PENGARUH VARIASI TEMPERATUR DAN HOLDING TIME DENGAN MEDIA QUENCHING OLI MESRAN SAE 40 TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA ASSAB 760

The purpose of this study was (1) Determine the influence of temperature variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760, (2) Knowing the effect of holding time variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760, (3) Knowing the interaction of temperature variation and holding time variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760. This research uses experimental methods. Objects in this study is ASSAB 760 medium carbon steel, the product of the Associated Swedish Steels AB (Assab Steels) Stockholm, Sweden, with the chemical content of 0.50% C, 0.60% Mn, 0.30% Si and 0.04 S %. Data analysis techniques in this study using descriptive data analysis results graphically illustrate the tables, histograms, graphics, and images of microstructures. As an input parameter in analyzing the data include: temperature variation (800 °C, 840 °C, and 880 °C), holding time variation(15 minutes, 25 minutes, and 35 minutes), microstructure, and hardness. The results showed a change in the level of hardness and the microstructure formed. From the hardness test results obtained the highest level of hardness in the specimen temperature 800 °C with holding time of 35 minutes 27.66 HRC consecutive lows towards the specimen temperature of 840 °C with holding time 35 min and temperature of specimens 880 °C with holding time of 35 minutes 24.33 HRC, 840 °C specimen temperature and holding time 25 minutes at 24 HRC, the specimen temperature of 880 °C with holding time of 25 minutes 23.33 HRC, specimen temperature of 840 °C with holding time of 15 minutes 22.33 HRC, the specimen temperature 800 °C with holding time 25 minutes at 22 HRC, the specimen temperature of 880 °C with holding time of 15 minutes 21.33 HRC, specimen temperature of 800 °C with holding time of 15 minutes 19.33 HRC, and the lowest rate is specimens of raw material 8 HRC . Microstructure test shows microstructure of raw materials consists of ferrite and pearlite with impartial large crystals form and in accordance with the carbon content of 0.50 % and in the group of the hardening specimens with quenching media Mesran SAE 40 oil, new microstructure is obtained martensite is the main structure in increasing steel hardness . From the research it can be concluded that the variation of temperature and holding time variation with quenching media Mesran SAE 40 oil can change the microstructure and increases hardness of steel ASSAB 760 with the highest hardness value of the specimen temperature of 800 °C with holding time of 35 minutes 27.66 HRC. Keywords: temperature variation, holding time variation, microstructure, hardnes

STUDI TENTANG KUALITAS HASIL REPAIR WELDING PADA CAST WHEELS ALUMINIUM DENGAN METODE PENGELASAN OKSI ASETILIN, TIG DAN MIG TERHADAP SIFAT FISIS DAN MEKANIS

The purposes of this research are: (1) To determine the effectchemical composition and microstructure of arearepairweldingresultswithoxyacetylene, TIGandMIG weld methodon aluminium castwheels. (2) To determine thehardnessand impact toughnessathigh of arearepairweldingresultswithoxyacetylene, TIGandMIG weld methodon aluminium castwheels. The research has donein the laboratory ofINLASTEKSurakarta. Type of this research is descriptive qualitative uses experimental methods.The Object in this research used arealuminium castwheels. Techniques of data analysis in this research using descriptive data analysis that is directly observed experimental results are then analyzed and summing up the results of the research. As an input parameter in analyzing the data include:the testing of chemical composition, microstructure, hardnessandimpact. From the research, we can conclude that the chemical compositionon aluminium castwheelsincludingalloyAluminum Silicon, because the element Si alloyisthe largest, ie7.38%Si. The highesthardness number ofoxyacetyleneweldingresultsby54.80BHNinthe weld areaand38.69BHNinthe HAZ. The lowesthardness number ofMIGweldingresultsby44.18BHNinthe weld areaand TIG welding results by 38.69BHNinthe HAZ. The highestimpact number ofresults TIG welding with impact number average0.114joules /mm². The lowestimpact number ofresultsoxy-acetylene welding with impact number average0.085joules/mm

