DOI: https://doi.org/10.14710/kapal.v22i1.67434

Analysis of the Effect of Shielding Gas Composition and FCAW Parameters on Shipbuilding Steel Plate for Ship Hull Production

*Mochammad Karim Al Amin  -  Department of Welding Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Rafi Febian Soelistijono  -  Department of Welding Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Adristi Nisazarifa  -  Department of Welding Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Buana Ma'ruf  -  Research Center for Hydrodynamic Technology (PRTH), National Research and Innovation Agency (BRIN), Indonesia
Priyambodo Nur Ardi Nugroho  -  Department of Ship Design and Construction Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Muhammad Anis Mustaghfirin  -  Department of Sustainable Energy Engineering Technology, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Erwien Yuliansyah Putera  -  Research Center for Hydrodynamic Technology (PRTH), National Research and Innovation Agency (BRIN), Indonesia
Bambang Irawan  -  Research Center for Hydrodynamic Technology (PRTH), National Research and Innovation Agency (BRIN), Indonesia
Dika Anggara  -  Department of Welding and Fabrication Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Eriek Wahyu Restu Widodo  -  Department of Welding Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Bachtiar Bachtiar  -  Department of Welding Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Ilham Khoirul Ibad  -  Process & Product Development, PT Krakatau Steel (Persero) Tbk, Indonesia
Mochammad Yudha Aditya Pratama Putra  -  Department of Welding and Fabrication Engineering, Shipbuilding Institute of Polytechnic Surabaya (PPNS), Indonesia
Received: 14 Oct 2024; Revised: 18 Feb 2025; Accepted: 18 Feb 2025; Published: 16 Apr 2025.
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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.
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Keywords: Shielding Gas; Microstructure; Hardness Test; Welding Current; Steel Plate

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Section: Research Articles
Language : EN
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