Pah, Jack Carol Adolf (2018) Pengaruh Waktu Dan Tekanan Gesek Terhadap Kekuatan Tarik Sambungan Dissimilar Metals Pada Pengelasan Gesek. Magister thesis, Universitas Brawijaya.
Abstract
Penelitian ini bertujuan untuk mendapatkan pengaruh variabel waktu gesek dan tekanan gesek terhadap kekuatan tarik sambungan dua material tidak sejenis, aluminium paduan AA6061 dan baja karbon, pada las gesek continuous drive. Variasi waktu gesek yang diterapkan yaitu 5 detik, 7 detik, 9 detik, 11 detik, pada setiap variasi tekanan gesek 24 MPa, 32 MPa, 40 MPa. Variabel terkontrol dalam proses pengelasan gesek ini yaitu kecepatan putar 1600 rpm, tekanan tempa 79 MPa yang diterapkan selama 60 detik, dan diameter permukaan gesek spesimen 15 mm. Kekuatan dari sambungan yang terbentuk, dievaluasi berdasarkan kekuatan tarik sambungan. Pengamatan terhadap perubahan temperatur selama proses pengelasan, distribusi nilai kekerasan Vickers disekitar daerah sambungan, dan foto mikro, digunakan sebagai data-data penunjang dalam analisa. Hasil penelitian menunjukan semakin lama waktu gesek diterapkan, akan menyebabkan kekuatan tarik sambungan meningkat sampai nilai maksimum dan kemudian kekuatannya kembali menurun. Peningkatan kekuatan tarik sambungan tidak bertambah kuat secara linier, akibat variasi tekanan gesek, di waktu gesek 9 detik dan 11 detik. Pada waktu gesek 5 detik dan 7 detik, pembesaran tekanan gesek, menyebabkan peningkatan kekuatan tarik sambungan yang linier. Terjadi peningkatan ketebalan dari suatu lapisan yang bersifat getas pada batas sambungan, akibat dari semakin tinggi temperatur pada proses pengelasan. Peningkatan ketebalan lapisan getas ini menyebabkan kekuatan tarik sambungan semakin melemah
English Abstract
The objective of this research was to get the effect of friction time and friction pressure on the tensile strength of the joining of two dissimilar materials, aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction time were 5 seconds, 7 seconds, 9 seconds, and 11 seconds, at each variation of friction pressures, 24 MPa, 32 MPa, and 40 MPa. Controlled variables in this friction welding process were rotational speed of 1600 rpm, upset pressure of 79 MPa which was applied for 60 seconds and diameter of friction surface of specimens which were 15 mm. The resulting strength of the bonding were than evaluated on the basis of tensile strength. Observations of temperature change during the welding process, the distribution of Vickers hardness values around the bonds area, and micro photographs, were used as support to the analysis. The results showed that the longer friction time was applied, the higher tensile strength of the bonds would be, until it began to decrease after a certain maximum value of the tensile strength had been reached. Increased of the tensile strength of the bonding did not occur linearly due to the variation of friction pressure at 9 seconds and 11 seconds of friction time. At 5 seconds and 7 seconds of friction time, increase of friction pressure caused a linear increase of tensile strength. Higher temperatures in the welding process increased the thickness of brittle layer at the bonds boundary. The increase of the brittle layer thickness causes decrease of the tensile strength of the bonds.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | TES/671.52/PAH/p/2018/041802692 |
| Uncontrolled Keywords: | WELDING, FRICTION, FRICTION WELDING, DISSIMILAR WELDING, WELDED JOINTS |
| Subjects: | 600 Technology (Applied sciences) > 620 Engineering and allied operations > 620.1 Engineering mechanics and materials > 620.18 Nonferrous metals > 620.186 Alumunium |
| Divisions: | S2/S3 > Magister Teknik Mesin, Fakultas Teknik |
| Depositing User: | Nur Cholis |
| Date Deposited: | 14 May 2018 01:33 |
| Last Modified: | 22 Oct 2021 01:06 |
| URI: | http://repository.ub.ac.id/id/eprint/10428 |
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