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All Journal Jurnal Polimesin Recent in Engineering Science and Technology
Vina Nanda Garjati
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis of the effect of welding sequence and speed on the distortion of ASTM A36 joints by MIG method Dewin Purnama; Vika Rizkia; Vina Nanda Garjati
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4134

Abstract

The welding process with the Metal Inert Gas (MIG) method often produces distortions that are detrimental to product quality, one of the factors that affect the characteristics of the welding results is heat input. The heat input provided in the welding process is influenced by arc current, arc voltage, and welding speed, besides that the welding sequence can also affect the distortion of thin plates due to welding on materials such as ASTM A36 plates. The welding process uses welding wire/electrode type AWS ER 70S-6 with a diameter of 1.0 mm, the welding parameters applied are: voltage of 22 Volts, current of 150 Amperes, DC + Current type (DCEP), the shielding gas used is 100% Argon with a flow rate of 15 liters per minute, horizontal welding position (1G), the amount of heat input is differentiated by changing the welding speed and the welding sequence used is the stepping stone method. The results of the study using ANOVA indicate that welding distortion increases with an increase in input heat, the repetition of welding sequences leads to greater distortion due to thermal stress, and the welding sequence and input heat have an influence of 80.4% in reducing distortion.
Enhancing Proton Exchange Membrane Fuel Cell (PEMFC) Performance through Optimized Design of Parallel Channel Bipolar Plates Moh Nurkhamal; Rizkia, Vika; Vina Nanda Garjati; Radhi Maladzi
Recent in Engineering Science and Technology Vol. 3 No. 01 (2025): RiESTech Volume 03 No. 01 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i01.94

Abstract

In this modern era, the demand for efficient and environmentally friendly energy sources is increasing. One technology with significant potential to meet this demand is the Proton Exchange Membrane Fuel Cell (PEMFC). This study aims to investigate the influence of channel width and depth variations in parallel bipolar plate designs on PEMFC performance. Computational Fluid Dynamics (CFD) was employed to analyze hydrogen flow distribution and pressure across various design variations. The results demonstrate that channel width and depth significantly affect pressure distribution and flow velocity, which in turn influence the efficiency of the PEMFC system. Increasing channel width generally reduces maximum pressure, while deeper channels help to distribute pressure more evenly across the bipolar plate. Optimized channel width and depth can enhance PEMFC operational performance by reducing pressure drop and promoting uniform flow distribution.
Co-Authors Dewin Purnama Moh Nurkhamal Radhi Maladzi Vika Rizkia