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Virtual Optimization of Regulating and Controlling on Welding Residual Stress of Francis Turbine Runner

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Abstract:

In order to solve the problem of crack appeared in Francis turbine runner, the welding residual stress of Francis turbine runner is regulated and controlled by means of numerical simulation from the view of subsection welding, local heating and local peening. The results show that the length of welding section of blade outlet and the welding direction in the subsection welding process influence the residual stress of the turbine blade. For the local heating technology, the decreasing effect on residual stress increases with the increase of heating time, heating temperature and heating area. The welding residual stress of dangerous region decreases and then increases with the increase of heating distance. Moreover, the peening effect is very clear when the temperature of material in the peening region reaches its own plastic temperature.

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Periodical:

Materials Science Forum (Volumes 704-705)

Pages:

762-769

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.704-705.762

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Online since:

December 2011

Authors:

Shu De Ji, Xue Song Liu, Jian Guo Yang, Zhen Lei Liu

Keywords:

Blade, Local Heating, Subsection Welding, Welding Residual Stress (WRS)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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