Jurnal Konversi Energi dan Manufaktur UNJ
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PERHITUNGAN BEBAN KERJA OPERATOR LINI PERAKITAN KOMPRESOR TIPE SVC93E20PBE UNIT REFRIGERATOR R600A DI PT. PANASONIC MANUFACTURING INDONESIA: Optimizing Operator Workload for SVC93E20PBE Compressor Type Assembly Line in Refrigerator Unit R600A at PT. Panasonic Manufacturing Indonesia
Full text linkPanasonic Manufacturing Indonesia produces electronic equipment especially for the needs of ordinary consumers, business and industry such as refrigerators, ACs, water pumps, fans, washing machines and audio with problems with refrigerator and AC production units. The research was carried out on the SVC93E20PBE type compressor assembly line for the R600A refrigerator unit with the problem of operator workload being too high, above 100%. The research was conducted for 30 days on three compressor assembly line operators using the workload analysis method, with the aim of obtaining the productive percentage and workload level of operators on the SVC93E20PBE type compressor assembly line for the R600A refrigerator unit. Data was taken following a standard work sampling observation sheet, containing employee activities while working or unemployed with adjustments. The results of workload measurement using the workload analysis method showed that operator 1's workload was 133.63%, operator 2's workload was 133.62%, and operator 3's workload was 133.74%. Based on the description of the workload results for compressor assembly operators for the SVC93E20PBE type 600A refrigerator unit, the researcher proposes the addition of two operators to the compressor assembly line, a total of five operators with a workload for each operator of 80.198%
PENGARUH VARIASI KUAT ARUS SMAW TERHADAP SIFAT MEKANIK BAJA AISI 1045: SMAW Current Variations Effect on Mechanical Properties of AISI 1045 Steel
Full text linkThis study discusses the effect of variations in the parameters of the welding process on the tensile strength and Vickers hardness tests. In general, it is widely known that in the fabrication process, welding is a very important process that is used to join two or more materials. The welding process is carried out with variations in the strength of the welding current, namely 75, 85, and 95 A. The experimental method used in this research is AISI 1045 steel material with a thickness of 6.0 mm. The results of the tensile strength test have the highest value at a current strength of 75 A which is equal to 756.642 MPa. The lowest tensile strength test results were obtained with a tensile strength of 687.608 MPa at a current strength of 95 A. specimens with variations in current strength of 95 A have the highest value in the Vickers hardness test, with a hardness value of 281.25 HV. From the research conducted it is known that as the welding current increases there is a decrease in the value of the tensile strength. The hardness value in the heat affected zone (HAZ) area of all test specimens has the highest value, while the hardness value of weld metal (WM) and base metal (BM) has almost the same hardness value
PERILAKU DISTORSI, KEKERASAN DAN KOROSI HASIL HARDFACING PADA PERMUKAAN BAJA KARBON MENGGUNAKAN ELEKTRODA HV-800 DENGAN BERBAGAI KETEBALAN: Distortion, Hardness and Corrosion Behavior of Carbon Steel Hardfacing using HV-800 Electrodes with Various Thicknesses
Full text linkThis research aims to look at the hardness and corrosion of the weld layer. In addition, distortions were also observed in the post-welding specimens. Weld layers were made with variations of one, two and three layers of welding using HV-800 electrodes. The first step in this research is a literature study, followed by preparing tools and materials, heating electrodes, welding process, observing distortion, cutting specimens for testing followed by hardness and corrosion testing, and data analysis and conclusions. From the results of observing the distortion, it can be seen that the thicker the weld layer, the greater the distortion that will occur. Distortions in specimens welded with one, two and three layers are 1.5, 4 and 6° respectively. Furthermore, based on the results of the hardness test, it can be seen that the thicker the weld layer, the greater the hardness. The hardness of the one, two and three layer welded specimens was 550.2, 632.82 and 650.68 HV respectively. Then, based on the weighing results, it can be seen that the longer the immersion time, the greater the reduction in mass during 120 hours of immersing. Finally, from the results of the corrosion rate calculation it can be seen that the thicker the weld layer, the lower the corrosion rate that will occur. The corrosion rates for specimens welded with one, two and three layers were 13.23, 11.02 and 10.29 mpy, respectively. All three specimens have good corrosion resistance because they fall into the "good" criteria
PEMBUATAN PADUAN INTERMETALIK Mg2Si DENGAN DOPING BISMUTH SEBAGAI MATERIAL TERMOELEKTRIK: Synthesis of Bismuth Doped Mg2Si Intermetallic Alloy as a Thermoelectric Material
