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Originally Posted by Wikipedia
In mechanical engineering, a fillet (pronounced “fill-it”) is a concave easing of an interior corner of a part used to reduce stress concentration. A chamfer is the opposite of a fillet, being a convex easing of an exterior corner.
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Example of non-filleted and filleted poles
It is common to find a fillet where two parts are welded together
http://en.wikipedia.org/wiki/Fillet_%28mechanics%29