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Abstract: Francis turbine runner’s welding temperature field and
stress field are simulated on basis of realizing the welding thermal
source’s movement along any complicated spatial route and solving the
problem of heat conduction between blade and crown or band. The
simulation result shows that welding residual tensile stress appears on
the weld and nearby while the peak value of residual tensile stress
appears on the blade’s outlet edge of weld area. Moreover, the contrast
of residual tensile stress between different welding sequences shows
that the evener the filler metal of weld during the welding process is
filled, the less the peak value of residual tensile stress is.
Key
words: Runner
Blade Welding sequence Residual stress
CLC No: TG44
Received
20041214, received in revised form 20050406
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