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I Nyoman Pasek Nugraha
Universitas Pendidikan Ganesha
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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The Effect of Variations Temperature in Expansion Valve on The (COP) Coefficient of Performance from An Air Conditioning Engine Prototype Mini Water Chiller Arnawa, I Komang Gede; Wiratmaja, I Gede; Nugraha, I Nyoman Pasek
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.9

Abstract

This experiment aims was to determine the effect of variations temperature in expantion valve on the (COP)Coefficient Of Performance from an air conditioning engine prototype mini water chiller, the prototype mini water chiller was designed by students in the Mechanical Engineering Education, Undiksha. The method used in this research is experimental method. The testing process was carried out at the Refrigeration Engineering Laboratory in Mechanical Engineering Education, Undiksha. In this experiment, the variation of working temperature in  expantion valve is determined from 80C, 110C, 140C, 170C and 200C. The tool used to vary the temperature in expansion valve is a thermoelectric cooler. To calculate the (COP) Coefficient Of Performance from prototype mini water chiller, it is necessary to collect data temperature at every several measurement points at T1, T2, and T4. Then from the data acquisition, data processing is carried out to calculate the (COP) Coefficient Of Performance value. After testing, it was found an effect of variations working temperature in expantion valve on the (COP) Coefficient Of Performance from prototype mini water chiller. The lower working temperature in expantion valve, the (COP) Coefficient Of Performance from an air conditioning engine will increase.
The Effect of Variations in The Distance of the Expansion Valve with The Evaporator on the Performance of the Type Cooling Machine Split AC Alfian, Handi; Wiratmaja, I Gede; Nugraha, I Nyoman Pasek
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.6

Abstract

This research was conducted with the aim of finding the effect of variations in the distance of the expansion valve with the evaporator on the performance of the type cooling machine Split AC. The method used in this research was the experimental method. The variation used in this research were the variation of the distance between the expansion valve and the evaporator by 1 meter, 2 meters, and 3 meters (standard), then the value sought in this study were the room cooling rate and COP (Coefficient of Performance). Data collection in this study was repeated 15 times. From the results of data collection and the calculation process, the room cooling rate has increased compared to the standard distance variation, which were 3 meters, where the highest room cooling rate occurs at a distance of 1 meter variation of 0.0876 Kj/s, so the smaller the expansion valve distance from the evaporator, the smaller the expansion valve distance from the evaporator. room cooling rate increases, and vice versa. And for the COP results from variations in the distance of the expansion valve with the evaporator decreased from the standard distance variation of 3 meters, where the lowest COP occurred at a distance variation of 1 meter by 33.58, so the smaller the distance of the expansion valve with the evaporator, the COP of the cooling machine decreased and vice versa.
The Development of an Egg Incubator Prototype with the Use of Heat on the Condenser Side of the Refrigerator Budiastawan, Ngurah Putu; Wiratmaja, I Gede; Nugraha, I Nyoman Pasek
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.8

Abstract

The development for an egg incubator prototype with the use of heat on the condenser side of the refrigerator belongs to  Research and Development (R&D) conductment with the aim of knowing the process of developing an egg incubator prototype by using heat on the condenser side of the refrigerator to find out the feasibility  level. The method in this study uses Quality Function Deployment (QFD), which is a method used in the early stages of product design and development that makes quality design of a product based on the market quality demand and order of the customer. The prototype development process undergo  several stages, including: preliminary survey to the farmer community, design, instrument validity testing, prototype making, media export testing and small group testing. Based on the calculation of the results of the validity test assessment by the instrument content expert, the content validity value of 1 which refers to the instrument validity criteria table is included in the very high validity criteria. Furthermore, based on the calculation of the validation results from the media expert test and the small group test, it gets a percentage of 100% for the media expert test and a percentage of 95.20% for the small group test and refers to the eligibility level qualification table with a scale of 5 in the very appropriate category without the need for revision, so that the  developed prototype egg incubator  are suitable for use and marketable for the industry.
PENGARUH FRAKSI VOLUME SERAT TERHADAP SIFAT MEKANIS KOMPOSIT MATRIKS POLIMER POLYESTER DIPERKUAT SERAT AGAVE SISAL Aprianto, Gede; Nugraha, I Nyoman Pasek; Dantes, Kadek Rihendra
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 4 No. 1 (2016)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v4i1.8044

