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All Journal Journal of Welding Technology Jurnal Teknologi Maritim
Ari, Muhamad
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Perbandingan Backing Gas Argon Dan H2-N2 Pada Pengelasan Material Cu-DHP Dengan Proses GTAW Terhadap Kekuatan Tarik Dan Metallograhy Khoirul Rohmat, Imam; Munir, Moh Miftachul; Fadillah, Mochamad Wildan; Ari, Muhamad; Anggara, Dika
Jurnal Teknologi Maritim Vol. 8 No. 2 (2025): Jurnal Teknologi Maritim
Publisher : Pusat Penelitian dan Pengabdian Masyarakat Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/jtm.v8i2.81

Abstract

Proses pembuatan condenser umumnya material yang digunakan adalah tembaga dan dilakukan dengan proses pengelasan menggunakan GTAW (Gas Tungsten Arc Welding). Material Cu-DHP (Phosphorus deoxided copper) merupakan material yang memiliki konduktivitas termal yang baik. Backing gas yang digunakan adalah Argon 100%, dan campuran gas Hidrogen 20% - Nitrogen 80%. Penelitian ini difokuskan untuk evaluasi pada kekuatan tarik dan metallography. Spesimen yang digunakan adalah pipa Cu-DHP dengan diameter 88,9mm dan tebal 4,8mm yang disambung menggunakan sambungan butt joint. Pengujian dilakukan secara destruktif (uji tarik dan metallography). Hasil penelitian menunjukan bahwa backing gas campuran Hidrogen 20% - Nitrogen 80% menghasilkan penetrasi dengan kedalaman 8,60 mm sedangkan backing gas argon menghasilkan kedalaman 7.26 mm, di struktur mikro terdapat fasa Cu-α, dan Cu3P serta hasil struktur mikro backing gas campuran Hidrogen 20% Nitrogen 80% menghasilkan Cu3P pada weld metal dibandingkan struktur mikro backing gas argon 100%. Nilai kekuatan tarik rata-rata backing gas campuran Hidrogen 20% - Nitrogen 80% menghasilkan 198.84 Mpa sedangkan nilai kekuatan tarik rata-rata backing gas argon sebesar 191.25 Mpa.
Analysis of quenching temperature variations in the heat straightening processFor multiple ripair FCAW welding HSLA SM490YA material Wahyudi, Mohammad Thoriq; Amri, Moh Syaiful Amri; Ari, Muhamad; Adam, Mukhlis; Hamzah, Fais; Novaldi, Azriel Harsha
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4633

Abstract

In the steel structure fabrication industry, girders play a crucial role as supporting beams during construction. The girder's components include end plates and beams, with the end plate serving as a critical connection point for the beam to the column. Welding at this juncture demands careful consideration. This analytical research focuses on the impact of multiple repair welding and quenching temperatures during the heat straightening process on the toughness and microstructure of HSLA SM490YA material, utilizing FCAW welding. To assess the effects of multiple repair welding, the study compares different repair scenarios—welding without repair, two repairs, and three repairs, all performed at a 50% depth. Subsequently, the heat straightening process occurs at a temperature of 650ºC on the repaired material. Post-heat straightening, quenching is carried out with temperature variations of 650ºC, 475ºC, and 300ºC. The findings indicate that the repair process during welding and subsequent quenching after the heat straightening process leads to a decrease in toughness values. This results in a finer grain size, with the material phase predominantly composed of pearlite. These research outcomes should be carefully considered by industry professionals, particularly in critical connections, when determining quenching temperatures after the heat straightening process in repair procedures.
Co-Authors Adam, Mukhlis Dika Anggara Fadillah, Mochamad Wildan Hamzah, Fais Khoirul Rohmat, Imam Moh. Syaiful Amri Munir, Moh Miftachul Novaldi, Azriel Harsha Wahyudi, Mohammad Thoriq