Jurnal Mesin Nusantara

Comparison study of conventional underwater electrodes and electrodes with additional modification of mg

2023-08-21T11:30:42+07:00

The influence of water depth, microstructure, chemical composition, welding defects, and mechanical properties affect underwater welding. In addition, the determination of electrodes for underwater welding requires unique properties, including being able to cause arcing and slag to grow on the surface of metal deposits which can protect against the effects of oxides and low hydrogen solubility. The electrodes must meet the AWS D3.6M underwater welding specification standard. In this study, the steel plate material used in AH-36 and implemented for underwater wet welding by comparing two electrodes, namely E6013 with additional Mg modifications and Broco E70XX electrodes specifically for underwater wet welding, the other Mg on E6013 rutile electrodes with modification 1 ( 3% Mg) and Modification 2 (5% Mg). The welding method with a heat input of 1.5 kJ/mm with 130 A and 2.5 kJ/mm with 140 A is carried out at 5m. The radiographic test results showed that the welded specimens at a depth of 5m showed imperfect penetration defects. It may be due to the effect of significant pressure and higher cooling rate that the weld melt cannot penetrate completely into the parent material. The tensile test results also showed an insignificant increase in the strength of the underwater welding, and the elongation was quite significant. Occurs at the E6013 electrode with modification 1 (3% Mg) and Modification 2 (5% Mg). The increase is not too significant. Penetration is not perfect. Due to significant pressure and a higher cooling rate, the molten weld cannot penetrate completely into the parent material. However, for testing the Broco E70XX electrode where there is no change in microstructure, such as electrodes modified with magnesium where only grain growth occurs, and there is Spheroidite which makes the microstructure related to mechanical properties, namely ductile.

Perancangan Single Girder Gantry Crane 2 Ton di PT Spindo Unit VI

2023-11-06T00:08:02+07:00

In carrying out the design process, the main factor that must be considered is the lifting strength of the crane against the maximum load borne. Because the inaccuracy of the design process can result in malfunctions, even causing work accidents. Therefore, it is necessary to do the right design so that it can be used safely. In this design, the design of a lifting aircraft with a single girder gantry crane is designed with a lifting capacity of up to 2 tons, a lifting height of 4 meters, and a transfer width of 5 meters.. The design method used is by substituting the values and other factors needed into the known equations to obtain the final result. To determine the maximum tensile strength of the load in this crane design, the equation for the maximum tensile force is used to obtain a result of 633.12 kg. Then for the steel rope chosen in this design is the 222 wire construction with parallel positions. By using the equation for resistance of the motor to movement, the power needed to move the crane is also 23,215 HP

Mechanical Properties Of Welding API 5l X-65 Cladded UNS N08825 Material Due To The Effect of Welding Repair

2023-08-21T11:30:43+07:00

Abstract This study evaluate the mechanical characteristics and microstructure of API 5L X-65-clad UNS N08825 during repair welding. Gas tungsten arc welding (GTAW) and shielded metal arc welding were used in combination to carry out the welding and the repair welding (SMAW). Filler metals ER NiCrMo3 and E NiCrMo3 were used throughout the GTAW and SMAW welding processes. The first specimen served as the primary focus, after which the weld areas of the remaining four specimens were ground, re-beveled, and then re-welded using the same parameters. It performed tensile testing, bending tests, Impact Charpy tests, macro photography tests, and Vickers hardness tests. Repairs weld carried out, the heat-affected zone's hardness in the capping region increased. The findings of the tensile test demonstrate that the tensile strength is not considerably impacted by the welding repair at any particular welding repair location. The biggest decline in the number is caused by the welding repair at PTR 2, which is 0.83 percent. The heat affected area (FL) value decreased by 10.44 percent according to the charpy impact test results. The PTR 1 and PTR 2 areas in the weld metal area had the lowest charpy impact test results, respectively, of 88 J and 258 J.

Analisa Penggunaan Support Frame Lama Pada Desain Baru Screw Conveyor Machine Menggunakan Metode Elemen Hingga

2023-08-21T11:30:43+07:00

Frame construction is one of the things that must be considered in the process of designing a machine, for that the design of the strength of the frame is an important thing in order to withstand the load and support the various components contained in the machine and analyze the strength of the frame related to the capacity of the screw conveyor machine.This study aims to analyze the structural strength of the Support frame which is used to support the new design of the screw conveyor machine in the process of moving and draining wet plastic pieces. The method used in this design includes collecting data, creating a 3D model using solidwork software, then analyzing the structure using the Finite Element Analysis (FEA) simulation method. The results of the FEA simulation on the truss construction with a loading of 4,049 N get the highest stress value (stress) with the centralized loading method of while with the uniform loading method of , compared to the yield strength value of 250.000.000 the support fream construction is safe to use, the displacement (deflection) with the uniform loading method is 0.4 mm while the concentrated loading method is 0.77mm, The simulation results of factor of safety analysis from uniform loading are 10 while for the centralized loading method the factor of safety value is 4, so it is concluded that this design is feasible to use and the safety factor is good.

