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KAJIAN METODA NDT UNTUK DETEKSI CACAT LACK OF FUSION PADA LASAN (Mudi Haryanto, Andryansyah, Lily Suparlina)

Mudi Haryanto, MH and Andryansyah, AD and Lily Suparlina, LS (2009) KAJIAN METODA NDT UNTUK DETEKSI CACAT LACK OF FUSION PADA LASAN (Mudi Haryanto, Andryansyah, Lily Suparlina). In: Seminar Nasional Teknologi Energi Nuklir 2019 Padang, 18 September 2019 337 ISSN: 2355-7524, 18 September 2019, Universitas ANDALAS - PADANG-SUMETERA BARAT.

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Abstract

ABSTRAK KAJIAN METODA NDT UNTUK DETEKSI CACAT LACK OF FUSION PADA LASAN. Lack of fusion (kurang lebur) merupakan jenis cacat yang sangat berbahaya dalam struktur pengelasan karena mempunyai efek takikan (notch) sehingga retak mudah merambat dengan pembeban kecil. Lack of fusion terjadi karena logam las tidak sepenuhnya mengisi sambungan lasan, ada ruang antara logam las dan logam induk weld bead dimana terjadi lack. Tipe cacat ini sangat sulit di deteksi dengan metoda NonDestructive Test (NDT). Oleh karena itu perlu dilakukan penelitian dan pengkajian dengan cara pembuatan simulasi jenis cacat sebagai referensi cacat lack of fusion yang mempunyai orientasi cacat berbeda. Penelitian dilakukan pada penggunaan metode NDT radiografi dan ultrasonik yang diujikan pada cacat referensi lack of fusion untuk mengetahui kemampuan deteksinya. Sampel yang digunakan dari pabrikan sonaspection berupa cacat lack of side wall fusion, lack of root fusion dan laminar fusion (lack of inter run fusion). Tahapan pertama dilakukan pengujian dengan metoda ultrasonik, dilanjutkan dengan metoda radiografi. Hasil penelitian menunjukkan untuk deteksi cacat lack of side wall fusion, lack of root fusion dan laminar fusion (lack of inter- run fusion) tidak mampu di deteksi dengan satu metoda radiografi atau ultrasonik tetapi perlu dua-duanya untuk saling melengkapi. Kata kunci : lack of fusion, metoda NDT, radiografi, ultrasonik. ABSTRACT STUDY OF NDT METHOD FOR DETECTION OF LACK OF FUSION ON WELD. Lack of fusion (less melting) type of defect is very dangerous in the welding structure because it has a notch effect so that the cracking is easy with a small load. Lack of fusion occurs because the weld metal does not completely fill the weld connection, there is space between the weld metal and the parent metal or between the weld bead where there is lack. This type of defect is very difficult to detect by the Non-Destructive Test (NDT) method. Therefore, it is necessary to conduct research and study by making defect type simulation as a lack of fusion defective reference that has a different defect orientation. The study was performed on the usage of the radiographic and ultrasonic NDT methods that are tested on the lack of fusion reference defects to determine its detection ability. The sample used from the sonaspection manufacturer is a defect of lack of side wall fusion, lack of root fusion and laminar fusion (lack of inter-run fusion). The first stage of testing is the ultrasonic method, followed by radiographic methods. The results showed that detection of lack of side wall fusion, lack of root fusion and lack of inter run fusion was not able to be detected by a single radiographic or ultrasonic method, but both need to be complementary. Keywords: lack of fusion, NDT method, radiography, ultrasonic.

Item Type: Conference or Workshop Item (Paper)
Subjects: Keselamatan dan Keamanan Nuklir
Divisions: Pusat Teknologi dan Keselamatan Reaktor Nuklir
Depositing User: USER PTKRN BATAN
Date Deposited: 23 Jul 2020 08:45
Last Modified: 23 Jul 2020 08:45
URI: http://repo-nkm.batan.go.id/id/eprint/9901

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