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All Journal JURNAL INTEGRASI Jurnal Teknologi dan Riset Terapan (JATRA)
Ari Wibowo
Program Studi Teknik Mesin, Politeknik Negeri Batam
Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering Other

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Analisis Sifat Korosi Galvanik Berbagai Plat Logam di Laboratorium Metalurgi Politeknik Negeri Batam Ari Wibowo
JURNAL INTEGRASI Vol 8 No 2 (2016): Jurnal Integrasi - Oktober 2016
Publisher : Politeknik Negeri Batam

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Abstract

Metal plates have been widely used for practical study in metallurgy laboratory at Batam polytechnic. The metals are low carbon steel, stainless steel, galvanized zinc, aluminum and copper. Two different metals adjacent to each other have very big possibility of corrosion. The corrosion is called galvanic corrosion. Corrosion that occurs between two metals that have a potential difference. In this study, five metal plates were cut with a size of about 20 mm x 150 mm with a thickness 2 mm. Then measured the voltage of the two plates that had been dipped in a 3% NaCl salt solution with a voltmeter. From the results of these measurements take two pairs of metal that has the highest voltage and the lowest. Two pairs of metal that have been subsequently dipped in a 3% salt solution and allowed to stand for 7 days to calculate the corrosion rate. From the measurement results obtained copper-zinc couple has galvanized highest voltage of 0.6 volts and a pair of zinc-aluminium has a lowest galvanized voltage of 0.05 volts and corrosion rate obtained at the highest voltage is 1.457 mm / year and the lowest was 1.457 mm / year.
Analisis Sifat Mekanis Komposit Barium Hexaferrit dengan Penguat Silika Ari wibowo
JURNAL INTEGRASI Vol 8 No 1 (2016): Jurnal Integrasi - April 2016
Publisher : Politeknik Negeri Batam

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Abstract

barium hexaferrite banyak digunakan sebagai bahan magnet. Semakin tinggi kekuatan mekanis bahan tersebut maka akan semakin baik dalam penggunaannya. penelitian ini bertujuan untuk mengetahui pengaruh penambahan komposisi penguat silika dan suhu sintering pada komposit dengan matrik barium hexaferrit terhadap sifat mekanis. Bahan barium heksaferrit yang sudah ada di ball mill sehingga ukuran serbuknya menjadi ≤ 74µm. Serbuk barium hexaferrite yang didapat kemudian dicampur silika dengan komposisi 0%, 1%, 2%, 3%, 4%. Hasil campuran tersebut kemudian dicetak dengan tekanan 23 Mpa sesuai bentuk uji spesimen bending dan impak. Hasil cetakan tersebut selanjutnya disintering pada suhu 1000oC 1100oC dan 1200oC selama 3 jam dengan lingkungan udara. Komposit yang sudah dibuat kemudian diuji dengan uji densitas, uji bending, uji impak, uji struktur mikro. Sifat mekanis terbaik didapat pada komposisi SiO2 1 wt.% dan suhu sinter 1100oC.
Analisis Sifat Mekanis Komposit Barium Hexaferrit dengan Penguat Silika Ari Wibowo
JURNAL INTEGRASI Vol 7 No 2 (2015): Jurnal Integrasi - Oktober 2015
Publisher : Politeknik Negeri Batam

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Abstract

barium heksaferit widely used as a magnetic material. The higher mechanical strength of the material, it will result the better application. This experiment aims to determine the effect of adding silica composition and sintering temperature on barium hexaferrit matrix composites against mechanical properties. Barium hexaferrit material was ball milled so that the size of the powder can be ≤ 74μm. The obtained Barium hexaferrite powder is then mixed with a silica composition of 0%, 1%, 2%, 3%, 4%. The mixture was then pressed with pressure 23 Mpa to shape the hardness, bending and impact test specimens. The green body was then sintered at 1000oC, 1100oC and 1200oC temperature for 3 hours with air environment. Composites already made and then tested with density test, bending test, impact test and microstructure test. Best mechanical properties obtained on the composition of SiO2 1 wt.% And the sintering temperature 1100oC.
PENGARUH FREKUENSI PULSE PENGELASAN GTAW PADA ALUMINIUM ALLOY 6061 Ari Wibowo; Nugroho Pratomo Aryanto; Cahyo Budi Nugroho; Muhammad Ismail
JURNAL INTEGRASI Vol 11 No 1 (2019): Jurnal Integrasi - April 2019
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (312.747 KB) | DOI: 10.30871/ji.v11i2.1002

