Muhammad, Satrio (2016) Analisis Numerik Tegangan Sisa Dan Distorsi Aluminium 5083 Dengan Variasi Arus Listrik Sebagai Welding Heat Input. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tegangan sisa (residual stress) merupakan salah satu faktor yang diperhitungkan
untuk mengetahui adanya suatu potensi kegagalan (failure) pada suatu struktur. Distorsi
dapat mengakibatkan terjadinya missalignment maupun gangguan distribusi
pembebanan pada suatu struktur. Perhitungan numeris tegangan sisa dan perhitungan
numeris distorsi diterapkan pada material Aluminium 5083 berukuran 300 mm x 150
mm x 12 mm yang disambungkan melalui proses pengelasan dengan arus listrik yang
bervariasi yaitu 100 A, 125 A dan 150 A dengan 4 pass pengelasan dan tegangan listrik
21V. Perhitungan numeris tersebut dilakukan guna memvalidasi perhitungan distorsi
yang dilakukan pada material dan variasi arus listrik pengelasan yang sama melalui
proses pengelasan Gas Metal Arc Welding (GMAW) yang mengacu pada ASME
Section II dan Section IX. Berdasarkan perhitungan numeris didapatkan nilai tegangan
sisa maksimum 209 MPa dan distorsi maksimum senilai 2.04 mm untuk arus listrik 100
A yang menghasilkan 1680 watt heat input. Tegangan sisa maksimum senilai 211 MPa
dan distorsi maksimum senilai 2.7 mm untuk arus listrik 125 A yang menghasilkan
2100 watt heat input. 214 MPa tegangan sisa maksimum dan distorsi maksimum senilai
3.63 mm untuk arus listrik 150 A yang menghasilkan 2520 watt heat input. Kesimpulan
dari penilitian ini adalah setiap 25 A kenaikan arus listrik pengelasan antara 100 A
hingga 150 A terdapat peningkatan rata rata tengangan sisa maksimum senilai 1.18%
dan distorsi maksimum senilai 33.05%. Didapatkan pula rata – rata selisih nilai distorsi
antara perhitungan numeris dan uji laboratorium adalah senilai 5.36%
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Residual Stess is an important factor regarding the failure of a structure. The outcome
of distortion occuring on a structure may lead to missalignment and load distribution
disruption. Numerical calculations on residual stress and distortion are applied to
Aluminum 5083 with the dimension of 300 mm x 150 mm x 12 mm outboarded by
electricity current-varied-welding process. The variation of the welding electricity
currents are 100 A, 125 A, and 150 A using 4 welding passes and 21 V of welding
voltage. The numerical calculation on distortion validate the previous distortion data
calculated using the method of laboratory process using similiar electricity-currentvariation, similiar material properties and Gas Metal Arc Welding (GMAW) welding
process according to ASME Section II and Section IX. According to the numerical
calculation, 209 MPa of maximum residual stress and 2.04 mm of maximum distortion
are obtained from 100 A welding electricity current which results in 1680 watt of Heat
Input. Maximum residual stress of 211 MPa and maximum distortion of 2.7 mm are
obtained from 125 A welding electricity current which results in 2100 watt of heat
input. Maxium residual stress of 214 MPa and maximum distortion of 3.63 mm are
obtained from 150 A welding electricity current which results in 2520 watt of heat
input. As the conclusion of this study, For every 25 A increase in electricity current
within the range of 100 A to 150 A, There would be an increase of maximum residual
stress by 1.18% in average and an increase of maximum distortion by 33.05% in
average. The average distortion difference between numerical calculation and
laboratorical experiment is at 5.36%
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 623.843 2 Muh a |
| Uncontrolled Keywords: | Tegangan sisa, distorsi, Aluminium 5083, Multi-pass, Single Pass, Heat Flux |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN879.6 Welding |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 06 Apr 2020 02:19 |
| Last Modified: | 06 Apr 2020 02:19 |
| URI: | http://repository.its.ac.id/id/eprint/75686 |
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