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All Journal IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Ida Farida
Universitas Pertahanan RI
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Isolasi Selimut Api Pasca-Pengelasan terhadap Perilaku Mekanik Sambungan Las FCAW pada Baja EH36 Ade Putra Kurniawan; Ida Farida; Immanuel Heprianto Simanjuntak
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.356

Abstract

Welding of EH36 steel, a widely used high-strength material in ship construction, may compromise joint toughness when post-weld cooling rates are not properly controlled, thereby affecting the fusion integrity between the weld metal and the base metal. This study investigates the effectiveness of a Fire Blanket as a post-weld thermal insulation method to regulate cooling rates and enhance the deformation resistance of welded joints. Two EH36 welded specimens were fabricated using the flux-cored arc welding (FCAW) process: one without insulation and the other covered with a Fire Blanket immediately after welding. The cooling behavior of both specimens was monitored, and joint performance was evaluated through a side bend test conducted in accordance with BKI standards to assess fusion quality and mechanical robustness. The results indicate that the Fire Blanket substantially reduced the cooling rate, with the insulated specimen reaching near-ambient temperature after approximately 270 minutes, compared with about 120 minutes under natural cooling. This moderated cooling resulted in superior deformation capacity, as evidenced by a higher maximum bending load of 50.0 kN for the insulated specimen, compared with 41.2 kN for the uninsulated specimen, representing an improvement of 21.3%. This study presents an experimental approach to evaluating the use of a Fire Blanket as a post-weld insulation technique for EH36 steel. The findings demonstrate that controlled cooling with thermal insulation can effectively improve weld-joint reliability in ship construction and may serve as a practical strategy for broader structural welding applications.
Peningkatan Sifat Mekanik Komposit Aluminium yang Diperkuat dengan Material Berbasis Grafena: Tinjauan Metode dan Aplikasi Fabrikasi Angga Alfredo Purba; Hizkia Ginting; Ida Farida; Anang Setiawan; Rando Tungga Dewa
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.452

Abstract

Graphene-reinforced aluminum matrix composites (AMCs) have strong potential as lightweight materials with enhanced mechanical performance. This systematic review examined fabrication methods, optimal compositions, and mechanical improvements in AMCs reinforced with graphene nanoplatelets (GNP), graphene nanosheets (GNS), graphene oxide (GO), and reduced graphene oxide (rGO). The review covered 25 indexed international journal articles published between 2012 and 2024 from Scopus, Google Scholar, and Web of Science, with article selection following the PRISMA framework. The findings show that planetary ball milling, powder metallurgy, sintering, friction-stir-based processing, wet coating, and High Pressure Torsion (HPT) vary in effectiveness in achieving graphene dispersion and interfacial bonding. Hardness increased by up to 43%, tensile strength by 317%, and yield strength by 25% with rGO contents below 1 wt.%. HPT increased hardness from 64 to 122 HV at 0.25 wt.%, while RFSSW improved shear strength by 31% and fracture toughness by 20%. Key research gaps include limited hybrid fabrication studies and the lack of standardized industrial-scale testing parameters.
Co-Authors Ade Putra Kurniawan Anang Setiawan Angga Alfredo Purba Hizkia Ginting Immanuel Heprianto Simanjuntak Rando Tungga Dewa