Fabriaction of fan with blades made from Corten A, 6mm thick vanes, 1600mm dia, welded to mild steel hub 30mm thick with 400mm bore.
Using Corten to not have to paint and would also not want to stress relieve either.
Completed an ANSYS study showing at over speed welds are below fatique limits...
Problem:
Alternator Rotor winding failure (Turn to turn.) only on 400volt machines in parallel with grid. Not on high voltage machines on same installation. (Rotor construction identical.)
Site conditions:
Very weak grid, with lots of loss of mains.
Lots of power factor correction...