Full text linkIncreasing efficiency in gasoline fuel consumption in motorized vehicles is currently continuing. One way this is done is by making use of the energy that is lost during the combustion of a motorcycle engine. About half of the energy produced during burning will be lost due to heat energy and exhaust gases. This waste heat can be utilized by converting it into another form of energy. Thermoelectric materials are those that can convert heat energy into electricity directly. Thus, in this work, we synthesized the bismuth-doped Mg2Si thermoelectric material using a solid-state reaction method using a powder in a sealed tube technique. The initial step in the production process involves measuring the raw materials bismuth, silicon, and magnesium using the Mg2Si1-xBix formula (x = 0.00, 0.025, and 0.045). The raw material powder is grinded in a shaker mill before being sealed in a stainless steel tube. The powder is sealed in a tube and heated to 800 °C for 6 hours. According to XRD test results, the Mg2Si phase and Si and MgO phases have formed. The lattice constant of the cubic Mg2Si phase was found at ~0.636 nm. A SEM investigations of surface morphology suggest that bi-doping on Si sites influences grain size refinement. Therefore, it can be concluded that the Mg2Si intermetallic alloy production process was successfully completed
ANALISIS KECEPATAN KELUARAN ANGIN KONDENSOR AC TERHADAP JENIS–JENIS BLADE GENERATOR LISTRIK DENGAN KOMPUTASI FLUIDA DINAMIK: Analysis of AC Condensor Wind Output Speed to Types of Electric Blade Generator with Computational Fluid Dynamics
Full text linkElectrical energy is widely used for household and industrial purposes, so the need for electrical energy will continue to increase every year. Therefore, it is necessary to develop an electrical energy generation system that comes from renewable energy such as wind. Currently, not much is known about the use of wasted wind from air conditioner (AC) condensers. The blow of wind can be used to produce electrical energy, so it is necessary to make wind-powered electric generator blades from the condenser output. The blade that will be designed is a three-blade model, so it is hoped that it can rotate the generator optimally. The purpose of this research is to design a three-blade type that can optimize the rotation of the electric motor/generator and get the maximum number of revolutions with a three-blade design because this design provides better stability and more efficiency. One way of making the design is to make simulation variations with computational fluid dynamics (CFD) in order to find out the right blade design to rotate the generator and find out the wind blowing from the air conditioner (AC) condenser that crosses the blade. In this study, three simulations were carried out to get maximum results, namely 390 rpm at 42 °C with a velocity of 10.7 m/s and a pressure of 34.4 Pa. To be able to determine the effectiveness of the AC condenser wind output speed with a three-blade design
PENGARUH TITANIUM DALAM LAPISAN LAS TERHADAP STRUKTUR MAKRO-MIKRO, KEKERASAN, DAN LAJU KOROSI: Titanium Effect in Weld Layer on The Macro-microstructure, Hardness, and Corrosion Rate
Full text linkLow carbon steel cannot be hardened because of its low carbon content. Therefore, a hardfacing process is carried out to increase hardness. Apart from increasing hardness, the benefits of hardfacing can increase wear and corrosion resistance. The hardfacing process using the shielded metal arc welding (SMAW) process generally uses commercial electrodes. Therefore, it is necessary to add other elements such as titanium (Ti) to the weld layer to further increase its hardness. This research aims to study the influences of Titanium (Ti) addition in welding layers that were welded using HV 600 to micro and macrostructure, hardness, and corrosion rate. The hardfacing was conducted using the SMAW process with the various addition of Ti (0.115, 0.223, and 0.334 g) and cooled at room temperature. Macrostructure and microstructure were investigated using digital cameras and an optical microscope. Hardness and corrosion rate were investigated using the Vickers hardness test and weigh loss method. Based on macrostructure investigation, there is a perfect fusion between base metal and weld metal. The microstructure formed is a austenite, martensite and carbide phase. The lowest corrosion rate of 17.54 mpy was seen in the Ti1 sample. The lowest Ti addition would resulting higher hardness at 761.06 VHN
SIMULASI ALIRAN FLUIDA PADA INSTALASI GASIFIKASI TIPE DOWNDRAFT: Fluid Flow Simulation in Downdraft Type Gasification Installation
Full text linkThe development of energy is very important to maintain oil reserves and also substitute for fossil fuels. Agricultural waste can be used as an alternative raw material to assist in the depletion of petroleum reserves and increase the use value of agricultural waste. Gasification is a process that converts energy into syngas that can be used for fuel. Fluid flow simulation research in the downdraft was conducted to determine the effect of the heat distribution or temperature on the gasification equipment installation and the effect of the cooling water mass flow rate on the airflow out of the reactor. Numerical study method using computational fluid dynamic solidworks flow simulation software. The fixed variables in the simulation are inlet air velocity 1.27, 1.36, and 1.49 m/s where this figure is obtained from an experiment to test the characterization of the downdraft actual the simulation in the reactor shows the temperature of the combustion reactor is 800-850ºC to be 400-450ºC at the reactor output. The simulation on the heat exchanger is carried out to reduce the air temperature to the temperature operating engine. The heat exchanger uses water fluid with a mass flow rate of 0.05 kg/s. The best simulation is obtained at the variation of air velocity 1.27 m/s and temperature reactor 900ºC where the output temperature is 92.11ºC. Doing a new experiment on gasification, then doing a simulation first, will make the gasification work easier
