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Jurnal Teknologi dan Riset Terapan (JATRA)
Published by Politeknik Negeri Batam
ISSN : 26854910     EISSN : 26854910     DOI : -
Core Subject : Science, Engineering,
Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering
Jurnal Teknologi dan Riset Terapan (JATRA) is scientific, peer-reviewed and open access journal managed and published by Research and Community Services, Politeknik Negeri Batam. The journal is published two times a year on June and December. Jurnal Teknologi dan Riset Terapan (JATRA) provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 96 Documents
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Studi Kasus Kualitas Pengelasan Pada Material A694 F65 Overlay Inconel 625 Claded Menggunakan Metode Kombinasi Gtaw & Smaw Sugondo, Ebeng; Purba, Adi Syahputra; Kms M Avrieldi; Ismiyatun Nurjannah
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10531

Abstract

Welding is a method of connecting metal that involves melting a portion of the parent and filler metals until they are liquid enough to fuse. Nowadays, welding is becoming more and more common, particularly in the oil and gas sector. Combining GTAW with SMAW techniques is one of them. Because it can create robust and corrosion-resistant joints, the oil and gas industry frequently uses the combination of GTAW and SMAW welding techniques. The welding procedure on ASTM A694/F65 material covered with Inconel 625 will be covered in this study. While Inconel 625 is resistant to corrosion and stress cracking, A694/F65 steel will offer toughness for applications with low temperature field circumstances. The benefits of the various welding techniques are strategically integrated by this combination of welding procedures. While SMAW delivers great mechanical strength and filling efficiency for the fill to cap weld portions, GTAW will offer superior penetration and surface cleanliness on the root weld. The results of the tests, which included visual inspection, Magnetic Particle Inspection (MPI), and Ultrasonic Testing (UT), demonstrated that no evidence of serious flaws exceeding the acceptance criteria of the cited standards AWS D1.1:2025 for MPI and ASME Section VIII Div. 1 Appendix 12 for UT was discovered. It is anticipated that the study will serve as a guide for the welding procedure on gas and oil pipes.
ANALISIS PROSES PENGELASAN REPLATING LAMBUNG KAPAL PADA KONDISI FLOATING TERHADAP NILAI KEKERASANNYA: PENGELASAN LAMBUNG KAPAL Djumiati, Andri; Mochammad Karim Al Amin; Egi Yuliora; Nurul Atik Hamida; Puspita Khumairoh; Deby Ardianti; Sabila Fitri Afsari
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10850

Abstract

Replating the ship’s hull is an essential repair process to ensure that a vessel remains operationally seaworthy. Replating welding can be performed under both docking and floating conditions. These differing conditions influence the cooling rate, which in turn can result in variations in hardness (HV). This study examines the effect of varying the distance from the waterline (30, 60, 100, and 130 mm) and water temperature (25°C, 28°C, 30°C, and 32°C) on the hardness values produced during welding under floating conditions.Each variation combination was tested using the Vickers method with three repetitions, and the reported HV values represent the average of those measurements. The results show that the highest hardness value under floating conditions reached 218.5 HV (30 mm, 25°C), while the lowest was 195.7 HV (130 mm, 32°C). All measured hardness values remained within the acceptable limits specified by BKI for low-carbon steel.This study demonstrates that the closer the weld groove is to the water surface and the lower the water temperature, the higher the resulting hardness due to increased cooling rates. The limitations of this study include the absence of microstructural data and the unavailability of individual measurement data for further statistical analysis.
ANALISIS PERFORMA COOLING TOWER JENIS INDUCED DRAFT COUNTER FLOW DI POWER PLANT PT. X Purba, Jhon Hericson; Syaputri, Alfina
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10911

Abstract

The cooling tower is a crucial component in the water cooling system of a power plant. During its operation, the cooling process occurs when the water entering the cooling tower undergoes heat transfer through direct contact with cool air, resulting in evaporation. This process leads to water losses in the form of evaporation loss and blowdown, which affect the cooling capacity of production equipment. This study aims to analyze the performance of an induced draft counter-flow cooling tower at PT. X by examining parameters such as range, approach, cooling effectiveness, evaporation loss, and cooling capacity. The results indicate that the cooling tower operates with a range of 6.03°C, an approach of 4.4°C, a cooling effectiveness of 58.75%, a make-up water rate of 43.07 m³/h, and a cooling capacity of 29,419.58 kW. A strong correlation (0.958) between inlet and outlet water temperatures demonstrates consistent heat transfer performance. The system shows improved performance, with ΔT increasing from 2.78°C in 2015 to 6.44°C in 2024. Based on the analysis, it can be concluded that the cooling tower remains feasible for operation but requires regular maintenance to optimize performance.
Pengaruh Jenis Elektroda RD dan LB E6010 Terhadap Laju Korosi Sambungan Las SMAW Pada Baja Ringan Dalam Media Air Laut Syam, Muh Yusril; Ainun Chandra Puspa Nigrum
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10981

