ANALISIS PENGARUH HEAT INPUT PENGELASAN GMAW BAJA A36 TERHADAP KETAHANAN UJI TARIK, UJI BENDING, DAN PREDIKSI LAJU KOROSI

ANGGARA, KRISTOFORUS SATYA (2019) ANALISIS PENGARUH HEAT INPUT PENGELASAN GMAW BAJA A36 TERHADAP KETAHANAN UJI TARIK, UJI BENDING, DAN PREDIKSI LAJU KOROSI. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Baja ASTM A36 merupakan salah satu material yang dijadikan bahan konstruksi bangunan lepas pantai terapung. Penelitian ini dilakukan untuk mengetahui pengaruh variasi heat input terhadap uji kekuatan tarik, uji bending, uji metalografi, dan prediksi laju korosi pada pengelasan baja ASTM A36 dengan metode GMAW. Variasi heat input yang digunakan adalah 1.1 kJ/mm, 1.3 kJ/mm, dan 1.9 kJ/mm. Hasil pengujian tarik menunjukkan bahwa semakin tinggi heat input, maka kekuatan tarik semakin kecil. Hal ini ditunjukkan pada heat input 1.9 kJ/mm memiliki rata-rata kekuatan tarik terkecil sebesar 404.05 MPa. Hasil pengujian tekuk menunjukkan bahwa semakin tinggi heat input, maka open defect yang dihasilkan di area las semakin besar. Hal ini ditunjukkan pada heat input 1.9 kJ/mm terdapat open defect di sepanjang weld metal. Hasil pengujian metalografi menunjukkan bahwa semakin tinggi heat input, maka lebar HAZ semakin besar, sedangkan persentase fasa ferrite yang terbentuk semakin kecil. Hal ini ditunjukkan pada heat input 1.9 kJ/mm memiliki lebar HAZ terbesar yaitu 20 mm, namun memiliki persentase fasa ferrite terkecil yang terbentuk sebesar 54.7%. Hasil pengujian prediksi laju korosi menunjukkan bahwa semakin tinggi heat input, maka laju korosi akan semakin tinggi. Hal ini ditunjukkan pada heat input 1.9 kJ/mm memiliki laju korosi terbesar sebesar 0.443170 mmpy.
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ASTM A36 steel is one of the materials used in offshore floating construction. The purpose of this study was to determine the effect of heat input on tensile test, bending test, metallography test, and corrosion rate prediction test with the GMAW welding method. Gas Metal Arc Welding (GMAW) was used in three different heat inputs, including 1.1 kJ/mm, 1.3 kJ/mm, dan 1.9 kJ/mm. The results of the tensile
test showed that ultimate tensile strength decreased with increase in the heat input. The results showed that the lowest average ultimate tensile strength of 404.05 MPa occurred in the heat input of 1.9 kJ/mm. The results of the bending test showed that open defect increased with increase in the heat input. The results showed that the open defect along weld metal occurred in the heat input of 1.9 kJ/mm. The results of the metallography test showed that the wide HAZ increased with increase in the heat input, however ferrite phases percentage decreased with increase in the heat input. The results showed that the largest wide HAZ of 20 mm and the lowest ferrite phase percentage of 54.7% occurred in the heat input of 1.9 kJ/mm. The results of
the corrosion rate prediction test showed that corrosion rate increased with increase in the heat input. The results showed that the highest corrosion rate of 0.443170 mmpy occurred in the heat input of 1.9 kJ/mm

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Baja A36, Heat Input, GMAW
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Anggara Kristoforus Satya
Date Deposited:	21 May 2026 03:55
Last Modified:	21 May 2026 03:55
URI:	http://repository.its.ac.id/id/eprint/68760

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