Abstract

Penelitian ini bertujuan untuk mengetahui fraksi volume terbaik dari sifat mekanik komposit matriks polimer polyester yang diperkuat serat alam agave sisal. Sifat mekanik yang dimaksud adalah kekuatan impak dan mikrografi. Desain penelitian yang digunakan dalam penelitian ini adalah penelitian eksperimen dengan metode single factor repeated measures design. Pembuatan sampel komposit matriks polimer polyester yang diperkuat serat alam agave sisal menggunakan metode hand lay up. Variasi fraksi volume serat yang digunakan adalah 0%, 20%, 40%, dan 60%. Setiap fraksi volume serat yang diuji, dibuatkan masing-masing 10 (sepuluh) buah spesimen. Data-data yang diperoleh dalam penelitian ini di dapat dari energi serap (Es) pengujian impak yang selanjutnya diolah dan dianalisa menggunakan Anava As. Hasil penelitian menunjukkan bahwa : (1) Fraksi volume serat terbaik dalam pengujian impak adalah fraksi volume serat 40% dengan kekuatan impak sebesar 4.092,00818 J/m2, sedangkan fraksi volume serat terendah adalah fraksi volume serat 0% dengan kekuatan impak sebesar 604,50120 J/m2; (2) Berdasarkan hasil pengujian mikrografi dari patahan hasil pengujian impak menunjukkan bahwa secara umum pola patahan yang terjadi pada komposit adalah kombinasi dari patahan getas (brittle fracture) dan pull-out fibers fracture atau dikenal dengan patahan sikat (brush fracture). Kesimpulan dari penelitian ini adalah fraksi volume serat 40% memiliki sifat mekanik terbaik dibandingkan dengan fraksi volume serat lainnya sehingga dapat dijadikan sebagai salah satu bahan baku alternatif pengganti serat gelas, dimana kekuatan impak yang dihasilkan sebesar 4.092,00818 J/m2. Dilihat dari hasil pengujian mikrografi, secara umum dikategorikan memiliki pola patahan sikat (brush fracture).Kata Kunci : komposit, matriks polimer polyester, serat alam agave sisal, sifat mekanis This research aims to know the best fiber volume fraction on mechanical properties of agave sisal natural fiber which is reinforced by polyester matrix composites. Those mechanical properties are the impact strength and the micrographic. The research design used in this research is an experimental research with single factor repeated measures design method. The manufacture of agave sisal natural fiber which is reinforced by polyester matrix composites specimens used hand lay-up methods. The variations of the fiber volume fraction used were 0%, 20%, 40% and 60%. There are 10 (ten) pieces of specimens for each tested fiber volume fraction. The research data was obtained from specimens absorbed energy (Es). Then, they were processed and analyzed by using Anova As. The result of this research showed that: (1) the best fiber volume fraction during impact testing is 40% with 4.092,00818 J/m2 of the impact strength. Meanwhile, the worst fiber volume fraction is 0% with 604,50120 J/m2 of the impact strength; (2) based on the micrographic test, the fractures from the impact test showed that the pattern of those fractures generally consists the combination of brittle fractures and pull-out fiber fractures. This combination is known as brush fractures. The conclusion of this research is the 40% of fiber volume fraction has the best mechanical properties compared to the other fiber volume fraction. Thus, it can be used as the alternative raw material for fiberglass. The impact strength produced was 4.092,00818 J/m2. Based from the micrographic test, the fraction is categorized as the brush fractures pattern.keyword : agave sisal natural fiber, composite, material properties, polyester polymer matrix
PENGARUH FRAKSI VOLUME SERAT TERHADAP SIFAT MEKANIS KOMPOSIT MATRIKS POLIMER POLYESTER DIPERKUAT SERAT PELEPAH GEBANG Suartama, I Putu Gede; Nugraha, I Nyoman Pasek; Dantes, Kadek Rihendra
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 4 No. 1 (2016)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v4i1.8312

