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Moh. Syaiful Amri
Politeknik Perkapalan Negeri Surabaya
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Analisis Pengaruh Ukuran GAP dan Jenis Kampuh pada Proses Pengelasan SMAW-FCAW Beda Ketebalan (Unequal Thickness) Posisi 6gr Terhadap Radiography Test, Sifat Mekanik dan Struktur Mikro Kelvin Aprilianda Bela; Bachtiar; Moh. Syaiful Amri
Integrative Perspectives of Social and Science Journal Vol. 3 No. 07 Juli (2026): Integrative Perspectives of Social and Science Journal
Publisher : PT Wahana Global Education

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Abstract

Posisi pengelasan 6GR pada sambungan T, Y, dan K banyak digunakan pada struktur lepas pantai, namun sering menimbulkan repair pada root weld akibat desain joint yang kompleks dan ketidaktepatan fit-up sehingga terjadi lack of root penetration. Penelitian ini bertujuan menganalisis pengaruh ukuran root gap 3 mm dan 4 mm serta jenis kampuh single bevel dan kampuh J pada pengelasan SMAW-FCAW beda ketebalan terhadap hasil radiography test, sifat mekanik, dan struktur mikro. Hasil radiografi menunjukkan root gap 4 mm tidak menghasilkan cacat internal, sedangkan root gap 3 mm menunjukkan cacat slag inclusion. Uji Two-Way ANOVA menunjukkan variasi gap dan jenis kampuh tidak berpengaruh signifikan terhadap kekuatan tarik karena seluruh spesimen patah pada base metal. Uji bending menunjukkan indikasi open discontinuity lebih banyak pada gap 3 mm, namun seluruh spesimen memenuhi kriteria AWS D1.1. Pengamatan makro menunjukkan kampuh J menghasilkan area HAZ rata-rata terbesar, sedangkan struktur mikro menunjukkan variasi sebaran ferrite, pearlite, dan acicular ferrite akibat peningkatan heat input.
Comparative analysis on metallography, hardness, and corrosion rate of repair methods in welding tube SA-213 to tubesheet SA-240 Moh. Syaiful Amri; Alvalo Toto Wibowo; Muh. Ofirsyah Apriliano Ananda Dzikrilla
Journal of Welding Technology Vol 7, No 2 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v7i2.7711

Abstract

In the fabrication process of heat exchangers, tube-to-tubesheet weld joints are often prone to defects such as porosity, cracking, undercut, and other forms of damage that can degrade the quality and performance of the equipment. To address these issues, repair becomes a crucial solution. However, due to the lack of standardized repair procedures, alternative methods such as TIG dressing and flush and reweld using filler metals of various diameters are commonly applied for the sake of time and cost efficiency. This study aims to compare three repair methods TIG dressing, flush and reweld using diameters 1.6 mm filler, and diameters 2 mm filler on macrostructure, microstructure, hardness, and corrosion rate of tube-to-tubesheet weld joints. The tests conducted include macro and micro examinations, Vickers Hardness testing, and corrosion rate. The results showed that Repair 1 (TIG dressing) produced a finer ferrite phase in the weld metal area and achieved the highest average Hardness value of 234.4 kgf/mm², although it also exhibited the highest corrosion rate at 0.44053 mm/year. In contrast, Repair 2 showed the lowest Hardness in the weld metal area, with an average of 221.9 kgf/mm², and the lowest corrosion rate of 0.28036 mm/year. Therefore, the TIG dressing method proves to be more effective in improving Hardness, but at the expense of an increased corrosion rate
Co-Authors Adam, Mukhlis Alfriansyah Aditya Alvalo Toto Wibowo Andi Ari W Anggara, Dika Ari, Muhamad Arya Triananda Kusuma Bachtiar Bachtiar Bachtiar Budi Kurniyanto, Hendri Budi, Hendri Budi Kurniyanto Dika Anggara Erdiyansyah A Fais Hamzah Faiz Hamzah, Faiz Firmansyah, Moch. Aria Hakim, Achmad Reyhan Fajar Haruri, Rikko Harli Hendri B Hendri Budi Kurniyanto Ilham Kurniawan Imam Khoirul R Imam Khoirul Rohmat Isworo, Annas Dwi Kelvin Aprilianda Bela Khoirul Rahmat, Imam Kurniyanto, Hendri Budi Kusminah, Imah Luluk Leonard, Rikky M. Habib Muzzakki M. Thoriq Wahyudi Masyhuri Prasetyo, Mohamad Fanni Miftachul Munir, Moh Miftachul Munir, Moh. Mochammad Karim Al Amin Moh M Munir Moh. Miftachul Munir Moh. Miftachul Munir Mohammad Miftachul Munir Mohammad Thoriq Wahyudi Muh. Ofirsyah Apriliano Ananda Dzikrilla Muhamad Ari Muhammad Saka Hafshah Mukhlis Mukhlis Mukhlis Mukhlis Mukhlis Mukhlis Mukhlis Mukhlis Mukhlis Mustain, Eko Nisazarifa, Adristi Novaldi, Azriel Harsha Pradana, Dika Septya Prastyawan, Rikat Eka Rizha Agustian Dwi Susanto Rohman, Muhammad Yuqal Abi Ruddianto Sasongko, Kukilo Edy Toto, Alvalo Victoria, Jaka Wahyudi, Mohammad Thoriq Wibowo, Alvalo Toto Widodo, Eriek Wijaya, Alvido Toto Yuansa Septianto Yudi Eko Suyono