Improving the technology of thermite rail welding
https://doi.org/10.52170/1815-9265_2022_60_76
Abstract
Thermite welding used for connection rails, railroad switch elements and railroad repairs. The widespread use of this welding method is associated with the relatively low cost of receiving rail joints. The disadvantage of thermite welding of railways is the duration of the technological process for obtaining railway connections that is about 159...189 minutes.
This article proposes a technology for grinding thermite welds in a hot state, which makes it possible to reduce the duration of the process of obtaining welded rail joints to 74...76 minutes. It is recommended instead of two grinding operations, preliminary and final, to perform one grinding operation of thermite welds in the temperature range 600…560 °C. The temperature range 600…560 °C is based on the results of the experimental studies described in article. Grinding of welded joints was carried out at different temperatures in the range 850…560 °C. According to the results obtained, grinding in the range of 600...560 °C leads to an increase in the hardness of the tread surface in the weld zone by 2...4 HRC. Measurements of microhardness in the cross section showed that the thickness of the layer with increased hardness reaches 1…1,5 mm. The wear resistance of samples ground in the temperature range of 600…560 °C was higher than that of other samples.
Approbation of the proposed technology confirmed that thermite welds, which were ground in a temperature range of 600...560 °C, meet the requirements of technical specifications for thermite welding of rails.
About the Author
E. S. Sidorov.
Siberian Transport University
Russian Federation
Russian Federation
Eduard S. Sidorov – Lecturer of the Department Technology of transport engineering and machine operation
Novosibirsk
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Review
For citations:
Sidorov. E.S. Improving the technology of thermite rail welding. Bulletin of Siberian State University of Transport. 2022;(1):76-85. (In Russ.) https://doi.org/10.52170/1815-9265_2022_60_76
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