Pratama, Raka Navy Aditya (2019) Analisis Perbandingan Sensitivitas Pendeteksian Terhadap Retak Pada Material Aluminium 5083 Dengan Variasi Frekuensi Pada Sambungan Las Di Pondasi Mesin Kapal Dengan Metode Eddy Current Testing (ECT). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Dalam bidang industri perkapalan, aluminium banyak menunjang dalam segi fabrikasi seperti pembuatan kapal patroli. Adanya cacat las pada pengelasan merupakan hal yang dapat berakibat fatal karena mendapatkan beban yang berulang seperti pada pondasi mesin kapal. Maka dari itu, diperlukan Non Destructive Testing (NDT) untuk mendeteksi adanya cacat di area yang susah terdeteksi. Penelitian ini bertujuan untuk mengetahui perbandingan sensitivitas dengan variasi frekuensi terhadap pendeteksian material las aluminium 5083 dengan ukuran 150 x 160 x 10 mm menggunakan metode Eddy Current Testing (ECT). Frekuensi probe yang digunakan pada penelitian ini adalah 15 kHz, 30 kHz, 500 kHz, dan 650 kHz. Sambungan las pada aluminium menggunakan jenis butt joint dan akan diberi retak buatan di bagian weld metalnya
Hasil dari penelitian ini menunjukkan variasi frekuensi pada probe akan berpengaruh terhadap dua hal yaitu ketinggian sinyal dan kemampuan kedalaman penembusan. Semakin besar frekuensi yang digunakan semakin tinggi juga sinyal indikasi retak yang muncul. Hal tersebut dibuktikan adanya peningkatan tinggi sinyal indikasi suatu retak jika frekuensinya semakin tinggi juga demikian berlaku sebaliknya. Nilai SDP (Standard Depth of Penetration) frekuensi 15 kHz, 30 kHz, 500 kHz, dan 650 kHz secara urut sebesar 0.996 mm, 0.704 mm, 0.172 mm, dan 0,151. Sedangkan nilai EDP (Efective Iepth of Penetration) secara urut sebesar 2.987 mm, 2.112 mm, 0.517 mm, dan 0.454 mm. Frekuensi mempengaruhi kemampuan kedalaman penembusan, semakin besar frekuensi semakin berkurang kemampuan kedalaman penembusan suatu sinyal indikasi retak. Hal tersebut dibuktikan semakin besar frekuensi semakin kecil nilai SDP (Standard Depth of Penetration) dan EDP (Efective Depth of Penetration) nya. arus eddy tidak langsung hilang begitu saja saat frekuensi melebihi nilai EDPnya, melainkan hilang secara perlahan hingga arus eddy tidak mampu menembus lebih dalam lagi. Pada penelitian ini, sinyal indikasi retak pada frekuensi 15 kHz dan 30 kHz mampu menembus hingga kedalaman 5.00 mm, sedangkan pada frekuensi 500 kHz dan 650 kHz mampu menembus secara urut hingga 2.00 mm dan 1.5 mm.
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In the shipbuilding industry, aluminum is widely used such a for patrol boat building. The presence of welding defects in welding can be fatal due to get a load of repetitive as the foundation of the ship's engine. Therefore, Non Destructive Testing (NDT) is needed to detect any defects in areas that are difficult to detect. This study purpose to compare the sensitivity of detection with frequency variations in the detection of 5083 aluminum welding material with dimensions of 150 x 160 x 10 mm using the Eddy Current Testing (ECT) method. The frequency of the probes used in this study were 15 kHz, 30 kHz, 500 kHz, and 650 kHz. Welded joints on aluminum used is the butt joint and given an artificial crack at the weld metal. The results of this study indicate the variation of frequency on the probe affect two things the height of the signal and the depth of penetration capability. The greater the frequency used, the higher the signal for crack indication. This is proved by an increase in signal height indication of a crack if the frequency is higher. SDP (Standard Depth of Penetration) values of frequencies 15 kHz, 30 kHz, 500 kHz and 650 kHz in sequence were 0.996 mm, 0.704 mm, 0.172 mm and 0.151. While the EDP (Effective Depth of Penetration) values were 2,987 mm, 2,112 mm, 0.517 mm and 0.454 mm. The frequency affects the ability of the depth of penetration, the greater the frequency the less the ability of the depth of penetration of a signal indication of cracking. This is evidenced that the greater the frequency the smaller the value of SDP (Standard Depth of Penetration) and EDP (Effective Depth of Penetration). Eddy currents were not immediately disappeared when the frequency exceeds the EDP value, but slowly lost to eddy currents were not able to penetrated deeper. In this study, crack signal indications at frequencies of 15 kHz and 30 kHz are able to penetrate to depths of 5.00 mm, while at frequencies 500 kHz and 650 kHz are able to penetrate sequentially up to 2.00 mm and 1.5 mm.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSPe 671.52 Pra a-1 2019 |
| Uncontrolled Keywords: | Aluminum, Eddy Current Frequency, Eddy Current Testing, Surface Crack |
| Subjects: | V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis |
| Depositing User: | Raka Navy Aditya Pratama |
| Date Deposited: | 17 Apr 2024 08:37 |
| Last Modified: | 17 Apr 2024 08:37 |
| URI: | http://repository.its.ac.id/id/eprint/73079 |
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