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Abstract: Runner’s temperature field and stress field during the
period of welding are simulated on the basis of attaining simplified
model of Francis turbine runner, realizing the thermal source loading of
multi-pass welding and solving the problem of conduction between
independent entities. Thermal cycle curves of different striking places,
evolvement process of longitudinal stress and residual stress field
after welding are obtained. The simulation result shows that maximal
welding stress appears along the adjacent area between blades and bands
or blades and crown. The result can explain why fatigued crack on the
turbine runner’s blade appears and extends.
Key words: Runner Blade Temperature field Stress field
CLC No: TG156
Received 20030926,
received in revised form 20040315
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