DESAIN RAK TEMPAT PENYIMPANAN TABUNG GAS ARGON DENGAN KAPASITAS MAKSIMUM 3 TON: Design of the Argon Gas Storage Rack with a Maximum Load Capacity of 3 Tons
Full text linkGas tungsten arc welding (GTAW) uses argon gas as a protective gas in the welding process. Argon gas cylinders weigh 100 kg, making it difficult to mobilize in large quantities when the welding work is at a certain height. Therefore it is necessary to create a storage area that is able to accommodate and withstand the load of gas cylinders and their contents and can be mobilized at a certain height. In order to get a suitable storage area, a design has been carried out, which includes calculating the strength of the frame, determining the material and design of the lifting lug, and calculating the welding connection of the lifting lug and hollow steel. The rack material used is SS400 type, the compressive stress that occurs due to the force acting on the hollow iron is 91.124 MPa and the stress received by the base plate is 127.5 MPa, while the allowable compressive stress for the material is 152 MPa. The load received by the lifting lug is 33,866.6 N, and the tensile stress due to the force acting on the lifting lug is 76.88 MPa, while the allowable tensile stress is 152 MPa, so the lifting lug is declared safe to use.
 
INOVASI DESAIN KUNCI PAS MENGGUNAKAN CATIA V5R20 DENGAN PENDEKATAN ANTROPOMETRI (STUDI KASUS PADA PT. KARYA BAHANA UNIGAM DIVISI PEMELIHARAAN MESIN): Design Innovation of Wrench using Catia V5R20 with Anthropometric Approach (Case Study on PT. Karya Bahana Unigam Machinery Maintenance Division)
Full text linkSince the occurrence of the Covid-19 pandemic in early 2020 in Indonesia, it has been necessary to maintain the body's immunity so that it remains stable so that the body is not easily exposed to the virus. For that, PT Karya Bahana Unigam needs to do something that can facilitate the maintenance of press machines by innovating on wrenches as a tool to simplify the machine maintenance process. The innovation that was carried out on this spanner started with distributing questionnaires to machine maintenance operators at PT Karya Bahana Unigam with the aim of knowing the needs of users and knowing the technical characteristics of these innovative products. After making the House of Quality (HOQ), anthropometric calculations are carried out to determine the dimensions of the Wrench innovation product to be made. The results of anthropometric calculations show that the spanner product length is 32.2 cm, the spanner innovation product width is 5 cm, and the spanner product width is 1.34 cm. The design was made using CATIA V5R20 software with a 3-dimensional design form, and drafting was also carried out to find out the design from various views. The folding wrench design consists of 3 components, namely a size 17 spanner, a size 13 spanner, and a pin as a key hinge
PERHITUNGAN WAKTU BAKU DAN PENENTUAN PRODUKTIVITAS PADA PENGERJAAN PEMBERSIHAN KACA GEDUNG X: Standard Time Calculation and Determination of Productivity for Glass Cleaning Works of Building X
Full text linkXYZ is a company that provides building maintenance services; one of its services is glass cleaning services. In every work on building maintenance services projects in the form of cleaning the glass of PT. XYZ has not calculated the standard time of work, which affects 45% of the total work exceeding the deadline for the job given and the difficulty of estimating the productivity of the workers. In this study, the standard time and productivity were determined on the glass cleaning work of building X using the stopwatch time study method. The results of the calculations carried out using the stopwatch time study method obtained the optimal normal time at each stage of the work, namely in the preparation of work equipment for 58.55 minutes, on the removal of the gallows 112.82 minutes, on the installation of ropes of 20.41 minutes, on machine checking is 22.29 minutes, glass cleaning is 54.17 minutes, rope disassembly process is 57 minutes, and gondola storage is 55.33 minutes so that the optimal standard time is 380.56 minutes. Calculation results showed that performance rating measurement, excellent skill is B1 +0.11, a good effort is C1 +0.05, good condition is C +0.02, consistency is C +0.01 with a rating factor obtained in normal time is 65.569 minutes, and from the results of the calculation of worker productivity in the work of cleaning the glass of building X was obtained 0.12 units/hour