Putra, Reza Daviza (2020) Analisis Kemampuan Pendeteksian Ultrasonic Testing dan Radiography Testing Terhadap Cacat Las Incomplete Fusion pada Pelat Tangki Baja ASTM A36 yang Dilapisi Overlay Cladding Stainless Steel di Kapal Chemical Tanker. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada chemical tanker ataupun kapal lainnya seringkali mengangkut bahan-bahan kimia
yang bersifat korosif. Bahan kimia tersebut tentu dapat merusak material baja karbon yang
banyak digunakan di industri perkapalan. Karena ketahanan baja karbon terhadap korosi
rendah, material seperti stainless steel sering digunakan sebagai overlay cladding pada bagian
dalam tangki tersebut. Untuk mengetahui cacat pada sambungan las material tersebut
diperlukan Non Destructive Test (NDT).
Penelitian ini bertujuan untuk mengetahui kemampuan pendeteksian pengujian
ultrasonic dan radiography terhadap cacat las incomplete fusion pada material ASTM A36
ukuran 200 x 100 x 12 mm yang dilapisi cladding stainless steel E309 sebagai spesimen uji.
Cacat las incomplete fusion dibuat secara manual pada lokasi ¼ T, ½ T dan ¾ T. metode
pengelasan cladding menggunakan pengelasan Shielded Metal Arc Welding. Ketebalan
cladding ditentukan sebesar 2 mm, 3 mm dan 4 mm.
Hasil dari penelitian ini menunjukkan bahwa penambahan ketebalan cladding
berpengaruh pada akurasi pembacaan alat uji ultrasonic. Berdasarkan perhitungan hasil
pengujian yang membandingkan lokasi diskontinuitas pada setiap ketebalan cladding
menunjukkan bahwa kemampuan pendeteksian ultrasonic yang lebih akurat adalah pada
spesimen cladding 2 mm pada lokasi diskontinuitas ¾ T. Hal ini dapat dibuktikan setelah
membandingkan data hasil pengujian dan data aktual diskontinuitas menunjukkan perbedaan
terkecil diantara semua spesimen yaitu 4.75%. Hasil pengujian radiography menunjukkan
bahwa pada lokasi ¾ T diskontinuitas tidak dapat terdeteksi untuk semua ketebalan cladding,
sedangkan pada lokasi lainnya diskontinuitas dapat terdeteksi untuk semua ketebalan cladding.
Bagian cladding yang mempunyai massa jenis lebih besar akan mengakibatkan penyerapan dan
penghamburan energi yang lebih besar, sehingga pada film hasil pengujian akan mendapatkan
hasil blur yang sama jika sumber radiasi mengarah pada cladding. Kemungkinan terbesar yang
akan terjadi jika sumber radiasi diarahkan ke bagian cladding adalah pada film radiography
hasil pengujian tidak dapat mendeteksi cacat las. Hal ini disebabkan massa jenis stainless steel
yang akan mengurangi energi dari sumber radiasi yang berakibat pada film hasil pengujian.
Kata kunci: Cladding, Ultrasonic Testing, Radiography Testing, Beam Spread, DAC.
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In chemical tanker or other vessels often carried corrosive substance. These subtances
could damage the carbon steel material that widely use in the shipping industry. Because carbon
steel has low resistance on corrosion, materials such as stainless steel are often use as overlay
cladding inside the tank that contact corrosion subtance. Non Destructive Test is needed to
determine discontinuity inside the weld joint.
This study aims to determine the detection capability of ultrasonic testing and
radiography of incomplete fusion weld defects in ASTM A36 material size 200 x 100 x 12 mm
coated with stainless steel cladding E309 as a test piece. Weld defect of Incomplete fusion are
made manually at locations ¼ T, ½ T and ¾ T. Clad welding method uses Shielded Metal Arc
Welding. Clad thickness is determined at 2 mm, 3 mm and 4 mm.
The results of this study indicate that the addition of clad thickness affects the accuracy
of the readings produced through ultrasonic test equipment. Based on the calculation of test
results comparing discontinuity locations at each cladding thickness shows that ultrasonic test
on the 2 mm cladding specimen at the discontinuity location ¼ T has better reading accuracy
compared to other specimen. This can be proven after comparing the test data and the actual
data discontinuity shows the smallest difference between all the specimen is 4.75% which has
2 mm thickness at ¼ T discontinuity location. Radiography test results show that at location ¼
T discontinuity cannot be detected for all cladding thicknesses, whereas at other locations
discontinuity can be detected for all cladding thicknesses. Cladding section which has a greater
density will travel more energy and scatter energy, so that the film results of the test will get
the same blurry results if the source of radiation produced in the cladding. The biggest
possibility that will occur if the radiation source is directed to the cladding section is on the
radiographic film. This reduces the density of stainless steel which will reduce the energy from
the radiation source which results in the test film.
Keywords: Cladding, Ultrasonic Testing, Radiography Testing, Beam Spread, DAC.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Cladding, Ultrasonic Testing, Radiography Testing, Beam Spread, DAC. |
| 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: | Reza Daviza Putra |
| Date Deposited: | 23 Aug 2021 12:56 |
| Last Modified: | 14 Jun 2024 04:11 |
| URI: | http://repository.its.ac.id/id/eprint/89125 |
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