Abstract

Penelitian ini dilakukan untuk mengetahui vraksi volume terbaik yang dapat digunakan sebagai komposit bermatrik polyester dengan penguat serat pelepah gebang. Sifat mekanik yang dimaksudkan adalah kekuatan impak dan foto mikro permukaan patahan hasil uji impak pada komposit ini. Komposit berpenguat serat pelepah gebang dengan matrik polimer polyester ini menggunakan fraksi volume 0% (tanpa serat), 20%, 40%, dan 60% serat dalam komposit sesuai ASTM D 6110-04. Spesimen dibuat sepuluh sampel per fraksi volume untuk mengetahui rata-rata kekuatan spesimen. Selanjutnya data dianalisis menggunakan ANAVA Dari penelitian yang dilakukan diketahui bahwa nilai impak tertinggi ada pada fraksi volume serat 60% yaitu 4.495,04383 J/m3, sedangkan kekuatan impak terendah ada pada fraksi volume 0% (tanpa serat) yaitu 604,50120 J/m3. Pada fraksi volume serat 0%-60% rata-rata mengalami patah getas (brittle) dan mekanisme fiber puul out dan dikategorikan memiliki pola patahan sikat (brush fracture) pada fraksi serat 60%.Kata Kunci : brittle, gebang, impak, komposit, polyester This reserch was conducted to determine the best volume vraksi that can be used as a composite matriks Polyester with fiber amplifier gebang. Mechanical properties is meant impact strength and fracture surface micro photograph impact test results on this composite. Composite fibers gebang with polyester polymer matrix using 0 % volume fraction ( without fiber ) , 20 % , 40 % , and 60 % of the fibers in the composite according to ASTM D 6110-04. The samples speciment volume fractions to determine the average power of the specimen. Furthermore, the data were analyzed using ANAVA. From this research known that the highest impact is on the fiber volume fraction of 60 % which is 4495.04383 J / m3, while the impact strength is lowest at 0 % volume fraction ( without fiber ) is 604.50120 J / m3. In the fiber volume fraction of 0% - 60% on average brittle fracture ( brittle ), fiber puul out and categorized has a fracture pattern brush (brush fracture) on the fiber fraction of 60%.keyword : brittle, gebang, impact, komposit, polyester
PENGARUH VARIASI KECEPATAN PUTARAN MESIN BUBUT TERHADAP KEAUSAN PADA ALAT POTONG PAHAT HSSTIPE BOHLER MO 1/2X4 Dewangga, Sang Putu Fitrah; Nugraha, I Nyoman Pasek; Dantes, Kadek Rihendra
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 5 No. 1 (2017)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v5i1.9238

