Study into the process of defective railtrack arc-hardfacing

Yordan Stefanov Denev; Aylin Rafetova; Plamen Dichev

doi:10.29114/ajtuv.vol7.iss1.281

Yordan Stefanov Denev Department of Naval Architecture and Marine Engineering, Technical University of Varna http://orcid.org/0000-0001-7124-1600
Aylin Rafetova Department of Naval Architecture and Marine Engineering, Technical University of Varna
Plamen Dichev Department of Naval Architecture and Marine Engineering, Technical University of Varna

DOI: https://doi.org/10.29114/ajtuv.vol7.iss1.281

Keywords: railway, deep water, towing tank, carriadge, arc deposition, microstructure

Abstract

The paper focuses exclusively on the manual arc hardfaced layers of railtrack repairing. The study is conducted in two stages- structural analysis of layers and mechanical characteristic(hardness) study. Two types of technologies for defective areas rebuilding are developed. The first one is hardfacing without a buffer layer, and the second one is with a buffer layer. The process is carried out using electrodes particularly appropriate for this purpose, namely OK 83.28 and OK 67.45, and is designed to achieve the original hardness of the railtrack. All in all, the desired hardness value and magnitude can be achieved by hardfacing the defective areas without a buffer layer, and with the use of OK 63.28 electrodes.

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