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BONGGOL SINGKONG DENGAN AKTIVASI FISIKA

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BONGGOL SINGKONGDENGAN AKTIVASI FISIK

ANALISIS KUALITAS HASIL REPAIR WELDING TERHADAP SIFAT FISIS DAN MEKANIS PADA CAST WHEEL ALUMINIUM DENGAN METODE PENGELASAN OKSI-ASETILIN

The purposes of this research are: (1) To know microstructure oxy- acetylene welded joints in aluminium cast wheel.,(2) To know hardness aluminium cast wheel before and after oxy-acetylene welding.,(3) To know the impact strength in aluminium cast wheel before and after oxy-acetylene welding From the research, we can conclude that the chemical composition on aluminium cast wheel including alloy Aluminium Silicon, because the element Si alloy is the largest, ie 7.38% Si. Microstructure on base metal granules the spread equally on the surface of Al. Specimen hardness value raw material higher than oxy-acetylene welding specimens. The average value of raw material hardness results 57.58 BHN while the average value of oxy-acetylene welding results 54.80 BHN. Average hardness oxy-acetylene welding specimens in the HAZ area 38.69 BHN. The average value of raw material impact results 0,12 J/mm² while the average value of oxy-acetylene welding results 0,085 J/mm². Keywords: oxy-acetylene welding, aluminium cast wheel, physical and mechanical propertie

ANALISIS STRUKTUR HASIL REPAIR WELDING TENTANG SIFAT FISIK DAN MEKANIK PADA CAST WHEEL ALUMINIUM DENGAN METODE PENGELASAN MIG

This research aim to determine the chemical composition of the aluminum alloys, microstructure, hardness and impact strength before and after MIG welding method on the aluminum cast wheel. The electrodes used in the welding process is ER 535. The material used in this study is aluminum cast wheel with specifications: dimensions 16x7, PCD 4x120 product type of E35. The testing methods conducted in this study are chemical composition, microstructure test, hardness test and impact test. The equipment used are Spectrometer Metal Scan, Olympus Metallurgycal Microscope, Brinell Hardness Tester and Charpy Tester. The test results showed that the chemical composition of the aluminum cast wheel contains elements of 91.36% Al, 7.38% Si, and 0.803% Fe as well 0.05% Cu and Mg. The test results show that the microstructure of Al grain structure in the HAZ region fused with primary aluminum (α-Al) and grain Si Si alloy formed between the primary α-Al. The results of hardness test show that in the raw materials specimens is 57.56 kgf/mm², in the weld area is 44.20 kgf/mm² and the HAZ is 37.73 kgf/mm². The results of impact test on the raw material is 0.118 Joule/mm², while the weld area is 0.067 Joules/mm². The results of the test show that, hardness and impact strength due to welding less than the raw material on the aluminum cast wheel. Keywords: Cast wheel, aluminium welding, MIG welding, repair welding, material testing

UPAYA MENINGKATKAN KEAKTIFAN DAN HASIL BELAJAR SISWA DALAM PEMBELAJARAN SISTEM PENDINGIN DENGAN MENGGUNAKAN MEDIA AUDIO VISUAL PADA SISWA KELAS X PROGRAM KEAHLIAN TEKNIK KENDARAAN RINGAN SMK NEGERI 1 MONDOKAN SRAGEN TP 2011/2012

