Originally Posted by
aggiegrads
Ah, I understand your question now. No - all pedals are removable. I am certain that no pedal was ever permanently fixed on the crank arm by design. Especially one with wrench flats.
I wouldn't put it beyond someone welding a pedal spindle into a steel crank arm. But, that is less likely with a steel spindle and aluminum crank arm.
If the pedal is broken and non-repairable, I'd go by the theory of nothing you can do can make it worse.
Perhaps put the crank arm in a vise and use a cheater, or even a really large pipe wrench.