The slag protects the weld from the outside atmosphere, cleaning purposes, and on some rods part of the slag goes into the weld. By the time that you are done welding a part, the underlying weld metal will be totally solidified and chipping away the slag will not cause any problems. I would let it cool just so the slag comes off easier and it won't hurt as bad when it hits your eye.
Now if you quench your weld, THAT is a completely different story......
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The mind is nothing without the body and the body is nothing without the mind. You need them both to make the rational decisions we so make every day. Some we don't put as much thought into them as we should, and others we take a little too seriously. So slow down, take a breather, and think.
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