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All Journal Jurnal Teknologi dan Riset Terapan (JATRA) Journal of Marine-Earth Science and Technology
Ainun Chandra Puspa Nigrum
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Aerospace Engineering Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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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.
EVALUATION OF THE VIABILITY OF TARIFFS BASED ON TRANSPORTATION EXPENSES FOR CATAMARAN RIVER SERVICES ON THE PARANGLOE - LAKKANG ROUTE Muh Yusril Syam; Ainun Chandra Puspa Nigrum
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v6i1.8782

Abstract

Establishing ship fares necessitates a thorough examination because it encompasses multiple cost factors, with fuel being the primary expense. For operators, it is crucial to determine fares that not only account for operational expenses but are also competitive and accessible for users of the service. This research investigates the viability of river transport fares using catamaran vessels on the Parangloe–Lakkang route, which can accommodate 12 passengers and 10 motorcycles, with a maximum of 8 vessels in operation. The aim of this research is to assess the minimum fare needed for the vessels to function sustainably by employing the Required Freight Rate (RFR) method, alongside evaluating passengers' ability and willingness to pay through the Ability to Pay (ATP) and Willingness to Pay (WTP) methodologies. The analysis reveals that the lowest minimum fare for passengers is Rp1.910/trip for vessel 3, while vessel 8 has the highest minimum fare at Rp2.442/trip. The ATP for passengers has been noted at Rp2.893/trip, whereas the WTP is recorded at Rp2.000/trip. These findings imply that the RFR fare falls between the WTP and ATP figures, indicating it is within a suitable range for fare policy. This result is significant as it provides a foundation for establishing sustainable fares and promotes enhancements in the quality of river transport services to ensure they are safer and more enjoyable for passengers.
Co-Authors Muh Yusril Syam Syam, Muh Yusril