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Wahyudianto, FX. Arif
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Computer Science & IT Mechanical Engineering

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Eksperimental Perilaku Penguapan Aquadest dengan Penambahan Oleoresin Keruing sebagai Inhibitor Alami Dianto, Wahyu; Wahyudianto, FX. Arif; Suprihanto, Agus; Rusman, Rusman; Patayang, Mika
Simetris: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer Vol. 16 No. 2 (2025): JURNAL SIMETRIS VOLUME 16 NO 2 TAHUN 2025
Publisher : Fakultas Teknik Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/simet.v16i2.15902

Abstract

Air suling (aquadest) kerap digunakan sebagai fluida pendingin, tetapi kelemahannya adalah memiliki tingkat penguapan yang relatif tinggi. Penelitian ini difokuskan untuk mengevaluasi karakteristik penguapan aquadest yang dimodifikasi dengan penambahan oleoresin keruing sebagai inhibitor alami pada variasi konsentrasi 1%, 3%, dan 5%. Metode yang digunakan bersifat eksperimental, meliputi pengukuran perbedaan massa awal–akhir, pencatatan data termal selama proses pemanasan dan pendinginan, serta perhitungan laju penguapan. Hasil pengujian memperlihatkan bahwa penambahan oleoresin keruing mampu menekan laju penguapan dibandingkan aquadest murni. Di antara variasi yang diuji, konsentrasi 1% menunjukkan kinerja paling optimal dengan stabilitas termal yang baik dan tingkat penguapan lebih rendah. Temuan ini menegaskan bahwa oleoresin keruing berpotensi menjadi inhibitor alami yang ramah lingkungan untuk aplikasi cairan pendingin radiator, serta memberikan kontribusi terhadap pengembangan coolant yang berorientasi eco-friendly.
Optimisation of Preheating Temperature for Mechanical Performance of SMAW Welded ASTM A36 Steel Sumarji, Sumarji; Hariyanto, Agus; Wahyudianto, FX. Arif; Suprihanto, Agus
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7356

Abstract

The Shielded Metal Arc Welding (SMAW) process applied to ASTM A36 structural steel generates thermal cycles that influence the mechanical behaviour of welded joints. This study investigates the effect of preheating temperature on tensile properties and hardness distribution of SMAW-welded ASTM A36 steel plates with a thickness of 10 mm. Preheating temperatures of none, 150 °C, 250 °C, and 350 °C were applied prior to welding in the 1G position using AWS A5.1 E7016 and E7018 electrodes. Tensile testing was conducted according to ASTM E8, while Vickers hardness measurements were performed across the base metal (BM), heat-affected zone (HAZ), and weld metal (WM). The results show a consistent hardness distribution of WM > HAZ > BM for all preheating conditions, with average hardness values ranging from 190–210 HV in the WM, 179–186 HV in the HAZ, and 164–173 HV in the BM. The yield strength increased from 301.69 MPa (without preheating) to 315.68 MPa at 250 °C, followed by a decrease to 298.70 MPa at 350 °C, which is associated with microstructural softening. In contrast, the ultimate tensile strength remained relatively stable within the range of 443–446 MPa. Based on these results, preheating at 250 °C tends to provide a more homogeneous hardness distribution and higher yield strength, suggesting a more favourable thermal condition for improving the mechanical performance of SMAW-welded ASTM A36 steel. .
Co-Authors Agus Hariyanto Agus Suprihanto Dianto, Wahyu Mika Patayang, Mika Rusman Rusman Sumarji