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All Journal MACHINERY: Jurnal Teknologi Terapan Journal Serambi Engineering (JSE)
M. Rasid
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Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Variasi Pukulan terhadap Kekerasan Baja menggunakan Mesin Hammer Otomatis Kiki Qauri Valentino; M. Rasid; Dwi Arnoldi
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

This study evaluates the effect of varying hammer strokes during the forging process using an automatic hammer machine on the hardness of ST 37 steel, ST 60 steel and automotive leaf springs. The experiments were carried out at a temperature of 600°C to analyse dimensional changes and material hardness resulting from plastic deformation. Data was obtained from thickness and hardness tests using the Vickers method. Variations in hammer strokes (0, 32 and 49 strokes) resulted in a significant increase in material hardness. For ST 37 steel the hardness increased from 137,964 kgf/mm² to 170,088 kgf/mm², for ST 60 steel from 158,781 kgf/mm² to 172,56 kgf/mm² and for automotive leaf springs from 198,442 kgf/mm² to 241,756 kgf/mm². This improvement is attributed to the strain hardening mechanism, which induces the accumulation of dislocations in the microstructure of the material, thereby increasing its resistance to further deformation. The variation in hammer strokes also influenced the changes in material thickness, with different levels of deformation depending on the mechanical properties of each material. ST 60 steel showed a more controlled deformation response compared to ST 37 steel, while automotive leaf springs showed greater deformation due to their more ductile nature. These results emphasise that forging process parameters, such as the number of hammer strokes, play a crucial role in enhancing the mechanical properties of materials to meet specific engineering application requirements.
ANALISA KEBOCORAN SAMBUNGAN LAS PIPA SANITARY SS 316L YANG DI RENDAM DALAM LARUTAN PH 4 Oktariady, Muhammad; M. Rasid; Ella Sundari
MACHINERY Jurnal Teknologi Terapan Vol. 6 No. 3 (2025): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/machinery.v6i3.10569

Abstract

This study aims to analyze the cause of leakage in SS 316L sanitary pipes used for food additive distribution. The leakage is suspected to be caused by corrosion due to exposure to the acidic environment. The research was conducted experimentally using 12 samples subjected to different treatments: no welding, argon welding, and electric welding using NSN-309L/E 309-16 and NSN-316/E 309-16 electrodes. All samples were immersed for 24 hours in a pH 4 solution and tested using the gravimetric method to measure mass loss due to erosion. The results showed that pH 4 acid solution significantly caused mass reduction in the pipes, with the highest erosion occurring in electric welding joints. The highest erosion percentage, 2.99%, was found in samples welded with NSN-309L/E 309-16 electrodes, while unwelded samples experienced only 0.21% erosion. The validity of the data was tested and confirmed based on the comparison between the calculated r-value and the critical r-table value. The conclusion indicates that the welding method influences the pipe’s susceptibility to corrosion, with electric welding posing a higher risk than argon welding in acidic environments.
Co-Authors DWI ARNOLDI Ella Sundari Kiki Qauri Valentino Oktariady, Muhammad