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All Journal JTAM ROTARY Jurnal Sains Teknologi dalam Pemberdayaan Masyarakat Journal of Mechanical Engineering, Science, and Innovation
Irawansyah, Herry
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Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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PENGARUH PWHT (POST WELD HEAT TREATMENT) PADA PENGELASAN SMAW TERHADAP KEKERASAN DAN KEKUATAN TEKAN BAJA ST 37 Irawan, Dony; Irawansyah, Herry
JTAM ROTARY Vol 6, No 1 (2024): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v6i1.9340

Abstract

Pada proses pengelasan dapat timbul masalah berupa tegangan sisa setelah pengelasan yang tidak disadari. Tegangan sisa yang berlebihan dapat mengakibatkan terjadinya perubahan bentuk dan keretakan pada hasil pengelasan. Tegangan sisa dapat terjadi sebagai akibat pengelasan dilakukan tanpa melalui perlakuan panas terlebih dahulu. Tujuan dari penelitian ini adalah melakukan pengelasan Shielded Metal Arc Welding (SMAW) pada baja ST 37 dengan perlakuan panas yaitu Post Welding Heat Treatment (PWHT) dengan variasi tanpa perlakuan, 550°C, 600°C, dan 650°C selanjutnya melakukan dan menganalisis hasil uji kekerasan dan uji tekan. Pada uji kekerasan diperoleh hasil nilai tertinggi pada spesimen tanpa perlakuan PWHT (Post Weld Heat Treatment) di daerah weld metal sebesar 709,43 HVN. Sedangkan nilai terendah didapatkan pada spesimen dengan perlakuan PWHT (Post Weld Heat Treatment) di daerah base metal sebesar 236,45 HVN. Pada uji tekan diperoleh hasil nilai tertinggi pada spesimen tanpa perlakuan PWHT (Post Weld Heat Treatment) sebesar 838,46 MPa. Sedangkan nilai terendah didapatkan pada spesimen dengan perlakuan PWHT (Post Weld Heat Treatment) 550˚C sebesar 755,60 MPa. In the welding procedure, problems can arise in the form of residual stresses after welding that are not realized. Excessive residual stress will cause a permanent deformation, and can even cause cracks in the welding results. Residual stresses can occur as a result of welding being carried out without prior heat treatment. The goal of this research was to perform SMAW on ST 37 steel treatment with heat, namely Post Welding Heat Treatment (PWHT) with variations without treatment, 550°C, 600°C, and 650°C then perform and analyze results of hardness test and bending test. In the hardness test, the highest value was obtained for specimens without PWHT treatment in the weld metal area of 709.43 HVN. While The lowest possible value was attained in specimens treated with PWHT in the base metal area of 236.45 HVN. In the bending test, The maximum possible value was attained on the specimen without PWHT of 838.46 MPa. While the result with the lowest value was in specimens treated with 550˚C PWHT of 755.60 MPa.
Pendampingan dan Implementasi Teknologi Panel Surya Berpendingin Water spray Untuk Kemandirian Energi dalam Mendukung “Program Kampung Iklim” Di Kelurahan Loktabat Utara Kota Banjarbaru Irawansyah, Herry; Amrullah, Apip; Ansyah, Pathur Razi; Pagis, Arifah; Lukmana, Wahyu
Jurnal Sains Teknologi dalam Pemberdayaan Masyarakat Vol. 5 No. 1 (2024): Juli 2024
Publisher : Fakultas Teknik Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/5ex1ah75

Abstract

This research aims to study the mentorship and implementation of water-spray-cooled solar panel technology as an initiative to support energy independence within the Kampung Iklim Program in Loktabat Utara, Banjarbaru City. Using survey methods, system design, equipment construction, and community involvement, the program identifies local energy needs and designs an optimized solar panel system incorporating water spray cooling technology to enhance efficiency. The implementation results demonstrate a significant increase in solar panel efficiency, with reduced operational temperatures and increased energy output. This technology also positively impacts greenhouse gas emission reduction and improves the quality of life by providing more affordable energy access and creating job opportunities. This research confirms the potential of water-spray-cooled solar panels in achieving energy independence and supporting climate change mitigation efforts at the local level.
Green Algae to Green Fuel: Optimizing the Composition of Bio-Oil Additive Mixture from the Pyrolysis Process and RON 90 for Enhanced Engine Performance Amrullah, Apip; Irawansyah, Herry; Ghofur, Abdul; Subagyo, Rachmat; Mahmud, Rizal; Farobie, Obie
Journal of Mechanical Engineering, Science, and Innovation Vol 4, No 2 (2024): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2024.v4i2.6487

Abstract

This study explores the optimization of bio-oil additives derived from the pyrolysis of Ulva lactuca algae, blended with RON 90 gasoline to enhance engine performance and reduce emissions. Addressing the urgent need for sustainable energy, the research focuses on a relatively unexplored area—using algae-derived bio-oils in gasoline engines. The study aimed to identify the optimal blend ratio of bio-oil and gasoline to improve engine metrics such as brake specific fuel consumption (BSFC), thermal efficiency, and volumetric efficiency, while minimizing emissions like CO, CO2, and NOx. Experiments were conducted with bio-oil blended at 5%, 10%, and 15% by volume with RON 90 gasoline in a single-cylinder gasoline engine. Results showed that increasing bio-oil concentration led to improved fuel efficiency and thermal efficiency, along with significant reductions in CO and HC emissions. However, NOx emissions presented a complex trend, increasing at lower bio-oil ratios but decreasing significantly at the highest concentration. These findings suggest that algae-derived bio-oil can effectively enhance gasoline engine performance and reduce environmental impact, offering a novel, sustainable alternative fuel option. The study underscores the importance of optimizing blend ratios to maximize benefits and manage emissions, contributing valuable insights to sustainable energy research.
Co-Authors Abdul Ghofur Apip Amrullah Irawan, Dony Lukmana, Wahyu Mahmud, Rizal Obie Farobie Pagis, Arifah Pathur Razi Ansyah Rachmat Subagyo