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All Journal Mechanical Engineering for Society and Industry Journal of Sustainability Perspectives Prosiding SNTTM Journal of Automotive and Mechanical Applied Technology
Gandjar Kiswanto
Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Effect of deposition current on bead geometry characteristics of low carbon steel single wall structure fabricated by wire arc additive manufacturing Danny Wicaksono; Ario Sunar Baskoro; Nicholas Ego Guarsa; Gandjar Kiswanto; Syarif Junaidi
Mechanical Engineering for Society and Industry Vol 5 No 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.14623

Abstract

Wire arc additive manufacturing (WAAM) is gaining popularity due to its ability to produce large metal parts quickly and efficiently. It produces less waste and has a more efficient production time than subtractive manufacturing. However, those capabilities come with unavoidable disadvantages, post-processing by machining becomes necessary to achieve the desired product dimension. Therefore, this research aimed to evaluate the bead geometry and utilization area of the WAAM-fabricated structure by varying the deposition current. The wall-structured specimens were fabricated using gas metal arc welding (GMAW) with motorized drivers for x, y, and z coordinates. The material used in this research was low carbon steel ER70S-6 filler metal with ASTM A36 low carbon steel substrate. The Varying parameter was deposition current with other related process parameters remaining constant. Material testing and characterization techniques included geometric measurement by profile projector plotted into a scattered diagram, and the cross section of the specimens were observed using a digital microscope. The experiment resulted in increased bead dimension in width and height along with increased deposition current. The largest bead dimension was achieved in 180A deposition current with average bead width and height was 6.84 mm and 1.6 mm respectively. The best deposition current was 160A, with highest area utilization of 81.43% and width uniformity.
Transportation Management in Universitas Indonesia Gandjar Kiswanto; Denni Hanzen; Faradilla Safitri; Farizha Febrianty
Journal of Sustainability Perspectives Vol 1, No 3 (2021)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.989 KB) | DOI: 10.14710/jsp.2021.12567

Abstract

Transportation management is one of the supports for a green and healthy campus. The increasing number of campus population has an impact on the number of vehicles entering the campus environment. So that in order to reduce the number of incoming vehicles, transportation management in the Universitas Indonesia is needed. In addition to regulating the transportation system on campus, transportation management also regulates the prohibition of the UI Civitas Academica from bringing private vehicles into the campus environment. To limit the vehicles that enter the campus environment, UI takes strategic steps such as making policies, building support facilities and planning that have been prepared and will be explained in this paper. to reduce and limit vehicles in the campus environment One of the steps taken by the Universitas Indonesia is to provide Zero Emissions Vehicle (ZEV) transportation such as buses, bicylce, and scooters as a means of transportation that can be used for free by the UI Civitas Academica. To reduce and restrict private vehicles, UI is building a Highway Distribution to facilitate pedestrians, building a BORR (Bikers Outer Ring Road) lane for motorbikes, implementing a gate parking system at every entrance to the UI campus, In addition, UI also enforces various policies such as reducing the parking area, and prohibiting semester 1 and 2 students from bringing private vehicles into the campus environment, this is done by UI to reduce vehicles entering the UI campus
Thermal performance enhancement in electric motor rotors: Evaluating the impact of rotating heat pipes Khairu Rezqi; Nandy Putra; Sholahudin Sholahudin; Gandjar Kiswanto
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/hdn06j82

Abstract

Effective thermal management is essential in high-performance electric motors, where rotor overheating accelerates demagnetization and reduces operational lifespan. This study investigates a horizontally mounted, wick based rotating heat pipe (RHP) as a passive cooling solution for an induction motor rotor. The system was subjected to stepped heat loads 20, 25, 30, and 35 W, also and speeds 0, 250, 500, 750 RPM, with time resolved measurements acquired to evaluate steady state thermal resistance (Rth) and transient response. The results reveal a non monotonic relationship between rotational speed and thermal performance. Contrary to initial assumptions, the RHP achieved its lowest Rth of 0.164 °C/W not at standstill, but at a moderate speed of 250 RPM. This performance peak is attributed to a balanced interplay where gentle centrifugal force enhances capillary-driven liquid distribution, maximizing effective evaporation without inducing flow instability. Compared to the solid rotor baseline, the RHP consistently reduced rotor temperatures by up to 6 °C and lowered thermal resistance by more than 70%. Additionally, the RHP halved the thermal time constant following each power step, indicating superior transient regulation. The identification of an optimal rotational speed window, distinct from any transitional instability zone, offers critical design insight for embedding RHPs in next-generation electric machines where spatial constraints and thermal reliability are paramount.
Tool geometry influence on the tensile load of copper–AA1100 joint using two stage refilled friction stir spot welding (TS-RFSSW) Hikaru Trinita Salsabila; Ario Sunar Baskoro; Shafira Herdiyan Maritza Salsabila; Gandjar Kiswanto; Syarif Junaidi
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/hw8ka649

