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Mohamad Faizal

Program Studi Teknik Mesin Institut Sains Teknologi Nasional ISTN

Author-ID : 3824143

Electrical & Electronics Engineering Engineering

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ANALISIS KEKUATAN DAN KUALITAS SAMBUNGAN LAS DENGAN VARIASI PENDINGINAN OLI DAN UDARA PADA MATERIAL ASTM A36 DENGAN PENGUJIAN NDT (NON DESTRUCTIVE TEST) Mohamad Faizal; Syahrul Umam
Bina Teknika Vol 14, No 2 (2018): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

Welding is the process of joining two metals to the point of metal recrystallization using either added or not material and using heat energy as a melting agent. In this study, different cooling variations on each specimen were carried out, the material used was ASTM A36 Plate, 3.2 mm diameter E7018 electrode, cooling used with Oil and Air. in the implementation of welding using the SMAW (Shielded Metal Arc Welding) welding method. From the above understanding, research and testing are carried out including tensile tests, radiography / x-rays, and penetrants. The purpose of this study was to determine the strength and quality of welded joints that were not seen with the Destructive Test on the ASTM A36 plate and also to determine the effect of variations in oil and air cooling. From this study it can be found that the tensile strength values for specimen 1 (Oil ) is 373.06 MPa. While the value of tensile strength for specimen 2 (Air) is 365.31 MPa, this means that it has decreased by 7.75 MPa from the tensile strength of specimen 1 (Oil).

PENGARUH ARUS PENGELASAN PADA BAJA ASTM SA 516 Gr70 TERHADAP KEKUATAN TARIK DAN KETANGGUHAN LAS SMAW DENGAN ELEKTRODA E7018 Mohamad Faizal; Ali R Salam
Bina Teknika Vol 14, No 1 (2018): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

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. The determination of the magnitude of the current in metal grafting using arc welding affects the efficiency of the work and the weld material. Based on the existing problems, this research aims to determine the effect of low carbon steel welding current on tensile strength, toughness, hardness and micro structure to use SMAW with E7018 electrode using experimental research methodology using low alloy steel ASTM SA 516 gr 70 containing chemical element C = 0.16%, Si = 0.37%, Mn = 0.146%, S = 0.11%, Ni = 1%, Nb = 1%, Cr = 2%, Cu = 0.47%. Material welded with a variation of welding current 110 A, 130 A and 150 A using reverse polarity DC SMAW with E7018 electrode diameter of 3.2 mm. Specimens were tested for tensile strength, toughness, hardness and microstructure photographs with the highest tensile strength results in a variation of 130 A currents with an average of 546.83 MPa which increased by 21.77 MPa from raw materials. The highest yield strength at 130 A current variation with an average of 377.27 MPa which increased by 17.27 MPa from raw materials. The toughness in the highest welding area occurs in the 110 A current variation of an average of 1.85 Joule / mm2, it decreases 0.375% of the raw materials. The highest level of hardness occurs in the weld metal area with an average of 201.5 HVN of current variation of 150 A, this show in the micro structure of the grains are softer than the variations of other welding currents.

ANALISA PENGARUH SUHU DAN WAKTU PEMANASAN PADA NYLON FILM TERHADAP MAMPU BENTUK ZIPPER Mohamad Faizal; Fahmi Wahyudi
Bina Teknika Vol 13, No 1 (2017): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

Ultrasonic Welding has been used to join the thermoplastic material of about 35 years. Now, Ultrasonic Welding has been widely used not only for the thermoplastic material, but also can be used for all kinds of industries, one of which is the textile industry. Ultrasonic Welding has many advantages economically and efficiency. In its use of the zipper industry, Ultrasonic Welding used to join between components to the surface of the film nylon zipper. However, the wrong calculation of the temperature and the length of time could caused the strength of nylon films was reduced to cause permanent damage. This study aims to determine the temperature and duration of heating time. Ultrasonic Welding is used Branson type with power supply 40 kHz / 60 W with a maximum current of 3A. Booster type used is standard series M8 x 1:25 Horn 40 kHz with titanium material. Converter used CH30 with a maximum continuous use at 60 W. attachment method used is butt joint with a gap between the horn surface is ¼ inch zipper.Thermoplastic material in this case used nylon 66.

ANALISIS PENGARUH PENURUNAN TEMPERATUR PADA PROSES TUANG CAIRAN LOGAM DENGAN COVER LADLE DI PT. X Mohamad Faizal; Hendra Gunawan
Bina Teknika Vol 15, No 1 (2019): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

Block Cylinder is an important component of a vehicle engine where the quality of the component should not be defect because it can affect the function of the vehicle engine. Block cylinder is made from cast iron material (FC 230) which must be melted with temperature >1400 ° C. The temperature of cast iron molten metal into the mold is a very important factor to guarantee final quality of block cylinder. Process pouring of molten metal into a mold using a ladle to pouring 15 molds. Pin hole defects often occur in the final castings, this is due to molten metal temperature drop at the end, the one factor is air convection suction smoke collector. Smoke collector is required to move the gas that arises during the pouring process to outside the factory in order to make a comfortable and healthy work process, but it has side effect speed up decreasing temperature of molten metal. To solve the decrease temperature is minimize the rate of heat transfer that occurs from molten metal to environmental air. One way is to close the ladle with the cover to reduce the heat transfer that occurs in the metal liquid. The material used as a ladle cover is Kaowooltm SZr, where it has low thermal conductivity and light density. The rate of heat transfer occurring in the metal liquid to the surrounding air without cover is 4,5563 kW. After using the ladle cover the rate of heat transfer from metal liquid to air decreases to 1.8287 kW. Then the liquid temperature of the final cast metal rises from 1369 ° C to 1383 ° C, and the pin hole defect occurring in the final cast decreases from 0.22% to 0.12%.

Co-Authors Ali R Salam Fahmi Wahyudi Hendra Gunawan Syahrul Umam

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