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All Journal Transmisi Indonesian Journal of Electrical Engineering and Computer Science Jurnal Polimesin
Jumiadi, Jumiadi
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Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH TEMPERATUR SINTERING TERHADAP DENSITAS DAN POROSITAS KOMPOSIT LOGAM (Al-SiC) HASIL PROSES METALURGI SERBUK Pramono, Agus; Jumiadi, Jumiadi
TRANSMISI Vol 7, No 1 (2011): Edisi Pebruari 2011
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v7i1.4566

Abstract

Pembuatan komposit matrik logam paduan Al-SiC telah banyak dilakukan oleh para peneliti melalui teknikmetalurgi serbuk. Alasan penelitian bidang metal matrix composite dengan sistem metalurgi serbuk adalahkarena memungkinkan tercampurnya penguat secara baik dan merata. Komposit matrik logam Al-SiCmerupakan bahan paduan dari jenis material yang berbeda, sebagai matrik dalam hal ini adalah aluminiumdan sebagai penguatnya adalah partikel SiC (keramik) yang dibuat dengan teknik metalurgi serbuk. Padapenelitian ini, komposit Al-SiC dengan variasi temperatur sinter 450oC, 500oC dan 550oC, dengan tekanan1900 Psi dan lama penahanan 60 menit. Pengujian meliputi uji densitas dan uji porositas. Hasil penelitianmenunjukan bahwa temperatur sintering berpengaruh terhadap densitas dan porositas dari produk kompositAl-SiC.
Analysis of The Effect of Post Weld Heat Treatment (PWHT) on The Hardness and Corrosion Rate of SMAW Welded Joints on AISI 304 Plates Diantoro, Helga; Jumiadi, Jumiadi; Widyastuti, Ike
TRANSMISI Vol 20, No 1 (2024): March 2024
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v20i1.12716

Abstract

Post-welding heat treatment (PWHT) is a heat treatment of steel that has undergone welding. The purpose of doing PWHT is to improve the properties of the material itself. Such as uniforming the microstructure, reducing residual stresses, and improving corrosion resistance. In this study the authors conducted a shielded arc welding (SMAW) welding experiment on an AISI 304 steel pelate which had a thickness of 8 mm, a width of 150 mm, and a length of 200 mm. AISI 304 is a type of austenitic stainless steel. The type of seam used is the v seam with an angle of 60˚ and a root face of 2 mm. As for the welding process, it was carried out in the 1G position, using an E308S-15 electrode with a diameter of 2 mm, and a current of 60 A. From the welding carried out on the AISI 304 pelate, then cuts were made to divide the steel into 10 specimens, with a width of 10 mm, a thickness of 8 mm, and 60 mm long. PWHT was carried out with temperature variations of 1100˚C, 900˚C and 700˚C for 15 minutes, and cooled using water as the medium. Conclusions that can be drawn from this research, among others; (1) From the PWHT process carried out at temperatures of 1100˚C, 900˚C and 700˚C. Temperature of 1100˚C can reduce carbide deposition in the weld metal, HAZ and base metal areas, (2) The highest level of hardness occurs in the weld metal area without PWHT of 111.7 HRB, while the lowest hardness level occurs in the HAZ area with PWHT of 1100˚C as big as 95.6 HRB. (3) The highest corrosion rate occurred at PWHT 700˚C of 0.429 mm/y, while the lowest corrosion rate occurred at PWHT 1100˚C of 0.073 mm/y.
Optimizing stress resistance in MEMS inertial sensors through material and thickness variations Aziza, Miladina Rizka; Setyawati, Onny; Jumiadi, Jumiadi
Indonesian Journal of Electrical Engineering and Computer Science Vol 39, No 1: July 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v39.i1.pp110-117

Abstract

Stress on the micro-electromechnical system (MEMS) sensors significantly decreases sensor accuracy. Thermomechanical stresses induced by the packaging assembly process and external loads during operation induce a shift in the output signal (offset) of MEMS sensors. To achieve high precision in accelerometers, gyroscopes, and other MEMS devices, it is crucial to employ advanced modeling and simulation techniques to mitigate stress-induced offset drift. Therefore, this paper aims to explore and simulate stress on inertial sensors by designing a gyroscope tuning fork with a perforated proof mass to reduce the damping effect. Our findings provide insights for decreasing stress by varying the material and thickness of the inertial sensor. The least stress was obtained from an inertial silicon sensor with 5 and 20 mm thicknesses.
Effect of seawater flow velocity in South Malang on the corrosion rate of low carbon steel with a corrosion coupon rack Suprapto, Agus; Irwandi, Jul Viansyah Dwiki; Jumiadi, Jumiadi; Tsamroh, Dewi Izzatus
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4897

Abstract

Corrosion is a phenomenon of damage to metal that can be influenced by several factors, including environmental factors, namely pH, humidity, temperature, and impurity factors. Corrosion that occurs due to the flow of a fluid is known as erosion corrosion. One type of metal that is susceptible to corrosion is carbon steel. Carbon steel material is very commonly used in the industrial world. An application of carbon steel is in piping systems that transport fluids; thus, fluid flow velocity affects the corrosion resistance of carbon steel. This research aimed to determine the effect of seawater flow on the corrosion rate of low carbon steel (ST 37) with variations in seawater velocity. This research is a type of laboratory-scale experimental research using coupon rack corrosion test equipment. The variations in seawater velocity used are 0 L/min, 15 L/min, 20 L/min, and 25 L/min. Observations of each experiment were carried out every 6 and 12 hours. The corrosion rate was analyzed using the weight loss method, namely by calculating the initial and final weight of the specimen before and after the experiment. The results show that increasing seawater flow velocity also increases the corrosion rate on steel specimens, with the lowest corrosion rate at 10.262 mpy on specimens with a variation of 0 L/min, while the highest corrosion rate is 48.743 mpy on specimens with a variation of 25 L/min. It can be concluded that the velocity of the fluid flow and the type of particles contained in the flow affect the rate of erosion-corrosion. The higher the fluid flow velocity and the more abrasive the particles contained in the flow, the faster the rate of erosion-corrosion.
Co-Authors Agus Pramono Agus Suprapto Andrijono, Djoko Aziza, Miladina Rizka Dewi Izzatus Tsamroh Diantoro, Helga Irwandi, Jul Viansyah Dwiki Onny Setyawati Widyastuti, Ike