A Heat Transfer Modeling Study of Rail Thermite Welding
Chen, Yiren
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https://hdl.handle.net/2142/83248
Description
Title
A Heat Transfer Modeling Study of Rail Thermite Welding
Author(s)
Chen, Yiren
Issue Date
2004
Doctoral Committee Chair(s)
Lawrence, Frederick V., Jr
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Metallurgy
Language
eng
Abstract
This investigation is concerned with the effect of welding conditions on the development of fatigue-critical weld defects in rail thermite welds. Finite Element Modeling (FEM) was used to analyze the heat transfer behavior during the thermite welding process. The results of the thermal analyses were correlated to the development of various weld defects and compared with measurements performed on laboratory thermite welds. The effects of welding parameters on weld defect development were explored through a series of thermal simulations. It was found that a wider weld gap, a longer preheating time, and a higher liquid temperature help to reduce the occurrence of the most severe weld defects in thermite welds. The influence of welding conditions were summarized in defect formation maps which can be used to guide the selection of welding parameters for improving the quality and reliability of thermite welds.
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