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I Wayan Suma Wibawa
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Automotive Engineering Energy Engineering Mechanical Engineering

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Pengaruh Arus Listrik Spot Welding KW14-1031 Terhadap Kekuatan Geser Pada Baja St42 I Wayan Suma Wibawa; I Made Anom Adiaksa; Made Ardikosa Satrya Wibawa; A.A. Gede Pradnyana Diputra; I Komang Kantun; I Nyoman Suparta
Journal of Applied Mechanical Engineering and Green Technology Vol. 4 No. 1 (2026): April
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v4i1.14-19

Abstract

Welding technology serves not only as a manufacturing process but also as a repair solution for all metal-based components. Spot welding is a welding method that utilizes electrical resistance to join various products made of sheet metal, in which the contacting metal surfaces are fused by the heat generated from electrical resistance. This welding method is selected due to several advantages, including ease of operation without requiring specialized skills as demanded by other welding techniques, as well as a faster process that enhances production time efficiency. Control of the electrical current path during welding is critical, as it significantly influences the characteristics of the joint, including weld quality, shear strength, hardness level, and resistance to external loads. This study focuses on analyzing the effect of electrical current in spot welding techniques on the shear strength of ST 42 steel plates. Through descriptive analysis and graphical representation, this research aims to observe the relationship between electrical current and the resulting shear strength produced by the welding process. The lowest average shear strength was recorded at an input current of 20.36 A with a welding output current of 6011.47 A, a welding time of 8 seconds, and a heat input of 61894.30 J, yielding a shear strength of 1.67 MPa. Meanwhile, the highest average shear strength was obtained at an input current of 28.95 A with a welding output current of 6011.47 A, a welding time of 8 seconds, and a heat input of 88007.92 J, resulting in a shear strength of 6.72 MPa. Electrical current control is therefore essential, as ST 42 steel plates experienced damage at an input current of 32.45 A and an output current of 6323.58 A, with a welding time of 8 seconds and a heat input of 98647.84 J.
A Analisa Alat Tanam Padi Dengan Sistem Gerak Putaran: Analysis of Rice Planting Tools with Rotary Motion System Satrya Wibawa, Made Ardikosa; Anak Agung Gede Pradnyana Diputra; I Wayan Suma Wibawa; I Wayan Marlon Managi; I Nyoman Suparta; I Ketut Suherman
Journal of Applied Mechanical Engineering and Green Technology Vol. 4 No. 1 (2026): April
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v4i1.1-7

Abstract

This study aims to design and develop a circular motion rice planting tool with high efficiency and effectiveness, particularly for narrow rice fields commonly found in Bali. The developed tool features a stainless steel frame, a manual drive system using a rotating spindle, a chain and sprocket transmission system, and a planting mechanism consisting of a main shaft equipped with a mechanical seedling clamp. The tool is ergonomically designed to reduce farmers’ physical workload and simplify maintenance, as it does not require additional energy sources such as fuel or electricity. Performance testing was conducted directly in rice fields located in Subak Ulun Suwi, Gianyar Regency. The testing method compared the time required for rice planting using traditional manual methods and the developed tool. Observation parameters included working time, ease of operation, labor requirements, and consistency of seedling planting results. The results showed that the circular motion rice planting tool significantly improved time efficiency. The average planting time decreased from about 24 minutes per 100 m² using manual methods to approximately 13 minutes per 100 m² using the tool, indicating a time efficiency improvement of nearly 50%. Additionally, the tool reduced farmers’ physical strain because the planting process no longer required prolonged bending. However, some technical challenges were still identified, particularly related to inconsistent numbers of seedlings planted at certain field points. These issues were influenced by variations in mud field conditions, differences in seedling size, and the stability of the clamping mechanism during operation. Overall, the circular motion rice planting tool shows strong potential to improve productivity and planting efficiency, especially in narrow and terraced rice fields. Further development is needed to enhance planting mechanism stability and ensure consistent seedling placement, enabling the tool to become an affordable and practical agricultural mechanization solution suitable for Bali.
Evaluasi Kinerja dan Efektivitas CVT sebagai Sistem Transmisi pada Kendaraan Buggy 2WD I Wayan Agus Rantia Dana; I Made Anom Adiaksa; I Wayan Suma Wibawa; I Made Bagus Panji Aditya
Journal of Applied Mechanical Engineering and Green Technology Vol. 4 No. 1 (2026): April
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v4i1.33-39

Abstract

The development of non-conventional light vehicle technology, such as the buggy car, demands efficient and reliable power transfer systems to support mobility in congested industrial areas. One of the primary technologies utilized is the continuously variable transmission (cvt), which offers the advantage of changing transmission ratios continuously without the interruptions found in conventional gear shifting. However, in its application, an imbalance often occurs between the engine speed (rpm engine) and the wheel speed (rpm wheel) due to load factors and power losses. This study aims to comprehensively analyze the correlation between rpm engine and wheel performance on a buggy vehicle under varying loads ranging from 3 kg to 8 kg. Experimental results indicate that increasing the load leads to a significant decrease in wheel rpm across all engine speed ranges; for instance, at 8000 rpm engine, the wheel rpm dropped from approximately 515 rpm (3 kg load) to 225 rpm (8 kg load). Conversely, wheel torque exhibited a linear increase as the load rose, reaching a peak value of 15.8 nm at an 8 kg load. effectiveness analysis shows that the output power (hp) tends to increase with the load, with the highest effectiveness achieved during lower engine speed operations (5500 rpm) at peak load. These findings provide a scientific contribution to understanding the mechanical behavior of cvts and serve as a technical reference for optimizing transmission tuning in light vehicles to achieve a balance between torque and power efficiency.
Co-Authors A.A. Gede Pradnyana Diputra Anak Agung Gede Pradnyana Diputra I Ketut Suherman I Komang Kantun I Made Anom Adiaksa I Made Bagus Panji Aditya I Nyoman Suparta I Wayan Agus Rantia Dana I Wayan Marlon Managi Made Ardikosa satrya Wibawa Satrya Wibawa, Made Ardikosa