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All Journal Jurnal Teknik Sipil Macca Journal of Energy, Materials, & Manufacturing Technology
Halman
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Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering

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Kajian Pengaliran Banjir Sungai Terhadap Koefisien Kekasaran Manning pada Sungai Larompong Kabupaten Luwu Provinsi Sulawesi Selatan Halman; Ashad, Hanafi
Jurnal Teknik Sipil MACCA Vol. 5 No. 2 (2020): Jurnal Teknik Sipil MACCA
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/zkedzx88

Abstract

Sungai Larompong berada di Kabupaten Luwu Propinsi Sulawesi Selatan merupakan sungai utama dari DAS Larompong yang melintasi desa Komba, desa Lumaring Kelurahan Larompong dengan bemuara di Teluk Bone. Debit Sungainya cenderung besar dan rawan banjir pada saat curah hujan tinggi dengan kondisi penampang sungai saat ini seringkali meluap mengakibat bencana terutama disekitar sungai utama. Untuk mengkaji permasalahan banjir tersebut, dilakukan kajian pengaliran sungai terhadap koefisien kekasaran Manning. Tujuan penelitian adalah untuk mengetahui debit banjir kala ulang berapa yang menyebabkan luapan banjir dari kondisi penampang sungai saat ini serta untuk mengetahui pengaruh nilai koefisien kekasaran manning terhadap muka air banjir yang terjadi dan membandingkannya dengan data sekunder. Penelitian ini dilaksanakan selama tiga bulan yaitu bulan September-Desember 2019. Variabel yang diamati dan dihitung yaitu debit banjir kala ulang, deskripsi karakteristik kekasaran penampang sungai. Metode yang digunakan adalah metode survei dan penentuan titik pengukuran dan pengamatan berdasarkan pertimbangan tertentu. Data dianalisis dengan bantuan software HEC-RAS.
Pengaruh Perlakuan PWHT terhadap Sifat Mekanis Sambungan Las TIG pada Baja Grade 91 Halman; Ramly, Ismail; Fauzi, Yusuf Rizal
Journal of Energy, Materials, & Manufacturing Technology Vol 4 No 02 (2025): Journal of Energy, Materials, & Manufacturing Technology
Publisher : Unit Penelitian, dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61844/jemmtec.v4i02.1064

Abstract

Grade 91 steel is a high-alloy steel widely used in power and petrochemical industries due to its resistance to high temperatures, oxidation, and corrosion. However, welding this steel requires post-weld heat treatment (PWHT) to reduce residual stresses and enhance toughness. This study analyzes the effect of varying PWHT holding times (0, 4, 8, and 12 hours) on the mechanical properties of TIG-welded Grade 91 steel using ER90S-B9 filler metal. Tensile and hardness tests were conducted to evaluate changes in strength and material resistance due to heat treatment. The results indicate that without PWHT, the heat-affected zone (HAZ) experiences a significant increase in hardness due to martensitic formation, which the risk of cracking and brittleness. Applying PWHT with a longer holding time effectively reduces hardness in the HAZ and weld zone, improving material toughness. However, excessive PWHT duration may lead to a reduction in tensile strength. Therefore, selecting optimal PWHT parameters is crucial to ensuring the reliability of welded structures in industrial applications.
Co-Authors Fauzi, Yusuf Rizal Hanafi Ashad Ramly, Ismail