Tanujaya, Putra (2015) Studi Eksperimen Pengaruh Perubahan Arus Dan Debit Gas Pada Pengelasan Gtaw Terhadap Potensi Timbulnya Retak Dan Perubahan Kekerasan Pada Aluminium 2024 Setelah Mengalami Precipitation Hardening. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Aluminium alloy 2024 merupakan contoh paduan Al-Cu
yang memiliki kekuatan yield dan ketahanan terhadap korosi
yang baik. Perubahan sifat mekanik dan cacat akibat pengelasan
pada daerah weld metal, heat affected zone dan base metal
menjadi perhatian utama dalam proses pengelasan.
Penelitian secara eksperimen dilakukan pada aluminium
paduan 2024 yang telah mengalami precipitation hardening.
Metode pengelasan menggunakan Gas Tungsten Arc Welding
dengan polaritas AC. Pada kasus perubahan kekerasan akibat
perubahan arus, variasi sebesar 120A, 135A, 150A digunakan
sebagai parameter. Sedangkan pada kasus perubahan kekerasan
pada daerah HAZ akibat perubahan debit gas, variasi sebesar 6
lt/min, 10 lt/min, dan 14 lt/min digunakan sebagai parameter.
Berdasarkan hasil pengamatan dapat diketahui pada
setiap variasi debit gas yang digunakan, kenaikan besar arus
pengelasan secara umum menyebabkan kecenderungan
terbentuknya retakan pada daerah logam las. Selain itu dapat
pula diketahui Perbandingan lebar las (W) dan kedalaman
penetrasi (P) yang semakin kecil menyebabkan kecenderungan
terbentuknya centerline crack semakin besar.
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The research in the mechanical properties of aluminium
and its alloy increased along with the need for a strong and
lightweight material. As material becomes even more
sophisticated in their cehemical composition to provide even
better fuctionally specific properties, a more complete and
precise understanding of how materials can be joined for optimal
effectiveness and efficiency will become essential. Aluminum alloy
2024 is one of the exaple of Al-Cu alloy which has a good yield
strength and good corrosion resistance.
This experimental study conducted on artificially aged
2024 aluminum alloy. The welding on plate (bead on plate)
occurs for currents of 120 A; 135A; and 150 A and gas flow rate
of 6 lt/min; 10 lt/min; 14 lt/min for 3 mm workpiece thickness.
Based on observations can be seen on every variation of
the gas flow rate, the increase in welding current generally cause
formation of cracks in the weld metal region. Moreover, it can
also be known smaller the Comparison value of weld width (W)
and depth of penetration (P) can caused of forming the greater
the centerline crack.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 671.52 Tan s |
| Uncontrolled Keywords: | GTAW, Perubahan arus dan debit gas, Aluminium 2024, Retak |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 24 Apr 2018 08:33 |
| Last Modified: | 24 Apr 2018 08:33 |
| URI: | http://repository.its.ac.id/id/eprint/51801 |
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