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All Journal Jurnal technoscientia Jurnal Teknologi Jurnal Pengabdian Masyarakat AbdiMas JURNAL TEKNOLOGI TECHNOSCIENTIA
Agus Duniawan, Agus
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Jurnal technoscientia

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PENGARUH KECEPATAN ARUS PENGELASAN DAN PANAS MASUK TERHADAP SIFAT MEKANIS LOGAM LAS PADA PENGELASAN SAW BAJA KARBON ASTM A 29 Duniawan, Agus; -, Sutrimo
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 1 Agustus 2014
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (844.964 KB) | DOI: 10.34151/technoscientia.v7i1.581

Abstract

Welding is a joining technique in production process which weld two metals or more using heat energy Physical property near welding zone changes in microstructure, deformation and thermal stress in order to minimize a negative effects, it is required a correct procedure in welding, selection of optimum welding current and heat input. Welding joint in steel countruction or pressure vessel has to fullfill the welding standard such as, high stress property 27 joule for temperature – 50oC and 100 joule for 0oC. The aim of this research is to investigate the Effect of variation in welding current, welding speed and heat input on microstructure of main metal and HAZ. Experimental work is done using optic microscope, hardness test and univercal machine. The purpose of the research is to obtain optimum welding parameter related which micro structure and mechanical properties of weld metal and HAZ. The variation in heat input are 2 kg/mm, 3kg/mm, 4kg/mm. The variation of welding speed are 7 mm/s, 4,7 mm/s and 3,5 mm/s at current of 400 Ampere,mean while at 600 Ampere the variation in welding speed are 10,5mm/s, 7mm/s, 5,25mm/s. The result shaws that microstructure is dominated by ferit size and ferit Widmanstatten. The highest hardness of 164,98 VHN is found at welding zone of specimen A with welding current of 400 Amper, welding speet of 7 mm/s and heat input of 2kg/mm. Tension and yielding stress of 567 and 472 MP occur for specimen A1 with 600 Ampere welding speed of 7 mm/s and heat input of 2kg/mm.
PENENTUAN WAKTU OPERASIONAL UPS PADA SISTEM CATU DAYA OTOMATIS TRANSISI PLN-GENSET Pambudi, Prastyono Eko; Duniawan, Agus; Fahmi, Samsuhadi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 12 No 1 Agustus 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (698.856 KB) | DOI: 10.34151/technoscientia.v12i1.1742

Abstract

PLN main source of power supply from PLN is very influential on electricity supply for the community. Electrical energy from PLN sometimes often occur blackouts. The need for reliable power supply is indispensable to residential consumers, especially in home industries. From these problems, this research is conducted to realize the control system used to transition the power supply with the main power supply from PLN and backup power supply from Uninterruptible power supply (UPS) and Genset. This study produces an automatic power supply transition which has two backup power supplies in the form of UPS and Genset. From the analysis of residential houses that have PLN 450 VA subscription, the system will work with a 12 Volt UPS battery at a current capacity of 28,125 A, and a capacity of Genset 800 VA. The automatic power supply transition system will instruct the UPS power supply to be connected when the PLN main supply is disconnected, after a UPS battery low will command the Genset for the starter, and when the generator is in stable condition the power supply will switch to the power supply Genset. At the time of PLN power supply source again available load will be transferred system to PLN source.
Co-Authors -, Sutrimo -, Sutrimo Adi Purwanto Fahmi, Samsuhadi Hary Wibowo, Hary Prastyono Eko Pambudi Toto Rusianto