Like this one?




Not my pic, saved from the internet and I forget where, but the person who posted it said the blobs are definitely brass. WTF? Brazing by dipping in a big cauldron of molten brass, then forgetting to drain out the excess?
Not much of a cost-cutting method if you put $50 worth of brass in each frame. There must be some other explanation. Stiffening, for a sprinter? The mind boggles.