Heat Transfer Modelling in Wide Gap Rail Thermite Welding

Journal of Advanced Materials and Processing

مقاله 5، دوره 1، شماره 2، تیر 2013، صفحه 29-38   

نوع مقاله: Research Paper

نویسندگان

A Mohassela¹؛ A. H Kokabi¹؛ P Davamia¹؛ E Ranjbarnodeh^{* 2}؛ M Movahedia¹

¹Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran

²Young Researchers Club, Department of Engineering, Islamic Azad University, East Tehran Branch Tehran, Iran

چکیده

In the current study, a thermal model was used to investigate the effects of welding parameters on the distribution of temperature in wide gap aluminothermic rail welds. To solve the governing thermal equation, SUTCAST, a finite difference program (FDM) was employed while different aspects such as phase change and convective heat transfer in weld pool were taken into account in the numerical solution. To validate the predictions, the modeling results were compared with the experiments and despite some utilized simplifications, a reasonable agreement was found between numerical and experimental results. The effects of welding variables such as preheating; initial liquid temperature and weld gap on temperature distribution were studied. The results of the modeling showed that the magnitude of weld gap had the greatest influence on thermal behavior of the joint and the highest weld gap results in most stable results.

کلیدواژه‌ها

heat transfer؛ Aluminothermic rail welds؛ FDM؛ Preheating temperature؛ Initial liquid temperature؛ Weld gap