Worn-Wheel Restoration by Welding and Evaluation of Mechanical Properties

Byeong-Choon, Goo; Hwang, Sung Ho; 최순양,; 이영진,

doi:10.7782/jksr.2018.21.3.241

“…For the new wheel, the maximum wear depth (the current distance minus the initial distance) was 0.12 mm at the end of 12 h. For the repaired wheels, the maximum wear depth was about 0.65 mm. It was found that the wear depth was less than half of the wear depth of the weld-repaired wheel, which were weld-repaired, but had ferritic-pearlitic microstructures [21]. No defects were detected on the surfaces of the wheel and rail discs.…”

Section: Resultsmentioning

confidence: 95%

Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization

Goo

¹

,

Lee²

2020

Sci

4

0

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When a railway vehicle moves on a curved rail, sliding contact occurs between the rail head side and wheel flange, which wears the wheel flange down. The thinned flange needs to be restored above the required minimum thickness for structural safety. In this study, a new process and welding wire for restoring worn-out railway wheels by submerged arc welding was developed. To characterize the properties of the restored wheel, dilatometric analysis of phase transformation, SEM/EDX analyses, hardness measurement, and residual stress measurement using the X-ray diffraction method were performed. Finally, wear tests with full-size wheel/rail specimens were carried out. It was confirmed that the weld metal was composed of bainitic microstructures as intended, and welding defects were not observed. The wear amount of the restored wheel was greater than that of the base material, but it was less than half of the wear depth of the weld-repaired wheel with ferritic–pearlitic microstructures. The developed process seems applicable to industry.

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Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization

Goo¹,

Lee²

2019

Sci

1

0

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When a railway vehicle moves on a curved rail, sliding contact occurs between the rail head side and wheel flange, which wears the wheel flange down. The thinned flange needs to be restored above the required minimum thickness for structural safety. In this study, a new process and welding wire for restoring worn-out railway wheels by submerged arc welding was developed. To characterize the properties of the restored wheel, dilatometric analysis of phase transformation, SEM/EDX analyses, hardness measurement, and residual stress measurement using the X-ray diffraction method were performed. Finally, wear tests with full-size wheel/rail specimens were carried out. It was confirmed that the weld metal was composed of bainitic microstructures as intended, and welding defects were not observed. The wear amount of the restored wheel was greater than that of the base material, but it was less than half of the wear depth of the weld-repaired wheel with ferritic–pearlitic microstructures. The developed process seems applicable to industry.

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Applicability Verification of Restoration by Welding to Extend the Lifetime of Railway Wheel

Kim,

Moon,

Cho

et al. 2023

J Appropr Technol

0

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Railway wheels, when subjected to wear beyond their designated usage standards due to the operation of railway vehicles, are traditionally managed through a turing maintenance method. This process involves turing the entire worn portion to secure the requisite cross-sectional shape. This approach often leads to disposal after just 2 to 3 turing maintenance cycles. Excessive turing, extending beyond the worn parts, can cause the wheels to fail to meet railway operating specifications. Discarded railway wheels, which contain a high carbon content essential for driving performance, are not repurposed but are instead entirely stockpiled. This research introduces a novel welding restoration technology for railway wheels, targeting the flange portion, a principal area of wear. Utilizing submerged arc welding techniques, this method enables the localized repair of worn parts, minimizing the turing thickness and thus extending the useful life fo railway wheel. To evaluate the on-site applicability and dependability of this welding restoration method, real rail vehicle driving tests were conducted using both conventionally turned and welding-restored railway wheels. Analysis of the wheel profiles substantiated that the welding restoration method delivers mechanical performance comparable to that achieved by traditional turning maintenance.

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Worn-Wheel Restoration by Welding and Evaluation of Mechanical Properties

Cited by 3 publications

References 0 publications

Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization

Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization

Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization

Applicability Verification of Restoration by Welding to Extend the Lifetime of Railway Wheel

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