Repair of Light Rail Track Through Restoration of the Worn Part of the Railhead Using Submerged Arc Welding Process

Document Type

Article

Publication Date

4-14-2020

Publication Title

International Journal of Advanced Manufactoring Technology

Volume

107

First page number:

3315

Last page number:

3332

Abstract

A surface worn C-Mn rail is repaired by retrieving the lost part of the railhead using a commercial rutile flux-cored wire submerged arc welding (SAW) method. Optical microscopy (OM), scanning electron microscopy (SEM), electron-dispersive X-ray spectroscopy (EDS), and Rockwell B hardness test are employed to investigate the properties of the repaired rail specimen. After the first set of analysis, the as-repaired rail is heated up to 1100 °C and water-quenched to room temperature to increase hardness. Each specimen is analytically partitioned into three zones including weld zone (WZ), heat-affected zone (HAZ), and the unaffected rail substrate. The as-repaired rail WZ is primarily composed of pearlite, ferrite, and austenite with a low hardness of 80 HRB, whereas the austenite phase is gone in the as-quenched rail and a massive extent of carbides are precipitated which increased hardness to 95 HRB. The microstructure of the HAZ in the as-repaired sample is a uniform distribution of fine-grained ferrite, pearlite, and carbide with the hardness of 92 HRB, while the microstructure of the identical zone in the as-quenched specimen is mainly martensitic-pearlitic with the highest average hardness among all zones, 110 HRB. The results presented an immense potential for SAW in rail repair.

Keywords

Submerged arc welding; Steel; Hardness; Rail-wheel tribology; Optical microscopy; Electron microscopy

Disciplines

Transportation Engineering

Language

English

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