Deburring is a finishing process used for metal parts that have been machined, fabricated, welded or cast. These processes leave residue (or scale) and imperfections (or burrs) on the metal surface that must be removed in order for the part to be used. Imperfections and raised edges can prevent parts from fitting properly or can cause machinery to break down. Residue can prevent proper seals between parts.
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in section "Metal-working machines"