Abstract

Penelitian ini dilakukan untuk mengetahui seberapa pengaruh perbandingan keausan pahat terhadap putaran Rpm mesin bubut yang divariasikan kecepatannya.Penelitian ini menggunakan pahat HSS BOHLER MO dengan ukuran 1/2x4. Bahan Specimen yang digunakan untuk pengujian ini adalah Besi, Aluminium, kayu. masing masing specimen dibubut dengan putaran Rpm yang berbeda disetiap spesimennya 330 Rpm, 650 Rpm , 950 Rpm. Keausan tepi pahat diukur dengan Jangka sorong digital dan Mikroskop. Dari penelitian yang dilakukan diketahui bahwa Variasi kecepatan putaran mesin bubut menunjukan bahwa pahat HSS Tipe Bohler Mo 1/2X4, pada hasil proses pembubutan spesimen menunjukan perbedaan spesimen, pada variasi kecepatan putaran mesin bubut terdapat perbedaan hasil pembubutan. Terdapat interaksi pada spesimen uji dan variasi kecepatan putaran mesin bubut. Pada pembubutan spesimen besi, aluminium, kayu pada putaran mesin bubut menunjukan keausan pahat yang relative kecil pada putaran mesin bubut tertinggi yakni Rpm 950 mengalami peningkatan keausan pahat tertinggi besi 0,19mm; aluminium 0,04; kayu 0,01mm. Kata Kunci : pembubutan, putaran Rpm, hss bohler mo 1/2x4,Variasi kecepatan This research was conducted to determine how the influence of comparison cuting tools the rounds Rpm Turning Mechine speed is varied. This study uses cutting tools HSS Bohler Mo with the size 1/2x4. specimens used for this study is iron diameter 20 mm X 100 mm 3 much, diameter Aluminium 20 mm X 100 mm 3 much , wood berdiameter 20 mm dengan long 10 cm 3 much. materilals each Turning specimens with round Rpm which will obviously vary 330 Rpm, 650 Rpm , 950 Rpm. The flank wear measured by calipers and microscope. From this research it is known that varying the rotational speed turning mechine shows that Cutting tools HSS Tipe Bohler Mo 1/2X4, the turning process shows that materials, on varying the rotational speed differences result lathe turning. There is no interaction on test specimens and varying the rotational speed lathe. In turning specimens of iron, aluminum, wood round lathe shows the tool wear is relatively small at the highest rotation lathe Rpm 950 The highest increase tool wear iron 0,19mm; aluminium 0,04; wood 0,01mm. keyword : lathing, rotation Rpm, hss bohler mo 1/2x4, speed variation
PENGARUH MEDIA PENDINGINAN TERHADAP SIFAT MEKANIK HASIL PENGELASAN MATERIAL ST 37 Darma, Kadek Budi Susila; Widayana, Gede; Nugraha, I Nyoman Pasek
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 5 No. 1 (2017)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v5i1.9770

Abstract

Penelitian ini bertujuan untuk.Untuk mengetahui pengaruh media pendinginan udara terhadap sifat mekanik hasil pengelasan material ST 37.Dengan metode yang digunakan dalam penilitan ini adalah metode eksperimen dengan variabel bebas adalah media pendingin udara,air laut dan oli dan variabel terikatnya adalah kekuatan impact,kekerasan dan metalografi .Hasil penelitian menunjukan bahwa kekuatan impact tertinggi pada media pendinginan oli dengan nilai impactnya 0,482 joule/mm^2,dan untuk nilai kekerasan tertinggi pada media pendinginan udara dengan nilai kekerasanya 46,42 kg/〖mm〗^2,dari hasil metalografi menunjukan media pendinginan air laut mempunyai sifat yang keras dan getas karena di pengaruhi pendinginan yang cepat,sedangkan pada media pendinginan udara mempunyai sifat yang lunak dan kuat karena di pengaruhi pendinginan yang paling lambat dari media pendinginan oliKata Kunci : Media Pendinginan,Impact,Kekerasan,Metalografi,ST 37 Abstract this research aims to determine the effect of air colling media to the mechanical properties of the weldding material ST 37.The method used in this research is the experimental method is the independent variable air colling media,sea water,and oil,And the dependent variable is the power of the highest impact on oil colling media to impact its value 0,482 joules/mm2,,and for the value of the highest hardness on the air with the air colling media hardness value of 46,42 kg/mm2,and the result showed metallograpic sea water colling media has properties hard and brittle as influenced rapid cooling,where as in air cooling media has the properties of soft and strong as influence slowest cooling of oil colling. keyword : colling media Vehicles, impact, hardness metallograpic, ST 37
PENGARUH PENERAPAN MODEL PEMBELAJARANKOOPERATIF TIPE NHT (NUMBERED HEAD TOGETHER)TERHADAP HASIL BELAJAR TEKNOLOGI DASAR OTOMOTIF SISWA KELAS X SMKN 1 ABANG AMLAPURATAHUN AJARAN 2016/2017 Pramesti, I Gede Yoga; Dantes, Kadek Rihendra; Nugraha, I Nyoman Pasek
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 5 No. 1 (2017)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v5i1.9864

