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Graciadiana I Huka
Jurusan Teknik Mesin, Politeknik Negeri Ambon
Industrial & Manufacturing Engineering Mechanical Engineering

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ANALISIS PENGARUH VARIASI ARUS PENGELASAN TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO PADA SAMBUNGAN LAS SMAW DAN FCAW DENGAN MATERIAL BAJA KARBON RENDAH Jovancko. S. S. Picanussa; Nevada. JM Nanulaitta; Graciadiana I Huka
Journal Mechanical Engineering Vol. 2 No. 3 (2024): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i3.2889

Abstract

Carbon steel is a type of alloy steel consisting of various elements, especially iron (Fe) and carbon (C). In general, the properties of steel are influenced by the percentage of carbon and the microstructure of the steel which is influenced by the composition of the steel and heat treatment. The welding process can change the structure and composition of the steel. In this study, the welding process used is SMAW and FCAW welding. Then the testing process is carried out, namely tensile testing and microstructure to see the effect of variations in the welding current used. In this study, the author will analyze the effect of variations in welding current on tensile strength or mechanical properties as well as the structure and composition of the specimen to be tested in this case medium carbon steel. The welding methods used are FCAW (Flux Core Arc Welding) and SMAW (Shield Metal Arc Welding). The results of this study, the author found that the welding current has an effect on the tensile strength and microstructure of medium carbon steel. Where for tensile strength, the greater the welding current used, the greater the tensile strength of the specimen where the current range used must be adjusted to the thickness of the workpiece used. In FCAW 90A the value obtained is 438.30 MPa and the strain value is 6.20% and SMAW 90A the value obtained is 438.20 MPa and the strain is 7.20%. Likewise, the Pmax and ΔL values where in SMAW 90 ampere the Pmax value is 43.82 KN and ΔL 3.60mm, FCAW 90 ampere the Pmax value is 43.83 KN and ΔL 3.10mm. With this, the author concludes that with a material thickness of 8mm and a current variation of 70 amperes and 90 amperes, it was found that at a larger welding current of 90 amperes, the tensile strength obtained was greater and for the microstructure, the author found changes in the structure of the welding results in FCAW welding where in the raw material the structure found was ferrite and pearlite while for the FCAW welding results, a beanite structure was found. Keywords: Welding, tensile strength, microstructure.
EVALUASI KINERJA CARGO OIL STRIPPING PUMP TYPE BORNEMANN TWIN SCREW 2HM4200-100 DI KAPAL MT. NONI T Yuliens Anggin Kayadoe; Roy R Lekatompessy; Graciadiana I Huka; Sanny Hahury
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2919

Abstract

Evaluation of the performance of cargo oil stripping pumps on the Mt. Noni T ship is needed for smooth loading and unloading of avtur at PT Pertamina Prata Niaga Integrated Wayame Ambon. Pumps that operate continuously will experience a decrease in work. This can be caused by several factors, namely the age of the pump, and the level of roughness of the pipe that causes an increase in head loss. The purpose of this study is to evaluate the performance of cargo oil stripping pumps on the MT. Noni T. The method carried out in the study uses a quantitative method with 2 variables. The independent variable is the input power and output power of the pump while the bound variable is the efficiency of the pump. The data obtained consisted of primary data and secondary data. The methods used when collecting data are interview, observation, and documentation methods. The result of this study is that there is a decrease in pump efficiency which was initially 100% to 80% influenced by the life of the pump and its operating time. Suggestions that can be given are Conducting periodic inspections of the pump to prevent damage that may occur in the future and Conducting inspections of the pump drive motor so that the pump works properly.Keywords: Screw, pump, efficiency, tanker, Flow.
ANALISA LAJU KOROSI PIPA SCH 40 SEAMLESS DENGAN VARIASI MEDIA PENGKOROSIAN AIR PAYAU DAN AIR LAUT Cindy Gabriel Maitimu; Leslie S. Loppies; Denny Ismail Pellu; Graciadiana I Huka
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Agustus
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2920

Abstract

Metals, especially steel, are widely used in various industrial applications due to their strength and durability. However, corrosion is a significant drawback that can shorten the life of the material. This research aims to analyze the corrosion rate of SCH 40 seamless pipes with a variety of corrosion media: brackish water, sea water, aquadess, NaCl solution, and oxygen, in conditions without paint coating and with paint coating. The research method uses the weight loss method according to the ASTM G102-89 standard, where the corrosion rate is measured in millimeters per year (mmpy) by calculating the difference in pipe weight before and after immersion. The results show that the corrosion rate without paint coating is: brackish water 0.00016 mmpy, sea water 0.00014 mmpy, aquadess 0.00016 mmpy, NaCl 0.00015 mmpy, and oxygen 0.0000045 mmpy. Seawater showed the lowest corrosion rate, possibly due to the formation of a passive protective layer. Oxygen had the lowest corrosion rate, indicating that oxygen alone does not cause significant corrosion without moisture. With paint coating, the pipe corrosion rate becomes: brackish water 0.00000125 mmpy, sea water 0.00000125 mmpy, aquadess 0.00000268 mmpy, NaCl 0.00000107 mmpy, and oxygen 0.00000125 mmpy. The use of paint coatings significantly reduces the rate of corrosion, especially in corrosive media such as brackish water, sea water and salt solutions. These results emphasize the importance of paint coatings to extend the service life of pipes by reducing the speed of corrosion. Key words: corrosion, seamless pipe, paint coating, corrosion media, corrosion rate, weight loss method
Co-Authors Cindy Gabriel Maitimu Denny Ismail Pellu Jovancko. S. S. Picanussa Leslie S. Loppies Nevada. JM Nanulaitta Roy R Lekatompessy Sanny Hahury Yuliens Anggin Kayadoe