Analisis Numerik Tegangan Sisa Dan Distorsi Aluminium 5083 Dengan Variasi Arus Listrik Sebagai Welding Heat Input

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% ================================================================================================== 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: https://repository.its.ac.id/id/eprint/75686

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