Analisis Kegagalan pada Bearing Block Clinker Cooler PT Semen Baturaja Pabrik 2 menggunakan Failure Mode and Effect Analysis Method (FMEA)

2023-08-21T11:30:44+07:00

The process of making cement goes through numerous phases and different procedures in order to produce cement that is up to factory requirements. In addition to the combustion process, the cooling process also exists in the cement manufacturing kiln area, particularly the rotary kiln, but it is less crucial. A crucial aspect of the cement production machinery is the cooling procedure or clinker cooler. The cooling process here impacts the quality of the cement produced, therefore this equipment is used to cool or lower the temperature of the clinker so it doesn't burn in the rotary kiln. The relationship between the clinker's crystal concentration and the liquid phase is influenced by the rate at which the clinker cools

Hydrotest Process on Tube Bundle Pertamina RU III Plaju Palembang at PT. PAL Indonesia

2023-11-06T00:07:41+07:00

A tube bundle (shell and tube heat exchanger type) is a tool to transfer heat from a fluid system that usually functions as a cooler or heater. So, to find out if the tool can function properly it is necessary to hold a test, one of which is a hydrotest. Hydrotest is a test method to measure the strength and detect leaks in piping systems. This test is very important to do to ensure there are no leaks in the tube bundle. The test method uses water as a fluid medium which is filled into the tube bundle and is pressured by a hydrostatic test pump at not less than 1.5 times the nominal pressure. In this test, the tube bundle being tested has a nominal pressure of 183.95, so it must be tested with a pressure of 367.91 PSIG. After checking, there was no pressure drop from the hydrostatic test pump. The graph on the pressure recorder is as desired so that this test is declared to have passed. The tube bundle that is declared to have passed the hydrotest will then proceed to the final check stage by the QA officer. When doing a hydrotest, it must be done carefully because if you experience overpressure it can cause fatality in the tube bundle and damage to facilities.

The Effect of Continuous Variable Transmission Spring Variation on 110 CC 4 Stroke Fuel Motor

2023-08-21T11:30:45+07:00

Dalam penelitian ini yang dilakukan terhadap sepeda motor khususnya sepeda motor bertransmisi otomatis (matic). Berdasarkan hasil observasi yang dilakukan kepada pengguna sepeda motor bertransmisi otomatis (matic) terdapat keluhan yang dirasakan pengguna, hal yang sering dikeluhkan yaitu performa motor yang kurang responsife. Ada beberapa cara untuk meningkatkan performa sepeda motor maic salah satunya mengganti spring pada continuous variable transmission (CVT). Pengujian dilakukan pada sepeda motor Honda Beat FI 110 cc tahun 2013. Tujuan pengujian untuk mengetahui seberapa besar pengaruh spring cvt terhadap daya, torsi, dan konsumsi bahan bakar yang dihasilkan pada sepeda motor dengan variasi spring racing 6100 – 6300 rpm. Metode yang digunakan dalam penelitian ini adalah metode penelitian eksperimen, yaitu sebuah penelitian yang berusaha mencari pengaruh variabel tertentu terhadap variable lain dalam kondisi yang terkontrol. Dari hasil penelitian didapatkan hasil daya terbesar pada spring racing sebesar 7,1 hp pada putaran meisn 6300 rpm, sedangkan torsi terbesar yang dihasilkan terdapat pada putaran mesin 6300 rpm sebesar 8,1 N.m dengan penggunaan spring racing. Pada kosumsi bahan bakar minimal yang dihasilkan sebesar 0,233 Kg/jam.hp pada putaran mesin 6100 rpm dengan menggunakan spring racing.

Rancang Bangun dan Model Kinetika Pengeringan Jamur Tiram pada Pengering Surya dengan Tiga Kolektor

2023-08-21T11:30:47+07:00

Oyster mushroom is a group of food plants that are rich in protein, vitamins and minerals. The weakness of this mushroom is its high moisture content so it rots quickly when stored in fresh conditions. Drying by using solar energy is one of the best options because of its sufficient quantity and low cost. This study proposes a solar dryer with three collectors of 500 mm x 500 mm x 1254 mm each with 4 rack. The drying experimental is using a sample of 1 kg. The best model of drying kinetics is the MMF model with an R value of 0.9950. The moisture extraction rate (MER) was 137 gr/hour under experimental conditions.

Analysis of Reducing Loss Time in The Stamping Process in The AIDA 800 T Blanking Machine at PT. XYZ

2023-08-21T11:30:48+07:00

In a production process optimization is needed to increase the productivity of production results. This research was conducted on the Aida 800T Blanking machine, based on the results of field observations made on the Aida 800T Blanking machine at PT. XYZ there is frequent losstime, this hinders the production process which results in reduced production targets. Losstime often occurs during a production process, the factors that often occur are the environment, humans, materials, and machines. The purpose of this study is to find out how much the cost is due to loss time. The methods used to perform losstime analysis are 5 why analysis, Pareto diagrams and fishbone diagrams to identify problems that often occur in the production process. From the results of the research, it was found that the costs incurred were Rp. 6,509,220. By performing a losstime analysis, there is a cost saving of 3,797,736 during one month of production, so that the method is successfully used with the end result of doing kaizen.

Analisis gaya dan daya pada alat pengaduk mesin kristalisasi jahe dengan kapasitas 5 kg/jam

2023-08-21T11:30:48+07:00

Red ginger is a plant that is easy to grow in Indonesia and is well known as a spice plant and can be found in many plantation farmers, such as in Kediri Regency, Kepung District, Besowo Village. One of the preparations of red ginger that local residents are involved in is making instant herbal medicine. The processing of instant herbal medicine with red ginger as raw material includes the process of washing, grating, squeezing, and cooking so that the final result is crystallized red ginger. The focus of discussion in this article is the mixing process. The design of this mixing machine uses a power of 0.5 HP and a rotation of 1400 rpm to mix 5 kg/hour of red ginger dough. This stirring process takes 60 to 80 minutes until red ginger crystals form.