DOI: https://doi.org/10.14710/kapal.v0i0.67434

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

*Mochammad Karim Al Amin  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Rafi Febian Soelistijono  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Adristi Nisazarifa  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Buana Ma'ruf  -  Pusat Riset Teknologi Hidrodinamika, Indonesia
Priyambodo Nur Ardi Nugroho  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Muhammad Anis Mustaghfirin  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Erwien Yuliansyah Putera  -  Pusat Riset Teknologi Hidrodinamika, Indonesia
Bambang Irawan  -  Pusat Riset Teknologi Hidrodinamika, Indonesia
Dika Anggara  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Eriek Wahyu Restu Widodo  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Bachtiar Bachtiar  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Ilham Khoirul Ibad  -  PT Krakatau Steel (Persero) Tbk., Indonesia
Mochammad Yudha Aditya Pratama Putra  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
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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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