Analisa Pengaruh Pengelasan Build-Up Pada Produk Casting Komponen Kapal Terhadap Timbulnya Indikasi Linier Pada Pengujian Magnetik Partikel Ditinjau Dari Sisi Metalurgi - Build-Up Welding Effect Analysis On Ship Component Casting Products Towards Linier Indication Appearance On Magnetic Particle Testing On Metallurgical Views

Prasetya, Rizky Andrianto (2018) Analisa Pengaruh Pengelasan Build-Up Pada Produk Casting Komponen Kapal Terhadap Timbulnya Indikasi Linier Pada Pengujian Magnetik Partikel Ditinjau Dari Sisi Metalurgi - Build-Up Welding Effect Analysis On Ship Component Casting Products Towards Linier Indication Appearance On Magnetic Particle Testing On Metallurgical Views. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan cast iron di dunia terus berkembang, termasuk di dunia industri perkapalan. Produk casting dapat memiliki kerusakan seperti crack sehingga untuk memperbaiki kerusakan tersebut dapat dilakukan pengelasan build-up¬. Penelitian ini akan membahas mengenai adanya indikasi yang timbul pada cast iron yang telah dilakukan pengelasan build-up pada pengujian magnetik partikel. Pada tugas akhir ini digunakan dua buah material yang dilas memakai elektroda E7016 dan elektroda ENi-CI. Perbedaan elektroda ini mempengaruhi hasil las-lasan dikarenakan faktor cara pengelasan yang berbeda seperti, arus, kandungan material pada elektroda, dan perlakuan panas. Setelah dilakukan pengelasan kemudian spesimen diuji magnetik partikel. Kemudian untuk melihat struktur mikro pada material setelah dilakukan pengelasan build-up, material dipotong untuk pengujian foto mikro. Pada pengujian foto mikro terdapat sembilan titik yang jaraknya masing masing adalah 5 mm, 10 mm, 15 mm, 20 mm di sisi kanan dari weld metal, 10 mm, 20 mm, 30 mm di sisi kiri dari weld metal, 10 mm, 20 mm, dibawah weld metal. Dari hasil pengujian magnetik partikel ditemukan adanya indikasi pada kedua material setelah dilakukan pengelasan. Dari hasil pengujian foto mikro terdapat dispersion of fine spheroidized carbide particles yang berupa sementit eutektik pada kedua material dan struktur tersebut dapat menyebabkan perubahan arah gaya magnet pada pengujian magnetik partikel yang menimbulkan indikasi linier. Hal ini disebabkan karena struktur tersebut memiliki kandungan karbon yang tinggi dan bersifat paramagnetik dan mengganggu induksi magnet pada pengujian magnetik partikel. ================================================================================================================== Cast iron has been widely used in shipbuilding industry recently. However, casting products tend to crack that can be repaired using build-up welding. This research investigates the presence of indication on build-up welded areas on cast iron products, during magnetic particle inspection. This study uses two materials that were welded using E7016 and ENi-CI electrodes. The two different type of electrodes affect welding result due to the different process, such as current, material composition, and heat treatment. After welding were accomplished, the materials were magnetic particle inspected. The materials were sectioned on the areas of build-up welded using microstructure photographs. There are nine spots were taken, 5 mm, 10 mm, 15 mm, and 20 mm on the right side from weld metal, and 10 mm, 20 mm, and 30mm on the left side from weld metal, and 10 mm, 20 mm below the weld metal. Results from the study using magnetic particle testing discovered that indications were existed on both materials after welding procedure. Results from metallography and microstructure on both material, dispersion of fine spheroidized carbide particles discovered as cementite eutectic on both material that caused magnet force line changed as magnetic particle test is used, causing nonrelevan linear indication. The reason of changes in magnet force line was caused by high carbon composite and paramagnetic nature in the materials which interrupted magnet induction on the magnetic particle testing.

Item Type: Thesis (Undergraduate)
Additional Information: RSPe Pra a
Uncontrolled Keywords: Magnetik Partikel, Cast iron, pengelasan build-up, NDT, Struktur mikro, Particle Magnetic, Cast iron, Build-up Welding, NDT, Micro Structure
Subjects: T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy
T Technology > TN Mining engineering. Metallurgy > TN879.6 Welding
V Naval Science > V Naval Science (General)
Divisions: Faculty of Marine Technology > Naval Architecture and Shipbuilding Engineering > (S1) Undergraduate Theses
Depositing User: Kiky Prasetya
Date Deposited: 16 Jan 2019 07:39
Last Modified: 16 Jan 2019 07:39
URI: http://repository.its.ac.id/id/eprint/57759

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