Abstract

Abstrak--- I Gede Yoga Pramesti, 2017. Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe NHT (Numbered Head Together) Terhadap Hasil Belajar Teknologi Dasar Otomotif Siswa Kelas X Smkn 1 Abang Amlapura Tahun Ajaran 2016/2017. Penelitian ini bertujuan untuk mengetahui: Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe NHT (Numbered Head Together) Terhadap Hasil Belajar Teknologi Dasar Otomotif Siswa Kelas X Smkn 1 Abang Amlapura Tahun Ajaran 2016/2017. Penelitian ini merupakan penelitian quasi eksperimen dengan variabel terikat hasil belajar Teknologi Dasar Otomotif dan variabel bebasnya adalah model pembelajaran kooperatif tipe NHT (Numbered Head Together) dan pembelajaran konvensional. Penelitian quasi eksperimen ini menggunakan desain Pretest Posttest Kontrol Group Desaign. Subjek penelitian sebanyak 29 siswa untuk kelas eksperimen dan 29 siswa untuk kelas kontrol. Instrumen yang digunakan adalah dengan test. Data analisis dengan menggunakan independent sample t test pada taraf signifikansi 5% (α=0,005). Hasil ini diperkuat dari output SPSS, diperoleh sig. = 0,000 untuk uji 2 ekor. Jadi, H0 ditolak dan Ha diterima sehingga dapat disimpulkan bahwa terdapat perbedaan hasil belajar yang signifikan antara menggunakan model pembelajaran Numbered Head Together (NHT) dan model konvensional kelas X Pada Mata Pelajaran Teknologi Dasar Otomotif di SMKN 1 Abang Amlapura.Disarankan guru dapat lebih memotivasi siswa untuk lebih mengembangkan keterampilan kooperatif atau bekerjasama dalam kehidupan bermasyarakat siswa. Model pembelajaran kooperatif tipe NHT (Numbered Head Together) perlu terus dikembangkan dan diterapkan pada pokok bahasan yang lain dan perlu adanya penelitian lebih lanjut sebagai pengembangan dari penelitian ini. Salah satu pembelajaran yang mungkin dapat diterapkan.Kata Kunci : Pengaruh, pembelajaran kooperatif, NHT (Numbered Head Together), hasil belajar. Abstract --- I Gede Yoga Pramesti, 2017. Influence of Cooperative Learning Model Application NHT (Numbered Head Together) on the Result of Learning Technology Association of Automotive Class X SMK 1 Abang Amlapura Academic Year 2016/2017. This study aims to determine: Effects of Cooperative Learning Model Application NHT (Numbered Head Together) on the Result of Learning Technology Association of Automotive Class X SMK 1 Abang Amlapura Academic Year 2016/2017. This research is a quasi experimental study results with the dependent variable Automotive Technology Association and the independent variables are cooperative learning model NHT (Numbered Head Together) and conventional learning. Quasi-experimental study using pretest posttest control group design Desaign. The research subjects were 29 students for grade 29 students for the experimental and control classes. The instrument used was the test. Data analysis using independent sample t test at significance level of 5% (α = 0.005). These results were confirmed from SPSS output, obtained sig. = 0.000 for the second test of the tail. Thus, H0 is rejected and Ha is received so that it can be concluded that there are significant differences in learning outcomes between using learning model Numbered Head Together (NHT) and conventional models of class X On Subjects Automotive Technology Association in SMK 1 Abang Amlapura.Disarankan teachers can motivate students to further develop cooperative skills or cooperate in the social life of students. NHT cooperative learning model type (Numbered Head Together) needs to be developed and applied to another subject and the need for further research as the development of this research. One lesson that may be applicable.keyword : Effects, cooperative learning NHT (Numbered Head Together), learning outcomes.
PENGARUH MEDIA PENDINGINAN TERHADAP KEKERASAN DAN STRUKTUR MIKRO HASIL PENGELASAN OXY ACETYLENE PADA MATERIAL BAJA ST-37 Priadi, Made Angga; Nugraha, I Nyoman Pasek; Widayana, Gede
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 5 No. 2 (2017)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v5i2.10397

