Hilmy, Zakwan (2019) Analisis Perbandingan Secara Teknis dan Ekonomis Proses Pengelasan GMAW Pulsed Terhadap GMAW Short Circuit Pada Sistem Perpipaan Offshore. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pengelasan merupakan kegiatan yang kegiatannya kerap dilakukan pada industri-industri fabrikasi seperti industri perkapalan maupun bangunan lepas pantai. Hal tersebut dikarenakan penggunaan baja sebagai material utama pada struktur maupun sistem perpipaan pada bangunan itu sendiri. GMAW merupakan salah satu jenis pengelasan yang sudah umum digunakan pada fabrikasi. GMAW memiliki beberapa moda transfer dimana tiap-tiap moda transfer memiliki kelebihan dan kekurangan masing-masing. Pulsed merupakan salah satu moda transfer yang dianggap lebih optimal dibandingkan moda transfer lain. Sedangkan short circuit merupakan salah satu moda transfer yang sangat jarang digunakan karena menghasilkan spatter dan beresiko tinggi pada cacat las. Hal tersebut menyebabkan munculnya inovasi (mesin regulated metal depositon atau RMD) untuk memodifikasi arus pada short circuit tersebut sehingga kekurangan dari short circuit klasik dapat diatasi. Penelitian ini melakukan analisis hasil pengelasan pada pipa baja A106 yang biasa digunakan pada sistem perpipaan offshore dengan menggunakan moda transfer pulsed yang dibandingkan terhadap hasil pengelasan menggunakan moda transfer short circuit yang dimodifikasi menggunakan mesin RMD. Hasil yang didapatkan adalah pengelasan dengan moda transfer short circuit modified gas pelindung 80%Ar+20% Co2 memberikan hasil terbaik terhadap aspek teknis maupun ekonomis yaitu profil weld bead yang baik serta efesiensi dari biaya pengelasan. Sedangkan penggunaan moda transfer pulsed dengan gas pelindung 100% Co2 memberikan hasil pengelasan yang lebih baik dibandingkan dengan moda transfer short circuit modified gas pelindung 100% Co2 yaitu profil weld bead yang lebih konsisten serta level spatter yang sedikit.
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Welding is a process which commonly performed in fabrication industries such as shipyard or offshore industries. It because the stell has been used widely as a main material in the structure or piping system. GMAW is one of most popular welding method that commonly used in structural fabrication and has a several transfer mode. Each of transfer mode has an advantage and weakness. The pulsed is one of transfer mode which has many advantages than another transfer modes. Whereas, the short circuit transfer mode is the most rarely used because this transfer mode produces a high spatter level and high-risk welding defect. It makes the innovation to modify this transfer mode so that the disadvantages from classic short circuit can be solved. This research would be doing analysis on the result of A106 carbon steel welding process that always used in the offshore piping system. The welding process uses pulsed transfer mode will be compared to the modified short circuit. The result is a modified short circuit that using 80%Ar+20%Co2 shielding gas gives the best result according to technical and cost aspect, that is good weld bead profile and more efficient at welding expense. Pulsed transfer modes that used gives a better result than modified short circuit transfer mode which using 100% Co2 as a shielding gas. The result of using pulsed transfer mode is more consistency level on weld bead and less spatter level which produces.
Item Type: | Thesis (Masters) |
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Additional Information: | RTPe 671.52 Hil a-1 2019 |
Uncontrolled Keywords: | GMAW, pulsed, short circuit, A106, Regulated Metal Deposition, offshore piping system |
Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA492.W4 Welded joints T Technology > TS Manufactures T Technology > TS Manufactures > TS227 Welding. V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM298.5 Shipbuilding industri. Shipyards |
Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36101-(S2) Master Thesis |
Depositing User: | Hilmy Zakwan |
Date Deposited: | 29 Sep 2021 04:34 |
Last Modified: | 29 Sep 2021 04:34 |
URI: | http://repository.its.ac.id/id/eprint/61265 |
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