Abstract

This paper describes the effect of pulse frequency on the properties of microhardness, porosity and macrostructure in GTAW welding. This study used alluminum 6061 as a base metal and without filler metal. Pulse frequency is varied from 0 Hz to 10 Hz. The macrostructure results showed the maximum penetration depth occured at pulse frequency 6 Hz, while the maximum penetration width occured when did not pulse frequency. Micro hardness testing showed that the maximum hardness occured at pulse frequency 6 Hz while the lowest hardness occured at pulse frequency 10 Hz. AA 6061 welding without metal filler produced porosity which can have an impact on the hardness of the weld metal.
ALTERNATIF PENGGANTI PASTA ALUMINA SEBAGAI BAHAN POLISHER UNTUK METALOGRAFI Ari Wibowo; Hanifah Widiastuti; Nurman Pamungkas; Cahyo Budi Nugroho
JURNAL INTEGRASI Vol 12 No 2 (2020): Jurnal Integrasi - Oktober 2020
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/ji.v12i2.2022

Abstract

Polishing have played an important role in the preparation of metallography testing. Poor polishing produce in an unflat and rough surface of the material, resulting an unclear metallography image that is difficult to identified. In general, the material commonly used for polishing is alumina paste. Alumina paste is expensive and takes a few minutes to produce a smooth and flat surface. In this research, polishing was done by using several metal polisher other than alumina paste, these were magic***, auto***, bras**, ki*, menze*** and pri** which are sold cheaply at supermarkets or online stores. Analysis was carried out on the surface of the polishing by these materials and the etching surface. The test results showed that the material that is polished with magic *** has the smoothest surface or has the least residual scratches compared to other materials even compared to alumina paste, but has the disadvantage of corrosion forming on some parts of the surface. The best polishing time was obtained on polishing for 3 minutes
Pengaruh Holding Time Annealing terhadap Perubahan Mikrostruktur Baja Struktur S690QL dan S235JR Ari Wibowo; Hanifah Widiastuti; Nurul Laili Arifin; Nugroho Pratomo Aryanto
JURNAL INTEGRASI Vol 13 No 1 (2021): Jurnal Integrasi - April 2021
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/ji.v13i1.2881

Abstract

The S690 and S235JR structural steels are widely used in heavy equipment for the main frame structure. In general, the fabrication processes of heavy equipment involve welding processes that could change the mechanical properties of the materials. Therefore, in the fabrication process involving those steels, a heat treatment process is carried out after welding to modify the mechanical properties. The heat treatment process is conducted mainly to eliminate residual stresses and to reduce brittleness through the annealing process. In this study, annealing was carried out on the two steels to observe the effect of the heat treatment process on the hardness and microstructure of the material. The annealing process was conducted at 760 oC, holding time varied at 2, 4, 6, 8 and 10 hours, and a cooling rate of 20 oC/hour. After the annealing process, observations with a metallurgical microscope were done to see the final microstructure, followed by testing material hardness using the Rockwell B method. The test results showed that the annealing holding time affected the phases and grain size as well as the hardness of the steel S690 and S235JR. The largest grain size is formed with a holding time of 10 hours while the lowest hardness is also obtained at a holding time of 10 hours. Annealing holding time also affects the phase change from fine bainite to ferrite with large grains on S690 and reduces the size of pearlite on S235JR. The test results also show that long holding time has the potential to cause a decarburization effect on steel.
Pengujian Impact Sambungan Circuseam Pada Pressure Vessel Dengan Pengelasan Multiproses Material SA 516 70N Melalui Production Test Rakha Aditya Aji; Ari Wibowo
Jurnal Teknologi dan Riset Terapan (JATRA) Vol 4 No 1 (2022): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2022
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v4i1.4022

Abstract

Pressure vessels are one of the important components needed in the petroleum sector. A pressure vessel is a vessel that has pressure because it is used to store fluids in the form of liquid or gas which has the characteristics of being resistant to high and low temperatures. The object of this research is a pressure vessel which is operated at a low temperature of -25°C. The pressure vessel is fabricated through multi process welding, namely GMAW (Gas Metal Arc Welding) on the root, SAW (Submerged Arc Welding) on the outside, and FCAW (Flux Cored Arc Welding) on the inside. One of the quality of the welding can be seen from impact testing. Impact testing was carried out on the weld metal and HAZ (Heat Affected Zone) areas in each welding process at -25oC which was preceded by the PWHT (Post Weld Heat Treatment) process. A pressure vessel is considered to comply the standard if the impact test results show the energy absorbed is above 27 Joules. The impact test results show that all test specimens absorb energy above 27 Joules so that they comply the standards for use as pressure vessels and the welding process used can be applied in the manufacture of pressure vessels.
Co-Authors Cahyo Budi Nugroho Hanifah Widiastuti Muhammad Ismail Nugroho Pratomo Aryanto Nurman Pamungkas Nurul Laili Arifin Rakha Aditya Aji