Abstract

Media pendingin merupakan suatu substansi yang berfungsi dalam menentukan kecepatan pendinginan yang dilakukan terhadap material yang telah diuji dalam perlakuan panas. Penelitian ini bertujuan untuk mengetahui tingkat kekerasan dan pengamatan struktur mikro material baja ST-37 yang dipengaruhi media pendinginan air, udara dan oli serta penelitian ini dapat memberikan bahan referensi bagi lingkup pendidikan teknik mesin dan sebagai acuan di dunia industri dalam menggunakan media pendingin pada proses pengelasan. Adapun jenis metode yang digunakan dalam penelitian ini adalah metode penelitian eksperimen. Terdapat dua jenis variable yang digunakan dalam penelitian ini yaitu variabel bebas yang berupa media pendingin air, media pendingin udara dan media pendingin oli dan variabel terikatnya berupa sifat kekerasan. Dari hasil penelitian yang telah dilakukan dimana kekerasan daerah logam induk dengan media pendingin air memperoleh nilai rata-rata sebesar 63,10 Kg/mm2, pendingin udara memperoleh nilai rata-rata sebesar 65,61 Kg/mm2, dan media pendingin oli memperoleh nilai rata-rata sebesar 62,68 Kg/mm2. Kekerasan pada daerah HAZ dengan media pendingin air memperoleh nila rata-rata sebesar 68,49 Kg/mm2, media pendingin udara memperoleh nilai rata-rata sebesar 71,05 Kg/mm2 dan media pendingin oli memperoleh nilai rata-rata sebesar 70,34 Kg/mm2. Kekerasan pada daerah logam las dengan media pendingin air memperoleh nilai rata-rata sebesar 60,99 Kg/mm2, media pendingin udara memperoleh nilai rata-rata sebesar 61,79 Kg/mm2 dan media pendingin oli memperoleh nilai rata-rata sebesar 60,79 Kg/mm2. Berdasarkan dari hasil yang telah didapatkan baik pada logam induk, daerah HAZ dan logam Las dimana tingkat kekerasan yang lebih baik diperoleh dari proses pendinginan udara dibandingkan dengan media pendingin air dan media pendingin oli dari proses pengelasan oxy acytelene.Kata Kunci : Baja ST-37, Kekerasan Material, media pendinginan. The cooling media is a substance which has a function to determine the speed refrigeneration which carried out of the material that has been tasted by heat treatment. The objective of the research is to know the level of hardness and the observation of steel ST-37 material which is affected by cooling media such as water, air, and oil. Also this research may give a reference for Engineering Department of Education and industry in using cooling media for welding process. There is a method that use in this research, that is called quantitative research. There are two variables that use in this research. Independent variable and dependent variable. An independent variable are water, air, and oil cooling media. On the other hand, a dependent variable is nature of hardness. In this research the researcher got a results where the mean of hardness of the base metal area with the water cooling media is 63.10 Kg/mm2, in air conditioning is 61Kg/mm2, and the oil cooling is 62.68 Kg/mm2. The mean of a hardness in Heat Affected Zone (HAZ) by water cooling media 68,49 Kg/mm2, air cooling media is 71,05 Kg/mm2 and an air cooling is 70,34 Kg/mm2. The mean of Hardness in the weld metal area with water cooling media is 60,99 Kg/mm2, air-cooling media is 61,79 Kg/mm2 and oil-cooling media is 60,79Kg/mm2. Based on the result which has been gotten from base metal, Heat Affected Zone (HAZ), and weld metal where the best hardness level is obtained from air-cooling process rather than water cooling media and oil cooling media from oxy acytelene welding process.keyword : Cooling media, steel ST-37, hardness properties.
PENGARUH VARIASI ARUS TERHADAP KEKUATAN IMPACT DAN KEKERASAN MATERIAL ST 37 MENGGUNAKAN PROSES PENGELASN GAS TUNGSTEN ARC WELDING (GTAW) Kolo, Jaeme Martins; Nugraha, I Nyoman Pasek; Widayana, Gede
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 5 No. 2 (2017)
Publisher : UNIVERSITAS PENDIDIKAN GANESHA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjtm.v5i2.10398

