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All Journal Jurnal Elementer (Elektro dan Mesin Terapan) MACHINERY: Jurnal Teknologi Terapan
Toni Okviyanto
Politeknik Negeri Sriwjaya
Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Sifat Mekanik Baja Karbon ST 37 Pada Variasi Kuat Arus dan Sudut Kampuh SMAW : Analisis Sifat Mekanik Baja Karbon ST 37 Pada Variasi Kuat Arus dan Sudut Kampuh SMAW Dibyo Setiawan -; Sutrimo; Gugun Nugraha; Hanni Maksum Ardi; Toni Okviyanto
Jurnal Elektro dan Mesin Terapan Vol. 9 No. 1 (2023): Jurnal Elektro dan Mesin Terapan (ELEMENTER)
Publisher : Politeknik Caltex Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35143/elementer.v9i1.5886

Abstract

This study discusses the impact of variations in the seam angle of welded joints and welding parameters on the tensile strength and hardness testing of ST 37 carbon steel. The SMAW welding process is one of the metal connection techniques used in industry. The method of welding joints is carried out with variations in the seam angle of the welded joints 600 and 700, while variations in the current strength of the welded joints are 90A, 100A, and 110A. The experimental method used in this research is the steel base metal material ST 37, which has a thickness of 8 mm. The tensile strength test results have the highest value at the seam angle of 700 with a current strength of 110 A, namely 482.54 N/mm2. The lowest tensile strength test results were obtained with a tensile strength of 399.54 N/mm2 at a welded angle of 700 and a current strength of 90 A. The test specimen with a variation of the existing power of 110 A and a weld seam angle of 700 has the highest value in the hardness test with a 234 HV hardness.
ANALISIS STRUKTUR MIKRO TERHADAP HASIL EKPERIMENTAL SAMBUNGAN LAS SMAW PADA BAJA KARBON ST 37 Toni Okviyanto; Dibyo Setiawan; Gugun Nugraha; Sutrimo; Destri Muliastri
MACHINERY: Jurnal Teknologi Terapan Vol. 4 No. 2 (2023): Machinery:04022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8049215

Abstract

Welding is a process of joining two or more metals using thermal energy to melt them. The thermal processes of welded joints affect the phase change and the physical, microstructural, and mechanical properties of the weld. The purpose of the activity, to analyze the results of SMAW welded joints, parameters of current strength, and seam angle of the ST 37 carbon steel microstructure is a continuation of previous publication activities. Variation of the current strength of 90 A, 100 A, 110 A and seam angles of 600 and 700 with electrodes Ø2.6 mm and Ø3.2 mm. During the welding process, a series of thermal cycles of the weld metal and HAZ occur, from thermalization to maximum temperature and then undergoing a cooling process. The final composition of the weld metal, filler metal, and the condition of the air in the weld area are factors for the formation of the microstructure. Microstructures such as acicular ferrite can improve the mechanical properties of the weld metal. Visualization of the microstructure using an optical microscope during the metallographic inspection process was carried out by observing the grain size and phase formed on the base metal, heat-affected zone (HAZ), fusion line (FL), and weld metal (WL). The results showed that the weld metal (WM) with a series of experiments tended to have a larger acicular ferrite structure. The conclusion of the microstructural analysis is that the greater the current strength and seam angle, the more acicular ferrite structures are formed.
ANALISIS PENGARUH TOTAL DRY SOLID BLACK LIQUOR TERHADAP EFISIENSI RECOVERY BOILER Herlin Sumarna; Baiti Hidayati; Tri Satya Ramadhoni; Toni Okviyanto; Zainuri Anwar; Ahmad Imam Rifa’i
MACHINERY: Jurnal Teknologi Terapan Vol. 4 No. 2 (2023): Machinery:04022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8085820

Abstract

In the pulp and paper industry, a large amount of biomass (wood) has been used and produces by-products or residues resulting from the industry including wood bark, remaining logging and black liquor which is one of the main biomass resources that can be used for energy purposes. Aside from being a fuel, the recovery boiler process can convert black liquor into green liquor, where green liquor will be needed in the pulp production process. Writing this journal aims to determine the effect of total dry solids in black liquor on the efficiency of recovery boilers. The analysis was carried out using energy calculations in the recovery boiler for five days. From the calculation results it is known that there is a decrease and increase in boiler recovery efficiency, this is caused by several factors, including the heat absorption process experienced by the boiler feed water, the mass of black liquor, and the percentage of total dry solids. The total dry solid will affect the water content that will enter the combustion chamber, the higher the % TDS the more water content will enter the combustion chamber and this will affect the recovery efficiency of the boiler. The highest boiler recovery efficiency calculation results occurred on the first day, namely 65.24% and the lowest boiler recovery efficiency calculation results occurred on the fourth day, namely 62.96%.
Co-Authors Ahmad Imam Rifa’i Baiti Hidayati Destri Muliastri Dibyo Setiawan Gugun Nugraha Gugun Nugraha Hanni Maksum Ardi Herlin Sumarna Sutrimo Sutrimo Tri Satya Ramadhoni Zainuri Anwar