Analisa Teknis Pengelasan Dissimilar Material Antara AA 6063 Dan AA 5083 Ditinjau Dari Aspek Mekanik Dan Metalurgi Pada Bangunan Kapal

Khoirofik, Imam (2016) Analisa Teknis Pengelasan Dissimilar Material Antara AA 6063 Dan AA 5083 Ditinjau Dari Aspek Mekanik Dan Metalurgi Pada Bangunan Kapal. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Aluminium seri 6063 merupakan paduan aluminium dengan unsur paduan pokok magnesium dan silicon, sedangkan aluminium seri 5083 merupakan paduan aluminium dengan unsur utama adalah magnesium. Paduan aluminium seri 5083 menjadi pilihan material shell lambung kapal, sedangkan seri 6063 sering digunakan sebagai stiffener pada shell lambung kapal. Sambungan las dissimilar diaplikasikan pada seri 6063 dengan seri 5083. Pada sambungan las dissimilar ini sering dijumpai kerusakan sambungan, (struktur las pada frame, bracket, collar 6063 dengan shell 5083), retak memanjang dan retak melintang pada daerah sambungan berbahan paduan aluminium dissimilar. Akan tetapi sambungan dissimilar paduan 6063 dengan 5083 belum ada data yang dapat dijadikan referensi sehingga dalam tesis ini dilakukan untuk menginvestigasi sambungan dissimilar antara 6063 dengan 5083. Perbaikan dilakukan dengan mevariasikan ampere las 110 , 140 dan 170, volt 22, kawat las ER 5356, proses las GMAW. Dari hasil pengujian pada proses pengelasan dissimilar antara material aluminium 6063 dengan material aluminium 5083 didapatkan bahwa terjadi sifat getas yang lebih tinggi pada daerah pengaruh panas material 6063, nilai hardness kekerasan pada daerah fusion line dan daerah pengaruh panas, dimana pada material 6063 lebih tinggi dari pada material 5083 (indikasi bahwa material 6063 berubah menjadi lebih getas dibanding material 5083). Pada nilai impact pada seri 6063 (12,40 j) lebih rendah dibandingkan dari seri 5083 (13,91 j). Besar kuat arus (Ampere), memberikan pengaruh pada nilai ketangguhan dan kekuatan hasil pengelasan aluminium pada proses las GMAW. Dari uji impact dapat dijadikan sebagai tolak ukur untuk mengevaluasi nilai ketahanan terhadap beban. =============================================================================================== 6063 aluminum is an aluminum alloy with magnesium and silicon as the principal alloying elements while the 5083 aluminum is an aluminum alloy with magnesium as the main ingredient. 5083 aluminum alloy is often chosen for the shell material of ship’s hull, whereas the 6063 aluminum is often used as a shell stiffener of ship’s hull. Dissimilar weld joint was applied between 6063 aluminum and 5083 aluminum. Dissimilar welded joints are often exposed to damage such as welding structure on the frame, brackets, and between 6063 collar with 5083 shell. In addition, dissimilar welded joints are also prone to other welding defects such as fusion-line cracks namely longitudinal crack and transverse crack. Dissimilar welding causes different meelting temperatures between the two materials resulting in a different microstructure. If the welding process uses different amperage, it will produce a different result resulting in a different quality. This research was conducted since there were no previous studies regarding this matter. The research aims to examine the parameters of how appropriate welding and welding process on welding defects, micro and macro structure of of welded materials andmechanical properties (tensile test, macro micro, hardness and impact). Improvements were made by applying various welding amperage of 110, 140 and 170, 22 volt, and using welding wire of ER 5356 through GMAW welding process. The results of the dissimilar welding process showed that there was high brittleness on Heat Affected Zone of 6063 AA. Hardness value in fusion line and Heat Affected Zone of 6063 AA is higher than that of 5083 AA. It indicates that the 6063 AA turns into a more brittle material compared to 5083 AA. 5083 AA has higher Impact value (13.60 j) than 6063 AA (12.00 j) indicating that cracks will easily propagate in 6063 AA compared to 5083 AA. Furthermore, pourosity defect was founded in weld metal. This defect can be a source of crack which will easily propagate to the weakest (brittle) area when there is load acting on the area. The amount of Heat Input will affect the value of toughness and strength of the weld. The higher the Heat Input used, the lower the value of toughness and strength of the weld.

Item Type: Thesis (Masters)
Additional Information: RTKe 623.843 2 Kho a
Uncontrolled Keywords: pengelasan Aluminium Paduan 5083 dan 6063, keretakan, macroetch, mechanical properties, & micro structure
Subjects: V Naval Science > VC Naval Maintenance > VC 270-279 Equipment of vessels, supplier,allowances,etc
V Naval Science > VC Naval Maintenance
Divisions: Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36101-(S2) Master Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 22 Aug 2017 02:58
Last Modified: 27 Dec 2018 02:11
URI: http://repository.its.ac.id/id/eprint/48704

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