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I Wayan Marlon Managi
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Automotive Engineering Energy Engineering Mechanical Engineering

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Analisis Pengaruh Aliran Fluida Pendingin Dan Waktu Pengelasan Spot Welding Kw14-1031 Terhadap Kekuatan Tarik Pelat Baja ST 40 Adiaksa, I Made Anom; I Nyoman Gede Suta Waisnawa; Ida Bagus Gde Widiantara; I Wayan Marlon Managi
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.v4i1.8-13

Abstract

Spot welding is greatly influenced by the cooling medium in terms of welding characteristics such as strength. The tensile strength of ST 40 steel plate welded joints is influenced by the cooling medium and welding time. Testing and data collection use experimental methods on spot welding machines and shear tests. Data collection uses quantitative methods while processing uses descriptive methods. The ASTM E8 standard is used in sample testing. The flow of coolant fluid in the spotwelding process significantly affects the HAZ diameter. Faster fluid flow increases heat transfer from the electrode to the coolant, keeping the electrode and weld material temperatures below 1,500 ºC, thereby reducing electrode wear and maintaining a stable weld nugget size at 5.00 mm. The lowest HAZ diameter was recorded at a flow rate of 5 liters/minute with a HAZ diameter of 8.30 mm, while the highest was at a flow rate of 2 liters/minute with a diameter of 10.43 mm. Too fast cooling or too short welding time can cause brittle weld joints and reduce tensile stress. Conversely, slower cooling with appropriate welding time produces optimal tensile strength while maintaining the structural integrity of the joint. Optimal results were found at a fluid flow rate of 2 liters/minute at 5.0 seconds with a tensile stress of 96.10 MPa, 3 liters/minute at 6.0 seconds with a tensile stress of 104.89 MPa, 4 liters/minute at 7.0 seconds with a tensile stress of 114.00 MPa and 5 liters/minute at 8.0 and 9.0 seconds with tensile stress of 116.72 MPa and 125.76 MPa.
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.
Co-Authors Anak Agung Gede Pradnyana Diputra I Ketut Suherman I Made Anom Adiaksa I Nyoman Gede Suta Waisnawa I Nyoman Suparta I Wayan Suma Wibawa Ida Bagus Gde Widiantara Satrya Wibawa, Made Ardikosa