After the tube has been bent, the sand is shaken out. Tubes also can be plugged with various…

After the
tube has been bent, the sand is shaken out. Tubes also can be plugged with
various flexible internal mandrels for the same purpose as the sand. Note that
(because of its lower tendency for buckling) a relatively thick tube to be
formed to a large bend radius can be bent safely without the use of fillers or
plugs.

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