The purpose of this research are: (1) To determine the level of students' understanding of the material cooling system, (2) To determine the use of multimedia technologies will have an impact in the field of education, so that it must be addressed by creating a new instructional media or develop existing there, (3) To determine the effect of the use of audio-visual media to the increased activity and student learning outcomes in SMK Negeri 1 MondokanSragen. This type of research is Classroom Action Research (CAR) conducted in two cycles, each cycle consisting of: (1) action planning, (2) implementation of actions and observations, and (3) Reflection. Subject implementing measures in this study is an observer and subject teachers Cooling System, while class X-3 Light Vehicle Engineering SMK Negeri 1 MondokanSragen number of 32 students as subjects receiving action. Data collection methods used were observation, interviews, documentation and field notes. The technique of data analysis is descriptive comparative, quantitative description and qualitative description that consists of data collection, data reduction, and data presentation, drawing conclusions. The results show that this class action: (1) The utilization of audio-visual media can enhance learning in class X activity Skills Program Light Vehicle Engineering SMK Negeri 1 MondokanSragen TP 2011/2012. It is based on data and research findings in the field in the form of written data derived from observations and dialogue. The application of this learning model to increase student activity, the initial conditions of 22%, in the first cycle increased to 63% and on the second cycle increased to 78%. Assessment is based on aspects of student activity 4 things are, spirit, partnership, argued and asked, (2) use of audio-visual media learning can improve learning outcomes motor cooling system in class X Light Vehicle Technical Skills Program SMK Negeri 1 Mondokan TP 2011/2012 . From the empirical data demonstrates the use of audio-visual media to improve student learning outcomes. At baseline the minimum 30, maximum 90, and the average value of 60 with 53% mastery class. In the first cycle 35 minimum value, maximum value of 92 and an average value of 68,3 with 66% mastery class. In the second cycle 50 minimum value, maximum value of 98 and an average value of 77,3 with 81% mastery class . Keywords: audio visual media, cooling system, active, learning outcome

Perancangan Buku Panduan Wisata Kuliner Kota Surakarta

Kota Surakarta merupakan merupakan kota yang kaya akan tempat wisata khususnya wisata kulinernya. Kurangnya wawasan dan pengetahuan wisatawan mengenai kuliner kota Surakarta mendorong dibuatnya buku panduan wisata kuliner kota Surakarta ini. Buku ini dibuat dengan tujuan untuk memberikan informasi dan membantu wisatawan yang datang ke kota Surakarta untuk mencari dan menemukan kuliner khas kota Surakarta dengan lebih mudah. Selain itu, dengan buku ini juga diharapkan mampu memperkenalkan kuliner khas kota Surakarta ke daerah luar kota Surakarta

PENGARUH VARIASI TEMPERATUR DAN HOLDING TIME DENGAN MEDIA QUENCHING OLI MESRAN SAE 40 TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA ASSAB 760

The purpose of this study was (1) Determine the influence of temperature variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760, (2) Knowing the effect of holding time variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760, (3) Knowing the interaction of temperature variation and holding time variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760. This research uses experimental methods. Objects in this study is ASSAB 760 medium carbon steel, the product of the Associated Swedish Steels AB (Assab Steels) Stockholm, Sweden, with the chemical content of 0.50% C, 0.60% Mn, 0.30% Si and 0.04 S %. Data analysis techniques in this study using descriptive data analysis results graphically illustrate the tables, histograms, graphics, and images of microstructures. As an input parameter in analyzing the data include: temperature variation (800 °C, 840 °C, and 880 °C), holding time variation(15 minutes, 25 minutes, and 35 minutes), microstructure, and hardness. The results showed a change in the level of hardness and the microstructure formed. From the hardness test results obtained the highest level of hardness in the specimen temperature 800 °C with holding time of 35 minutes 27.66 HRC consecutive lows towards the specimen temperature of 840 °C with holding time 35 min and temperature of specimens 880 °C with holding time of 35 minutes 24.33 HRC, 840 °C specimen temperature and holding time 25 minutes at 24 HRC, the specimen temperature of 880 °C with holding time of 25 minutes 23.33 HRC, specimen temperature of 840 °C with holding time of 15 minutes 22.33 HRC, the specimen temperature 800 °C with holding time 25 minutes at 22 HRC, the specimen temperature of 880 °C with holding time of 15 minutes 21.33 HRC, specimen temperature of 800 °C with holding time of 15 minutes 19.33 HRC, and the lowest rate is specimens of raw material 8 HRC . Microstructure test shows microstructure of raw materials consists of ferrite and pearlite with impartial large crystals form and in accordance with the carbon content of 0.50 % and in the group of the hardening specimens with quenching media Mesran SAE 40 oil, new microstructure is obtained martensite is the main structure in increasing steel hardness . From the research it can be concluded that the variation of temperature and holding time variation with quenching media Mesran SAE 40 oil can change the microstructure and increases hardness of steel ASSAB 760 with the highest hardness value of the specimen temperature of 800 °C with holding time of 35 minutes 27.66 HRC. Keywords: temperature variation, holding time variation, microstructure, hardnes

