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For fin repairs if the part that is missing is big welding the broken part or a piece of appropriate sheet back is a good option, it saves on time and heat input to the part.
If the damage is small or access to weld a piece in is not possible (between other fins) then the fin can be built up by building up bead on bead.
Essentially it is just a big edge weld and repeat, manual 3d metal printing if you like, followed by filing and sanding back to shape.
I've built back snapped raised lugs and pieces of engine covers and cases that had parts broken out using that technique.
If the buildup is big there is the possibility of pulling the part out of shape especially if the part has thin walls and is aluminum because it has high solidification shrinkage.
Color matching the weld to cast is problematic if the part is not to be painted and matching surface finish with the cast is something I'm yet to look into though I've always thought some form of blasting might do it.
Andy
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