Abstract

Mild steel is widely used in construction because it is lightweight and economical, but it is susceptible to corrosion, especially in marine environments with high chloride ion content. Shielded Metal Arc Welding (SMAW) welded joints are vulnerable due to microstructural changes and weld defects that accelerate damage. This study aims to analyse the effect of RD and LB E6010 electrodes on the corrosion rate of mild steel welded joints in seawater. The research method involved welding 1.5 mm galvanised steel using 70–90 amps of current with the stringer bead technique. The samples were then immersed for 21 days in seawater from Pagatan Beach, South Kalimantan, and tested using the weight loss method. The test results showed that the RD electrode had a corrosion rate of 0.83 mm/year, which was lower than that of the LB electrode at 1.11 mm/year. This difference was influenced by weld defects, where the LB electrode produced more porosity, slag inclusion, and pitting corrosion. Based on the ASTM G46 classification, both values fall into the moderate category. It can be concluded that the use of RD electrodes is highly recommended for light steel joining applications in marine environments, given their superior corrosion resistance.
IDENTIFIKASI WASTE DEFECT DENGAN VALSAT DAN PEMBUATAN JADWAL MAINTENANCE UNTUK MENINGKATKAN AVAILABILITY DAN MENGURANGI DEFECT. Irma Agustiningsih Imdam; Muhammad Aqsho; Juliansyah Aristama; Nico Sachzehan
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10985

Abstract

This research aims to identify and minimize waste in the join maple production process at PT MNO, an IKM (small and medium industry) company operating in the automotive component sector. A lean manufacturing approach was applied using Value Stream Mapping (VSM) to analyze the overall production flow. Furthermore, a Waste Assessment Questionnaire (WAQ) followed by a Waste Relationship Matrix (WRM) was used to determine the most dominant type of waste. The results indicate that defect waste is the main problem, leading to increased production time due to additional rework activities. Three types of defects were identified in join maple products, namely burnt defects, small head dimensions, and burr defects. The VALSAT approach using Quality Filter Mapping (QFM) revealed that burr defects were the most dominant, occurring in the cutting process at a rate of 1.26%, exceeding the company standard of 1%. Based on fishbone diagram analysis, the main causes of burr defects include corrective maintenance practices, the absence of a periodic tool replacement schedule, and weak implementation of the 5S/5R culture. The proposed improvements include daily tool inspections as preventive maintenance, the use of inspection check sheets, scheduled tool replacement, and the application of jidoka. The results show that the defect rate decreased from 1.26% to 0.88%, availability increased from 88% to 94%, performance efficiency rose from 63.76% to 80%, and quality improved from 98.73% to 99.34%, resulting in a 19.55% increase in Overall Equipment Effectiveness (OEE).
DESIGN AND PROTOTYPE DEVELOPMENT OF AN IOT-BASED TEMPERATURE AND HUMIDITY MONITORING SYSTEM WITH REAL-TIME DATA AND AUTOMATED ALERTS Wivanius, Nadhrah; Isranda Sihombing, Willy; Kamsyah, Domi
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.11679

Abstract

This study presents the design and implementation of an Internet of Things (IoT)-based system for real-time monitoring of room temperature and humidity. The system integrates a DHT11 sensor with an ESP32-C3-WROOM-2 microcontroller to measure environmental parameters within ranges of 0–50 °C and 20–90% relative humidity, achieving accuracies of ±2°C and ±5% RH, respectively. Measurement data are displayed on a 20×4 I2C LCD and transmitted wirelessly via Wi-Fi to Google Sheets for cloud-based storage and analysis. The system features an automatic notification mechanism that sends alerts through WhatsApp when environmental conditions exceed predefined thresholds. Calibration testing against the HTC-2 reference standard device demonstrated a total average measurement error of 1.594%, confirming compliance with the DHT11 sensors specified tolerance limits. Consistency tests conducted in both air-conditioned and non-air-conditioned environments revealed that the system effectively captures genuine environmental variations, with higher variability observed in mechanically controlled spaces due to HVAC operational cycles. The developed prototype successfully addresses limitations of conventional monitoring methods by eliminating manual intervention requirements, enabling continuous real-time surveillance, and facilitating rapid preventive actions. Results indicate that the system provides sufficient measurement accuracy and stability for practical applications in residential, commercial, and industrial environmental monitoring, while offering a cost-effective and accessible solution for IoT-based climate control systems.

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