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All Journal IJOCE (International Journal of Offshore and Coastal Engineering)
Pratikno, Herman
Institut Teknologi Sepuluh Nopember
Engineering

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The Effect of Addition of Mangrove Avicennia Marina Extract on The Biofouling Activity to Epoxy Coating Aisyah, Dwi Maharani; Pratikno, Herman; Titah, Harmin Sulistiyaning
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 2 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.15609

Abstract

Biofouling is one of the problems related to construction maintenance in industrial developments in the maritime construction sector because biofouling adhesion can affect construction productivity. This problem can be overcome by coating using natural-based paints to reduce the ecological impact that will occur. This study aims to determine the effect of the addition of Avicennia marina mangrove extract as an anti-fouling compound mixed with epoxy paint. This research was conducted by mixing Avicennia marina mangrove extract with epoxy paint. Then the alloy is applied as a coating on the ASTM A36 steel specimen. Furthermore, the test was carried out by immersing the specimen in a solution containing Littorina littorea as a biofouling biota. The average results of the biofouling affixing activity test with the addition of mangrove extract concentrations of 0%, 10%, 20%, and 30% were respectively 24.0 gr, 20.5 gr, 13.5 gr, and 6 gr. This test shows that the more the addition of mangrove extracts, the smaller the adhering activity of biofouling to the specimen.
Effect Analysis of Post Heating Temperature Variation on Metallography and Bending Test of GMAW ASTM A53 Steel Weld Joint Pratikno, Herman; Jafa, Muhammad Rizqy; Ikhwani, Hasan
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14553

Abstract

ASTM A53 steel is medium carbon steel with 0.3% carbon content and is often used for pipe manufacturing. The purpose of this study was to determine the effect of post heating temperature variation on bending and metallography test on weld joint of ASTM A53 steel using the GMAW process. The electrode used is ER-70S-6. Post heating temperature variations are 250oC, 300oC and 350oC. The bending test result showed that welding with 350oC postheating temperature produce the smallest open defect value. The microstructure result showed that welding with 350oC post heating temperature produce the smallest pearlite percentage in three areas observed.
Effect of Preheating Process and V Groove Type on the Tensile and Metallography Test of ASTM A53 with A36 Weld Joint Using FCAW Method Pratikno, Herman; Baredwan, Abdullah Husin; Dhanista, Wimala Lalitya
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 2 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.14769

Abstract

Steel is a metal material that is often used in the maritime industry due to its availability and weldability. ASTM A53 steel is a low carbon steel commonly used for piping applications. ASTM A36 steel is a low carbon steel commonly used for offshore buildings. This study aims to determine the influence of preheat temperature and V groove type on bend resistance of A53 and A36 weld joint using FCAW (Flux Cored Arc Welding) method. The preheat temperature used are 100°C and 150°C with groove type variations used were single V groove and double V groove. The type of protective gas used is 100% CO2. The results of tensile strength test showed that in the welding process in this study, specimen with preheat temperature of 150°C and double V-Groove shape has the strongest tensile strength, with HAZ width of 3.91 mm, ferrite phase percentage of 58.08%, and pearlite phase percentage of 41.92%.
Comparative Analysis of GTAW, GMAW, and FCAW Welding Results on A36 Steel Against Tensile Test and Macrostructure Pratikno, Herman; Abiyyuda, Hafizh; Dhanista, Wimala Lalitya
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14555

Abstract

Offshore building construction is inseparable from the fabrication process. Fabrication process that has an important role in terms of engineering, material repair and welding process. In offshore building construction, a precise welding method is needed on A36, where A36 steel is one of the main materials in the fabrication process of offshore buildings. In this study a comparison of welding results of GTAW, GMAW, and FCAW on A36 steel against Tensile Test and Macrostructure Test. The results of this research show that the best tensile test results are the GTAW welding method with an average value of ultimate strength of 462,168 MPa. Macrostructure testing which has the widest HAZ width is the GTAW welding method of 18,71 mm.
Co-Authors Abiyyuda, Hafizh Aisyah, Dwi Maharani Baredwan, Abdullah Husin Dhanista, Wimala Lalitya Ikhwani, Hasan Jafa, Muhammad Rizqy Titah, Harmin Sulistiyaning