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Pengaruh Variasi Colling pada Pengelasan GMAW Terhadap Uji Tarik dan Uji Kekerasan pada Baja ST 60 Warso; Trio Nur Wibowo; Yuliyanti Dian Pratiwi
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i1.578

Abstract

The technology of the manufacturing industry is developing rapidly, where the rapid development of this technology cannot be separated from the welding field. In the welding process, thermal heat is used until the material melts, the heat change will also cause changes in the structure, stress and also deformation of the material. This is because the more carbon elements are captured, the more martyred structures are formed. This causes an increase in the value of hardness and tensile strength values in the material. The purpose of this study was to determine the effect of the temperature of the cooling medium oil, salt water, water. dromus, and free air in GMAW welding on the tensile test of ST 60 steel. To determine the effect of cooling temperature medium of Oil, Salt Water, Dromus Water, and Free Air on GMAW welding toward the tensile test and hardness test of ST 60 steel. Several means used for testing are calculating the tensile stress Mpa and HVN hardness. This research method used the experimental method. The GMAW welding process variations of coolant were used, such as oil, salt water, dromus water, and free air with a time of 25 minutes and electic current of 100 A. The type of seam used was a V type with angle of 30o. The tests carried out were tensile and hardness test. The highest average value of the tensile stress from the the salt water coolant specimen was 490.23 Mpa. The highest average value of the tensile strain from free air specimens was 35.45 Mpa. The average value of HVN hardness from Oil specimens was 208.3 HVN, salt water was 231.0 HVN, Dromus water was 215.5 HVN, and free air was 228.0 HVN. From the average value of HVN hardness, the highest value observed was the salt water specimen with 231.0 HVN.
Studi Eksperimental Unjuk Kerja Motor Diesel Putaran Stasioner dengan Campuran Bahan Bakar Biodiesel Buah Nyamplung Yuliyanti Dian Pratiwi; Sutarno; Warso
Accurate: Journal of Mechanical Engineering and Science Vol. 2 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/accurate.v2i1.582

Abstract

The recent development of technology and the continuous development of human lifestyle have resulted in the increasing of the need for energy, so that the availability of energy from non-renewable fossil fuels is decreasing, and it is even predicted that it will run out over time. One of the most prospective vegetable oil resources to be used as a raw material for biodiesel is product from the processing of nyamplung seeds (Calophyllum Inophyllum L). Due to nyamplung seed oil is not included in the category of primary food needs, so its usage as a biodiesel will not interfere with human food needs. The purpose of this research is to find out how much torque and sfc power to the mixture of biodiesel fuel from nyamplung fruit. This research used experimental studies with research that has been done to produce Power, Torque, and Sfc from a mixture of 20% of 1.72kW, 10,955Nm and the value of increase down 10.08%. Percentage of 30% 1,692kW, 10,777N.m and the value increase / decrease -1.09%. The percentage of 40% 1,719kW, 10,949N.m and the rate is up / down 5.77% for Dexlite. Percentage of 20% 1,722kW, 10,968N.m and 4.63% increase / decrease value. Percentage of 30% 1,710kW, 10,891N.m and value increase / decrease 6.52%. The percentage of 40% 1,722kW, 10,968N.m and the increased value by 5.95% for Pertamina DEX.