Abstract

Kekuatan hasil lasan dipengaruhi oleh tegangan busur, besar arus, kecepatan pengelasan, besarnya penembusan dan polaritas listrik. Penelitian ini bertujuan untuk mengetahui tingkat ketangguhan, kekerasan dan pengamatan struktur mikro material ST 37 yang dipengaruhi oleh variasi arus 90 amper, 110 amper dan 130 amper serta penelitian ini dapat memberikan bahan referensi bagi lingkup pendidikan teknik mesin dan sebagai acuan di dunia industri dalam menggunakan variasi arus pada proses pengelasan. Adapun jenis metode yang digunakan dalam penelitian ini adalah metode eksperimen. Adapun jenis variabel yang digunakan yaitu variabel bebas yang berupa variasi arus pengelasan 90 amper, 110 amper dan 130 amper dan variabel terikat berupa sifat mekanik hasil pengelasan. Dari hasil penelitian yang telah dilakukan dimana rata-rata ketangguhan impact pada variasi arus 90 amper memperoleh nilai impact 0,481 J/mm2, rata-rata ketangguhan impact pada variasi arus 110 amper memperoleh nilai impact 0,482 J/mm2 dan rata-rata ketangguhan impact pada variasi arus 130 amper memperoleh nilai impact 0,483 J/mm2. Dari hasil penelitian kekerasan vickers pada daerah logam las dengan variasi arus 90 amper memperoleh nilai rata-rata sebesar 63,98 Kg/mm2, variasi arus 110 amper memperoleh nilai rata-rata sebesar 87,44 Kg/mm2, dan variasi arus 130 amper memperoleh nilai rata-rata sebesar 74,93 Kg/mm2. Kekerasan pada daerah HAZ dengan variasi arus 90 amper memperoleh nila rata-rata sebesar 54,58 Kg/mm2, variasi arus 110 amper memperoleh nilai rata-rata sebesar 80,74 Kg/mm2 dan variasi arus 130 memperoleh nilai rata-rata sebesar 70,61 Kg/mm2. Kekerasan pada daerah logam induk dengan variasi arus 90 amper memperoleh nilai rata-rata sebesar 59,66 Kg/mm2, variasi arus 110 amper memperoleh nilai rata-rata sebesar 89,94 Kg/mm2 dan variasi arus 130 memperoleh nilai rata-rata sebesar 78,91 Kg/mm2. Berdasarkan dari hasil yang telah didapatkan baik pada hasil ketangguhan impact dan kekerasan logam induk, HAZ dan daerah logam las dimana hasil ketangguhan impact yang lebih baik diperoleh dari memvariasikan arus 130 amper di bandingkan dengan variasi arus 90 amper dan variasi arus 110 amper dan tingkat kekerasan yang lebih baik diperoleh dari memvariasikan arus 110 amper dibandingkan dengan variasi arus 90 amper dan variasi arus 130 amper dari proses pengelasan Gas Tungsten Arc Welding (GTAW). Kata Kunci : Kata kunci : variasi arus, ketangguhan impact dan Kekerasan, Material ST 37 The strength of the weld is influenced by the arc voltage, the magnitude of the current, the speed of welding, the magnitude of the penetration and the electrical polarity. This study aims to determine the level of toughness, hardness and observation of microstructure ST 37 material influenced by current variations of 90 amperes, 110 amperes and 130 amperes and this study can provide reference materials for the scope of mechanical engineering education and as a reference in the industrial world in using variations Current in the welding process. The type of method used in this study is the experimental method. The types of variables used are independent variables in the form of welding current variations of 90 amperes, 110 amperes and 130 amperes and the dependent variable in the form of mechanical properties of welding. From the results of