welder

noun6

1. •
   One who welds, that is, unites pieces of steel, aluminum, or other metals by welding.
2. •
   A machine that welds.
3. •
   A machine that a human operator uses for welding.
4. •
   A robotic machine that welds automatically.
5. •
   One who welds, that is, wields.
6. •
   A manager; an actual occupant; a land-tenant holding under the farmer or middleman.