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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Journal La Multiapp
Mustaghfirin, Muhammad Anis
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering

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Analysis of the Effect of Shielding Gas Composition and FCAW Parameters on Shipbuilding Steel Plate for Ship Hull Production Al Amin, Mochammad Karim; Soelistijono, Rafi Febian; Nisazarifa, Adristi; Ma'ruf, Buana; Nugroho, Priyambodo Nur Ardi; Mustaghfirin, Muhammad Anis; Putera, Erwien Yuliansyah; Irawan, Bambang; Anggara, Dika; Widodo, Eriek Wahyu Restu; Bachtiar, Bachtiar; Ibad, Ilham Khoirul; Pratama Putra, Mochammad Yudha Aditya
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.67434

Abstract

Shielding gas is an important thing to protect the weld metal from impurities during the welding process. Ar, CO2, and mixing gas of Ar-CO2 are often used as a shielding gas in the marine industry. Differences in shielding gases and the current of welding could affect the microstructure and hardness of welding. This research analyzed the microstructure and hardness from the FCAW process of Shipbuilding Steel Plate using mixing gas and shielding gas of 100% CO2 with variations of current 180 and 195 A. The filler metal which has been used was A 5.20 E-71T1. The microstructure for the weld metal with 100% CO2 shielding gas was pearlite, widmanstatten ferrite, grain ferrite, and polygonal ferrite; otherwise for mixing shielding gas of 80% Ar + 20% CO2 and 75%Ar + 25% CO2 was found, the structure of pearlite, grain ferrite, and acicular ferrite. The effect of variations in the shielding gas composition and welding current that produced the highest hardness value was achieved with a shielding gas composition of 80% Ar + 20% CO2 and a current of 195 A, resulting in a hardness of 159.2 HV in the weld area.
Integrated Energy Audit for Workshop and Learning Systems Sa’diyah, Aminatus; Hakam, Mohamad; Nafiatus , Evi; Dhani, Mey Rohma; Mustaghfirin, Muhammad Anis; Kusuma, George Endri; Fairuza, Muchammad Nidhor
Journal La Multiapp Vol. 6 No. 6 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i6.2790

Abstract

The south workshop building is utilized for practical activities involving high machine loads, while the learning building is designated for theoretical activities. In order to optimize energy efficiency, a comprehensive audit of the lighting and electrical systems. A comparative case study approach was utilized for the analysis. A comprehensive audit of the lighting and electrical systems in both environments was conducted. An Internet of Things (IoT) monitoring system was utilized to track power consumption in both buildings. Illumination measurements were obtained using a lux meter and were subsequently compared with the Standard of Lighting (SNI) and the Permenaker standards. The average level of illumination was measured at 128.4 lux in the southern workshop and below 150 lux in some classrooms of the learning building. An electrical analysis revealed that the dominant load in the south workshop was from welding machines (10.9 kVA), whereas in the learning building, it was from the cooling system and electronic equipment. A comparative analysis of the south workshop building and the learning building reveals that both structures possess considerable potential for energy conservation. Recommendations for improvement include upgrading the lighting system and implementing an IoT system to support specific electrical load management for each building.
Co-Authors Bachtiar Bachtiar Dhani, Mey Rohma Dika Anggara Eriek Wahyu Restu Widodo Fairuza, Muchammad Nidhor Ilham Khoirul Ibad Kusuma, George Endri Ma'ruf, Buana Mochammad Karim Al Amin Mohamad Hakam Nafiatus , Evi Nisazarifa, Adristi Pratama Putra, Mochammad Yudha Aditya Priyambodo Nur Ardi Nugroho Putera, Erwien Yuliansyah RR. Ella Evrita Hestiandari Sa’diyah, Aminatus Soelistijono, Rafi Febian