Analisis Pengaruh Variasi Coating Elektroda dan Heat Input pada Pengelasan SMAW dalam Air Laut terhadap Sifat Mekanik, Metalografi, dan Prediksi Laju Korosi Wldjoint Baja A36

Putra, Arifin Amanto (2019) Analisis Pengaruh Variasi Coating Elektroda dan Heat Input pada Pengelasan SMAW dalam Air Laut terhadap Sifat Mekanik, Metalografi, dan Prediksi Laju Korosi Wldjoint Baja A36. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sejalan dengan berjalannya zaman, teknologi konstruksi bangunan laut berkembang sangat cepat dan sudah banyak variasi metode reparasi bangunan laut yang dapat menjadi alternatif. Tetapi perlu penanganan khusus dan perhatian lebih pada metode reparasi yang akan digunakan agar proses reparasi tersebut menjadi maksimal. Oleh karena itu, penelitian ini bertujuan untuk mengetahui pengaruh variasi Coating Elektroda berupa pernis dan lilin serta heat input sebesar 1.0 kJ/mm dan 1.3 kJ/mm pada SMAW underwater wet welding baja ASTM A36. Pada sifat mekanik, didapatkan kekuatan tarik dan kekerasan vickers tertinggi pada pengelasan menggunakan lilin dan heat input 1.3 kJ/mm dengan ultimate strength sebesar 545.38 Mpa dan kekerasan vickers sebesar 176.93 HV. Hal itu dikarenakan pada pengelasan menggunakan lilin dan heat input 1.3 kJ/mm memiliki presentase ferrite weld metal yang paling kecil yaitu 61 % dan lebar HAZ yang paling besar yaitu 1.58 cm. Semakin kecil presentase ferrite, maka kekuatan tarik akan semakin tinggi dan semakin lebar HAZ akan memiliki nilai kekerasan yang semakin tinggi. Pada prediksi laju korosi, nilai terbesar didapat pada penggunaan pernis dan heat input 1.0 kJ/mm, yaitu 3.61 mmpy dengan kategori buruk (Poor). Maka, prediksi laju korosi yang didapatkan berbanding terbalik dengan nilai sifat mekanik. ========================================================= Marine building technology is developing very fast and there have been many variations of methods for repairing marine building that can be used as an alternative. However, there is a need for special handling of the repair method that be used so that the repair process is maximized. Therefore, this study aims to understand the effect of varnish and wax as electrodes coating and heat input of 1.0 kJ / mm and 1.3 kJ / mm on SMAW underwater wet welding weldjoint of A36 steel. In the mechanical properties, the highest tensile strength and vickers hardness were obtained in the use of wax as electrode coating and heat input of 1.3 kJ/mm with ultimate strength of 545.38 Mpa and vickers hardness of 176.93 HV. That is because the use of wax as electrode coating and heat input of 1.3 kJ / mm has the smallest percentage of ferrite weld metal, which is 61% and also the widest HAZ of 1.58 cm. The smaller ferrite percentage makes the tensile strength higher, and the wider of Heat Affected Zone makes the vickers hardness higher. In the prediction of corrosion rate, the highest value was obtained on the use of wax as electrode coating and heat input of 1.0 kJ/mm, which is 3.61 mmpy in the poor category. So, the prediction of corrosion rate is inversely proportional to the value of mechanical properties.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Underwater Wet Welding, Coating Elektroda, Heat Input
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA492.W4 Welded joints V Naval Science > VC Naval Maintenance V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Arifin Amanto Putra
Date Deposited:	04 Jun 2026 04:16
Last Modified:	04 Jun 2026 04:16
URI:	http://repository.its.ac.id/id/eprint/60390

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