Binathara, Priagung Surya (2018) Pengaruh Variasi Arus Pulsed Current, Continuous Current, dan Flowrate Gas Pelindung Argon Terhadap Kekerasan dan Struktur Mikro Dengan Metode Tungsten Inert Gas (TIG). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Paduan Tembaga-Nikel Material 90/10 CuNi merupakan salah satu material utama pemakaiannya di bidang kemaritiman, karena sifatnya yang tahan terhadap korosi baik. Paduan ini dapat disambung dengan metode las TIG. Parameter pengelasan yang tepat dengan metode las TIG dibutuhkan agar meghasilkan las yang baik. Penelitian pengelasan ini dilakukan dengan metode TIG dengan parameter variasi arus continuous current 100 Ampere, pulsed current 3 Hz, pulsed current 5 Hz dan flowrate gas pelindung argon 8 L/menit 12 L/menit, dan 16 L/menit/ Pengujian yang dilakukan pada penelitian ini adalah uji makro, uji komposisi kima, uji XRD, uji Mikro, dan uji kekerasan menggunakan Microvickers. Dari hasil peneltian fasa yang terbentuk setelah pengelasan adalah αCu. Struktur mikro yang terbentuk pada bagian weld metal adalah dendritik sedangkan pada bagian base metal adalah poligonal. Seiring meningkatnya flowrate gas pelindung argon, kekerasan semakin meningkat, dan pengelasan menggunakan arus pulsed current memiliki kekerasan lebih tinggi jika dibandiingkan dengan arus continous current. Nilai kekerasan tertinggi dihasilkan pada pengelasan variasi arus pulsed current 5 Hz dan flowrate gas pelindung argon 16 L/menit dengan nilai kekerasan 118 HV
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Copper-Nickel alloy of 90/10 CuNi is one of the main material that used in maritime aspect,. because it has good corrosion ressitance. This alloy can be joined by TIG method welding. But, there are problems because of welding parameter that not suitable with the material.. This study was conducted using continous current 100 Ampere, 3 Hz pulsed current, and 5 Hz pulsed current with flowrate of shielding gas are 8 L/minutes, 12 L/minutes, and 16 L/minutes. There are several such observations Macroscopy testing, chemical composition testing, XRD testing, microstructure testing, and hardness tesring result to support this study. After all of specimens tested, the phase form that formed in weld metal section is αCu and the shape of microstructure is dendritic. The microstructure shape that formed in base metal is polygonal. The number of Hardness increases as it increases of flowrate gas shielding, and the result of welding process with pulsed current arc welding has higher hardness number than the result of welding with continous current. The highest number of hardness in this study is the welding process with 5 Hz pulsed arc current and 16 L/minutes flowrate gas shielding by 118 HV.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 671.521 Bin p 3100018076478 |
| Uncontrolled Keywords: | CuNi 90/10, TIG, Continous Current, Pulsed Current, Flowrate |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TN Mining engineering. Metallurgy > TN879.6 Welding T Technology > TS Manufactures > TS227 Welding. |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Priagung Surya Binathara |
| Date Deposited: | 06 Feb 2019 08:46 |
| Last Modified: | 23 Oct 2020 05:43 |
| URI: | http://repository.its.ac.id/id/eprint/53573 |
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