the research that has been done where the average impact toughness on the variation of 90 amperes current gain value of 0.481 J/mm2, the average impact toughness on the variation of 110 amperes current gain value of 0.482 J/mm2 and the average impact toughness on variation A current of 130 amperes obtains an impact value of 0.483 J/mm2. From the result of research of vickers hardness on weld metal area with variation of 90 amperes current get average value equal to 63,98 Kg/mm2, variation of 110 amperes current get average value equal to 87,44 Kg/mm2, and variation of current of 130 amperes obtain Average value of 74.93 Kg/mm2. Hardness in the HAZ region with a current variation of 90 amperes obtains an average of 54.58 Kg/mm2, a 110 amperes current variation obtains an average value of 80.74 Kg/mm2 and a current variation of 130 obtains an average value of 70,61 Kg/mm2. Hardness in the parent metal region with a current variation of 90 amperes obtains an average value of 59.66 Kg/mm2, a 110 amperes current variation obtains an average value of 89.94 Kg/mm2 and a current variation of 130 obtains an average value of 78,91 Kg/mm2. Based on the results obtained both on impact toughness and hardness of parent metal, HAZ and weld metal areas where better impact toughness results obtained from varying the current of 130 amperes in comparison with the variation of 90 amperes current and 110 amperes current variation and the level of hardness Preferably obtained from varying the 110 ampere current compared to the current variation of 90 amperes and the current variation of 130 amperes of the Tungsten Arc Welding (GTAW) welding process. keyword : Keywords: current variation, impact toughness and Hardness, Material ST 37
Co-Authors Abdi Pranata, I Gede Adisantosa, I Gede Wahyu Denata Agus Adi, I Nyoman Alfian, Handi Aprianto, Gede Aprilia, Dodik ari pradnyana, suta Ariantika, Kadek Arifudin, Andi Armika, I Putu Arnawa, I Komang Gede Arsana, Putu Baskara, Rizal Buddhi Satya Utama Budiastawan, Ngurah Putu Darma, Kadek Budi Susila Deva Supriana, Putu Dewa Gede Hendra Divayana, Dewa Gede Hendra Dewa, I Dewa Gede Darma Permana Dewangga, Sang Putu Fitrah Dewi, L.J.E. Dipa, Dewa Putu Dias Sancaya Dwipayana, Made Krisna Eka Jaya, I Gd Elisa, Edi Fajriyanto, Muhammad Noval Firdaus, Kholid Galang Kawih Gede Agus Widiantara Gede Widayana Gede Widayana Hadi Susanto Haryono, Dimastya Teguh Cipto I Gede Ari Saputra I Gede Made Aditya Tresnajaya I Gede Wiratmaja I Gusti Ngurah Sanjaya, I Gusti Ngurah I Putu Heri Yudistira Kadek Rihendra Dantes Kadir, Ach. Khalil Kayana, I Made Dwi Kayana, Made Dwi Kolo, Jaeme Martins Krisnayadi, Made Hari Luh Joni Erawati Dewi Made Agus Suardana Pinatih Mahayoga, I Kadek Alit Mohammad Zakarianto Nyoman Arya Wigraha Pradana, Putu Surya Pramesti, I Gede Yoga Prayuda, Gede Wisnu Priadi, Made Angga Putera, Ocky Primatara Putra Krisnanandha, Vidsvara Putra, A. A. Pt. Ananta Putra, Anak Agung Kade Semara Putra, I G Ngurah Kusuma Randi Wirdana, I Gede Riandika, Putu Ryan Pratama Putra, Ryan Pratama Satriadyanto, Irawan Suadnyana, Made Budi Suandika, I Komang Adi Suartama, I Putu Gede Subadra, I Nengah Suka Arimbawa, I Kadek Suryantara, Putu Agus Sutrisna, Kadek Wibawa, I Wayan Satya Widiarta, I Wayan Wijaya, Dedik Ananta Wijaya, Kadek Surya Yasa, Kadek Odi Supertama Zurweni Zurweni