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Devina Rosa
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Automotive Engineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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ANALISIS PENGUJIAN KEKUATAN TARIK DAN UJI KEKERASAN TERHADAP PENGELASAN GTAW PADA SAMBUNGAN KAMPUH MODEL V DENGAN VARIASI MEDIA PENDINGIN PADA BAJA ST 45: ANALYSIS OF TENSILE STRENGTH TESTING AND HARDNESS TEST ON GTAW WELDING TO MODEL V CLAMP JOINTS WITH VARIATIONS OF COOLING MEDIA ON ST 45 STEEL Maulana Ahmad Ali Akbar; Khalida, Zulfa; Devina Rosa; Alfian Hudan
Jurnal Teknik Mesin Vol. 4 No. 2 (2025): JURNAL TEKNIK MESIN
Publisher : Program Studi Teknik Mesin PSDKU Polinema Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/j-meeg.v4i2.8202

Abstract

In the welding process it will produce excessive heat and in the slow cooling process it will form chromium carbide which precipitates on the grain. These deposits can cause a decrease in the physical and mechanical properties of a material. This research aims to determine the effect of tensile strength and hardness of material resulting from GTAW welding on ST 45 Steel on variations in cooling media. The research method used is quantitative experimental, where the specimens are welded and cooled with three cooling media, then tested for tensile and Vickers hardness to evaluate their mechanical properties. The results showed that the SAE 20 W-50 oil cooling media produced the highest Modulus Young value (average 1584.60 MPa) and the highest Vickers hardness (459.33 HVN), while air provided a higher Yield Strenght (368.72 MPa). Statistical analysis using ANOVA confirmed that the differences were statistically significant. The conclusion of this research shows that SAE 20 W-50 oil is most effective in increasing material hardness and stiffness, while air is superior in increasing tensile strength.
ANALISIS PERAWATAN MESIN CNC YUNAN TOOL WORKS DENGAN METODE RCM PADA PT WILIS INDONESIA STEEL : ANALYSIS OF YUNAN TOOL WORKS CNC MACHINE MAINTENANCE USING THE RCM METHOD AT PT WILIS INDONESIA STEEL Hartono, Farrel; Saiful Arif; Devina Rosa
Jurnal Teknik Mesin Vol. 4 No. 2 (2025): JURNAL TEKNIK MESIN
Publisher : Program Studi Teknik Mesin PSDKU Polinema Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/j-meeg.v4i2.8273

Abstract

This study analyzes the maintenance of the CY-K510N CNC machine at PT Wilis Indonesia Steel using the Reliability Centered Maintenance (RCM) method. The main issue identified is high downtime, primarily caused by repeated failures of the servo motor, which recorded 15 breakdowns and a total downtime of 218 hours in 2023. The RCM approach was chosen because it can identify critical components and develop maintenance strategies based on function and failure risk, unlike conventional preventive methods that rely only on fixed schedules. The Failure Mode and Effect Analysis (FMEA) results show that the servo motor and gear spindle are the most critical components with the highest risk values. Implementing the RCM strategy is recommended to improve machine reliability, reduce breakdown frequency, and enhance overall productivity.
ANALISIS PENGARUH VARIASI TEGANGAN PADA METODE ANODIZING TERHADAP KETAHANAN KOROSI DAN KEKERASAN PERMUKAAN ALUMUNIUM TIPE SERI 6061: ANALYSIS OF THE EFFECT OF VOLTAGE VARIATIONS IN THE ANODIZING PROCESS ON THE CORROSION RESISTANCE AND SURFACE HARDNESS OF 6061 SERIES ALUMINUM huda, aziz; KHALIDA, ZULFA; Devina Rosa
Jurnal Teknik Mesin Vol. 4 No. 2 (2025): JURNAL TEKNIK MESIN
Publisher : Program Studi Teknik Mesin PSDKU Polinema Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/j-meeg.v4i2.8560

Abstract

Aluminum 6061 is susceptible to corrosion in aggressive environments despite its natural corrosion resistance. Anodizing effectively improves corrosion resistance and hardness; however, the effect of voltage variation requires further analysis. Research using voltages of 9V, 10V, 11V, and 12V showed that 10V resulted in the lowest corrosion current (1.456 × 10⁻⁸ A) and the highest polarization resistance 7,1474 × 10⁶, indicating optimal corrosion resistance. Hardness increased with voltage, reaching 49 HB at 12V. Voltage variation had a significant effect, with 10V being optimal for corrosion resistance and 12V for maximum hardness. This research are relevant for industries requiring a combination of high corrosion resistance and mechanical strength.
Co-Authors Alfian Hudan Hartono, Farrel huda, aziz Maulana Ahmad Ali Akbar Saiful Arif Zulfa Khalida