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Journal of Metals, Materials and Minerals

Publication Date

2025

Abstract

The rail transport system is essential for moving passengers and heavy goods over long distances, with steel 900A being a common material used for rail tracks in Thailand. Prolonged exposure to heavy loads and variable environmental conditions can lead to rail track damage known as "engine burn”, which results from friction between the train’s wheels and the rail. The flux-cored arc welding (FCAW) process is employed to repair these burns due to its use of readily available electrode wires and the efficiency of the repair. However, welding high-carbon steel like rail steel 900A poses challenges, such as a tendency to form martensite in the heat-affected zone and susceptibility to hydrogen cracking. The Fe-NiMnMo electrode has been identified as effective for hard-facing and repairing damaged rail surfaces. This study investigates the efficacy of the FCAW process using Fe-NiMnMo electrodes for repairing engine burns on rail steel 900A. Results demonstrate that the Fe-NiMnMo electrode strongly bonds with rail steel 900A. Multi-pass welding offers superior mechanical properties compared to single-pass welding, showing lower friction coefficients and wear rates. Detailed analysis using X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), Vickers hardness testing, and high-temperature tribometry was studied to assess the mechanical properties and performance of the repaired rails.

DOI

10.55713/jmmm.v35i1.2292

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