I can see two uses for the copper; to help level out defects, and to add extra weight to a clubhead if you need it. The iron factory sometimes does this when refinishing, but I don't think the original manufacturers do it. At least the irons I've got don't show evidence of copper on the areas of original finish I've filed away.
I'm a newbee at this too, and am planning on stripping off the old chrome with anodyse/chrome stripper, (these are carbon steel irons), filing-polishing etc.., blasting the face area, copychroming them, buffing that if it looks like it'd help, then maybe blasting the face again with fine beads if it does'nt look flat enough. If anyone has a better idea I'd like to hear it.
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