission spectroscopy, penetrant, metalografi, SEM, dan uji EDS. Berdasarkan hasil dari karakterisasi yang diperoleh, menunjukkan bahwa produk gagal leak test mengalami cacat internal yaitu shrinkage porosity. Berdasarkan hasil analisis fenomena cacat shrinkage porosity tersebut disebabkan oleh adanya inklusi oksida aluminium yang terbawa ke dalam produk Cylinder Head Type-A yang menjadi inisiasi terbentuknya shrinkage porosity. Terdapatnya oksida aluminium pada produk Cylinder Head Type-A disebabkan oleh waktu transfer molten dari melting furnace yang relatif lama dan jarak auto carrier yang relatif tinggi sehingga turut mempengaruhi waktu pouring ke holding furnace. Kata Kunci: Cylinder Head, Low pressure die casting, leak test, shrinkage porosity, oksida.
PENGARUH FLUX TERHADAP PROSES PENGELASAN A-TIG PADA STAINLESS STEEL AISI 316L Restu Sejahtera Sihotang; Slameto Wiryolukito; Surasno Surasno
Jurnal Teknologi Bahan dan Barang Teknik Vol 1, No 1 (2011)
Publisher : Center for Material and Technical Product

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1966.17 KB) | DOI: 10.37209/jtbbt.v1i1.16

Abstract

Penerapan active flux pada proses las TIG atau A-TIG bertujuan untuk menaikkan penetrasi las sehingga produktifitasnya meningkat. Pengelasan pada bahan tebal penetrasinya meningkat, lapisan lasan berkurang sehingga mengurangi efek cost to cast pada pengelasan multi layer. Dalam penelitian ini dilakukan pengelasan pada bahan AISI 316L dengan 3 jenis serbuk oksida active fluxyaitu: Fe2O3, TiO2, dan Cr2O3, dan sebagai pembanding dilakukan proses las SMAW dengan elektroda AWS A5.4 (E308-16) dan proses las TIG konvensional. Hasil penelitian menunjukkan bahwa penetrasi meningkat dibandingkan terhadap proses pengelasan  konvensional hingga mencapai 22 s.d 50 % dan terhadap proses pengelasan SMAW (49 s.d 83)%. Distorsi proses las A-TIG cenderung menurun dibandingkan  terhadap proses las TIG konvensional dan SMAW. Nilai kekerasan di HAZ dan WM pada semua proses A-TIG terutama proses las A-TIG flux Cr2O3 meningkat secara signifikan. Komposisi δ-ferit di WM semua jenis proses las meningkat, terutama pada proses las SMAW, fraksi volume δ-ferit meningkat secara signifikan.Kata Kunci : TIG, A-TIG, active flux, δ-ferit, SMAW
Co-Authors Johanes Pratama Wijaya Wijaya Restu Sejahtera Sihotang Surasno Surasno Thomas Albatros Wahyudi Wahyudi