Abstract

Two stage refilled friction stir spot welding (TS-RFSSW) is a method to eliminate keyholes formed in the friction stir spot welding (FSSW). This study aims to investigate the effect of tool geometry on the tensile shear loads of joints produced by TS-RFSSW. Copper and aluminum AA110 sheets with a thickness of 0.42 mm were joined using the TS-RFSSW process. The tools used in the first stage have taper and triangular pins. In the second stage, pinless tools with 5 mm and 6 mm diameters were used to close the keyhole. Other process parameters used included a dwell time of 4 seconds, a plunge depth of 600 µm, and a tool tilt angle of 0⁰. The TS-RFSSW process successfully produced improved joint surfaces with minimal keyholes, resulting in increased tensile shear loads. The tool with a triangular pin produced joints with higher tensile shear loads due to more intensive material flow. On the other hand, increasing the diameter of the pinless tool for the second stage reduced the tensile shear loads of the joints. The maximum tensile shear load achieved was 292.78 ± 34.72 N using a triangular pin tool for the first stage and a 5 mm pinless tool for the second stage. 
Effect of travel speed ​​and arc length on geometry and heat accumulation in WAAM-GMAW process Agus Sifa; Ario Sunar Baskoro; Afrizal Riyantono; Faza Khoirina; Gandjar Kiswanto; Syarif Junaidi
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/88detg63

Abstract

Wire arc Additive Manufacturing (WAAM) is a technology capable of manufacturing large and complex components using aluminum alloys. This is due to its high deposition rate and efficient material utilization. However, WAAM faces several issues, particularly regarding process stability. In the WAAM process, especially when using Gas Metal Arc Welding (GMAW), stability is largely determined by controllable process parameters such as travel speed and arc length. This study aims to clarify how fusion stability, influenced by travel speed and arc length, affects the resulting deposit geometry and heat accumulation. The experimental method involved conducting a single-layer WAAM process using GMAW, with ER5356 filler (diameter 1 mm) and AA6061 substrate. During the single-layer WAAM GMAW process, the heat temperature and current were measured in real-time on the deposits. The results included minimum and maximum height and width measurements of the deposits produced. It was observed that increasing the travel speed reduced the current, thereby lowering the heat input. Heat accumulation, under fixed parameters of 80 A current, 16 V voltage, and varying travel speeds and arc lengths, fluctuated throughout the process. At an arc length of 6 mm, the single-layer deposit geometry exhibited humping, causing irregular widths and heights. Overall, both travel speed and arc length played significant roles in determining the maximum and minimum heights of the deposits.
Design and analysis of orbital pipe welding prototype for piping system welding applications Agus Widyianto; Ario Sunar Baskoro; Gandjar Kiswanto
Journal of Automotive and Mechanical Applied Technology Vol. 1 No. 2 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v1i1.797

Abstract

Welding the joints of pipes is often required for maintenance and repairs in industrial applications, where pipes are frequently used. A prototype of an orbital pipe welding machine was constructed, and its design, analysis, and construction were carried out. The goal of this endeavor was to improve the quality of the welding process as well as overall productivity. The design study was carried out with the assistance of the SolidWorks program, which allowed for the determination of the stress, strain, displacement, and factor of safety imposed on the gear section throughout the welding and pipe installation process. During pipe installation, the gear section experiences maximum stresses of 3.920e+12 MPa, 5.029e+05 MPa, and 2.239e+06 MPa, respectively. These stresses are a result of the pipe being installed. When the pipe is installed, the highest strain in the gear section is 1.802e+01%, 3.030e-06%, and 8.439e-06%, respectively. This strain happens when the pipe is installed. In addition, the maximum displacement in the gear section is 3.074e+09 mm, 3.215e+04 mm, and 6.312e-03 mm, respectively, when the pipe is mounted and the pipe is installed. With a value of 1.5, the analysis results demonstrated that the maximum stresses, strains, and displacements in the gear section during the welding process are sufficient to fulfill the requirements for the critical safety factor. This demonstrates that the orbital pipe welding equipment may be utilized to generate welds of superior quality while simultaneously enhancing both productivity and efficiency through its utilization.
Co-Authors Afrizal Riyantono Agus Sifa Agus Widyianto Ario Sunar Baskoro Danny Wicaksono Denni Hanzen Faradilla Safitri Farizha Febrianty Faza Khoirina Hikaru Trinita Salsabila Khairu Rezqi Nicholas Ego Guarsa Putra, Nandy Setiadi Djaya Shafira Herdiyan Maritza Salsabila Sholahudin Syarif Junaidi Syarif Junaidi