BBLM melakukan penelitian mengenai proses pembuatan dan sifat mekanik suatu produk dengan pembuatan menggunakan proses pengecoran. Material yang digunakan paduan aluminium 356.0. Pengecoran dengan material aluminium memiliki kelemahan salah satunya cacat porositas gas yang diakibatkan kandungan hidrogen terlarut pada cairan logam, terbukti pengecoran pertama dengan material assessment 356.0 memiliki konsentrasi porositas yang tinggi, maka dilakukan prapenelitian untuk menekan biaya penelitian sebelum material asli diteliti. Prapenelitian menggunakan material limbah boogie wheel assessment alumunium paduan 356.0 bertujuan mengurangi konsentrasi porositas dengan menggunakan metode proses mengurangi gas hidrogen terlarut dalam cairan logam alumunium atau disebut proses degassing. Degassing atau proses pengurangan kandungan gas hidrogen terlarut pada cairan logam paduan aluminium dilakukan menjadi dua tahapan yaitu pertama dengan alat bernama rotary argon degassing yang berprinsip kerja mengaduk cairan logam paduan aluminium serta diberikan gas argon secara bersamaan saat proses pengadukan. Lama proses pengadukan dilakukan empat variasi waktu yaitu 5, 20, 30, dan 40 menit. Dari setiap variasi proses rotary argon degassing dilanjutkan tahapan kedua dengan pemberian dwell time degassing proses penahanan cairan aluminium pada temperatur dan waktu tertentu. Temperatur yang digunakan 690 °C dan variasi waktu selama 0, 15, 30, dan 45 menit. Dihasilkan spesimen untuk pengujian porositas dari variasi rotary argon degassing dan dwell time degassing dan spesimen untuk pengujian sifat mekanik uji tarik. Data pengujian dibentuk grafik perbandingan serta menjadi rekomendasi pembuktian mengenai pengaruh proses pengurangan gas hidrogen terlarut (rotary argon degassing dan dwell time degassing) terhadap porositas pada material paduan aluminium untuk dapat di aplikasikan pada proses pengecoran paduan aluminium lainnya. Kata kunci: Aluminium, porositas, degassing, metode, pengecoran.

BBLM conducts research on the process of making and the mechanical properties of a product with the manufacture using the casting process. Materials used aluminum alloy 356.0. Casting with aluminium material has the disadvantage of one of the defects of the gas porosity due to the dissolved hydrogen content in the metal fluid, proven the first casting with the material assessment 356.0 has the concentration of porosity that High, then do Prapenelitian to reduce research costs before the original material is researched. Prapenelitian use waste material Boogie Wheel Assessment aluminum alloy 356.0 aims to reduce the concentration of porosity by using the process method of reducing the dissolved hydrogen gas in aluminum metal fluid or called process Degassing. Degassing or dissolved hydrogen gas content reduction processes in aluminium alloy metals are carried out into the first two stages with a tool called Rotary Argon Degassing with working principle of stirring aluminum alloy metal fluid as well as Argon gas simultaneously during stirring process. The duration of stirring process is done four variations of time i.e. 5, 20, 30, and 40 minutes. From every variation of rotary process Argon degassing continued second stage with the administration of dwell time degassing aluminum fluid containment process at a certain temperature and time. The temperature used is 690 °c with time variation of 0, 15, 30, and 45 minutes. Produced specimens for the testing of porosity of rotary variations of argon degassing and dwell time degassing and specimens for the testing of mechanical properties of tensile test. The test Data was formed comparative graphs as well as a recommendation to prove the influence of dissolved hydrogen gas reduction processes (rotary argon degassing and dwell time degassing) against porosity in aluminium alloy materials to be Applied to other aluminium alloy casting processes. Keywords: Aluminium, porosity, degassing, method, casting.

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