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p-Index From 2021 - 2026
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This Author published in this journals
All Journal International Journal of Marine Engineering Innovation and Research
Ali Azhar
Lecturer of Faculty of Technik dan Marine Sciences, University of Hang Tuah, Surabaya, East Java, 60111, Indonesia
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Cooling Media Treatments of the Welding Result of Aluminium 5083 using Gas Tungsten Arc Welding (GTAW) on Material Strengths Bina Susila; Ali Azhar; Mark Jefferson; Achmad Syamsul H
International Journal of Marine Engineering Innovation and Research Vol. 11 No. 1 (2026)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v11i1

Abstract

Cooling treatment will occur in every welding process. In welding construction of Aluminium raw materials using the Gas Tungsten Arc Welding (GTAW), sometimes carried out in different locations and conditions. The study aims to determine and analyses the treatment effect of variations cooling media using air, fresh water, and sea water on the material strength (tensile strength, bending strength and hardness) welding results of aluminium 5083. This research method is experimental by testing specimens of welding results. Data analysis with independent variables of air, fresh water, and sea water cooling media. The dependent variables are tensile strength, bending strength, intervening variable of hardness and as a control variable, Aluminium 5083 the same size of 300x150x6mm. The test results with air media cooling treatment obtained data, the direct cooling treatment the tensile test value was 193Mpa, the bending test was 61Kgf/mm2, the hardness test 63HRB, the media cooling treatment was flowed at a speed of 2,8m/s, the tensile test value was 178Mpa, the bending test was 49Kgf/mm2, the hardness test 55HRB and the media cooling treatment was flowed at a speed of 4,2m/s, the tensile test value was 157Mpa, the bending test was 55Kgf/mm2, the hardness test 59HRB.
LPD Ship Construction Planning Strategy At A Large-Scale Shipyard In East Java Aris Supriyadi; Intan Baroroh; Ali Azhar; Akhmad Basuki Widodo
International Journal of Marine Engineering Innovation and Research Vol. 11 No. 3 (2026)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v11i3

Abstract

The construction of the Landing Platform Dock (LPD) 163 M ship in the Warship Division of PT. XXX Indonesia is a project with a high level of complexity that requires effective project schedule control to minimize work delays. This study aims to analyze the construction scheduling of module I and module II using the Critical Path Method (CPM). The research method used is descriptive quantitative through the preparation of network planning and S-Curve analysis. The results of the study show that there are four scheduling alternatives, namely Schedule A (existing) for 59 days in block 122, Schedule B 54 days, Schedule C 57 days, and Schedule D 54 days. Scheduling B and D are the most optimal alternatives because painting, grand assembly, and quality control activities are on a non-critical path so they have slack and can accelerate the project duration. The results of the S-Curve analysis show that the plan progress in September 2025 increased from 65.8% to 99.4% in December 2026, the actual progress achievement (A) in March 2026 was only 31.1% while the plan was 84.6%, the assumed progress of the CPM results (B; D) reached 37.3% so there is a difference in progress achievement of 6.2%.
Co-Authors Achmad Syamsul H Akhmad Basuki Widodo Aris Supriyadi Bina Susila Intan Baroroh Mark Jefferson