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Characterization of Surface Defects Associated with Flash Butt-Welded Pearlitic Rails and their Contribution to Overload and Fatigue Failures

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Abstract:

Generally about 80 percent of railway tracks are welded by flash-butt welding that consists of electrical heating and hydraulic forging. Fracture of rails specially weld zone fractures are of main concern because of potential risk of a catastrophic derailment. In this paper, surface defects associated with flash butt welding process are examined. Metallographic and fractographic studies show various defects can be formed at the surface of weld zone. Formation mechanism of these defects and their contribution to the observed fatigue and overload weld failures are discussed. Fracture mechanics is also utilized to clarify the role of these defects in fatigue and overload failures.

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Info:

Periodical:

Advanced Materials Research (Volumes 83-86)

Pages:

1262-1269

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.83-86.1262

Citation:

Cite this paper

Online since:

December 2009

Authors:

Mostafa Mousavizade, Hassan Farhangi

Keywords:

Flash Welding Process, Fracture, Rail, Surface Defect

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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