Rotary piercing is a hot working metalworking process for forming thick-walled seamless tubing. There are two types: the Mannesmann process and Stiefel process.
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Famous quotes containing the word piercing:
“Old, aching God, grey with endless care,
calmly piercing evil’s new disguises,
glad of good surprises, wiser than despair
Hail and Hosanna, old, aching God!”
—Brian Wren (b. 1936)