The striking face of a hammer is harder than the body. Similar to how they harden the edges of knives while keeping the spine softer. Smack two hard pieces of metal together and they crack and fire chips at you. Also they bounce. I was working on a piece of wear plate that had hard surfacing on it, really hard alloy welded to regular carbon steel plate. There was a small pointy bit after cutting, figured I’d just give er a whack with the hammer and next thing I know I’m picking a chunk out of my cheek just below my safety glasses. Rookie move totally, same thing though.
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