weld·er /ˈwɛldɚ/
  焊工,焊機
  Weld·er n. One who welds, or unites pieces of iron, etc., by welding.
  Weld·er, n.
  1. One who welds, or wields.  [Obs.]
  2. A manager; an actual occupant.  [Ireland. Obs.] “The welder . . . who . . . lives miserably.”
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  welder
       n : joins pieces of metal by welding them together