PENGARUH SUDUT PENYAYATAN DAN JUMLAH MATA SAYAT ENDMILL CUTTER TERHADAP TINGKAT KEKASARAN PERMUKAAN BAJA ST 40 HASIL PEMESINAN CNC MILLING TOSURO KONTROL GSK 983 Ma-H

The purpose of this study is to determine: (1) the effect of endmill cutter primary angel to the roughness level of steel ST 40 machining result by Tosuro CNC Milling controlled by GSK 983 Ma-H. (2) The effect of the endmill cutter flute amount to the roughness level of steel ST 40 machining result by Tosuro CNC Milling controlled by GSK 983 Ma-H. (3) a combination of primary angel and the flute amount of endmill cutter which produces the smallest level of roughness. This study is an experiment that uses two-factor variables (angle incision and the number of eyes slice endmill cutter) and one dependent variable (the level of surface roughness). This study was conducted at the Machining Practices Laboratory of SMK Warga Surakarta for the formation of Test Objects and implementation of the machining process using Tosuro CNC Milling controlled by GSK Ma-H. The level of the surface roughness conducted at Engineering Materials Laboratory of Mechanical Engineering Diploma, The Faculty of Engineering, GadjahMada University. The research method used in this study is an experimental method with analytic descriptive analytical techniques. The results showed that there was primary angel and the flute amount of endmill cutter effect to the roughness level of steel ST 40 machining result by Tosuro CNC Milling controlled by GSK 983 Ma-H. The smallest combination of primary angel and the flute amount of endmill cutter toward the roughness level of steel ST 40 machining results process by TS 218 CNC Milling is on the interaction between primary angel of 5° and 4 flutes of endmill cutter is equal to 0,2013 µm and the greatest of the roughness level of steel ST 40 machining results process by TS 218 CNC Milling is on the interaction between primary angel of 10° and 2 flutes of endmill cutter is equal to 0,4691 µm. The more the amount of endmill cutter the smaller the level of the roughness

PENGARUH VARIASI MEDIA PENDINGIN TERHADAP KEKERASAN DAN STRUKTUR MIKRO HASIL REMELTING Al-Si BERBASIS LIMBAH PISTON BEKAS DENGAN PERLAKUAN DEGASSING

The purpose of this study was (1) Determine the effect of the variation media cooling to hardness remelting of Al-Si based used piston waste with degassing treatment, (2) Determine the effect of the variation cooling media to micro structure remelting of Al-Si based used piston waste with degassing treatment, (3) Determine the effect of the optimal cooling media results hardness and micro structure remelting of Al-Si based used piston waste with degassing treatment.This study used an experimental method that uses a single independent variable factor (media cooling variation) and two-factor variable (hardness and microstructure). Objects in this study using the results of remelting of Al-Si piston former waste. Data analysis techniques in this study using descriptive data analysis results graphically illustrate the tables and histograms as well as images of micro structures. Input parameters in analyzing the data include: variations in the cooling medium (water well, oil SAE 40 and salt liquid), micro structure, and hardness.The results showed a change in the level of hardness and the micro structure formed. From the hardness test results obtained the highest level of hardness in the media cooling well water 86.83 BHN respectively towards the lows of the cooling medium salt liquid at 83.63 BHN, media SAE 40 oil cooler for 63.24 BHN, and the non-quenching at low 54.22 BHN. Microstructure test shows the micro structure consists of the formation of Al that is soft (low hardness) and Si as an addition to the level of hardness that affect resilience, the size of the grains of different suggesting that different levels of hardness coupled. So we get the greater amount Si then the resulting hardness will increase. Keywords: media cooling variation, Al-Si, hardness, micro structur