welder A tool for melting two overlapping objects enough for the two liquids to mingle before setting solid again
welding fume extractor An extractor system (drawing air from the work environment by fans or other means) expressly for removing welding fumes from the work place
welding helmet A helmet, usually with a UV filter in its visor, to protect the wearer from stray (hot) objects and radiation while welding (particularly arc welding)
welding robot An automatic system (a robot) for performing repetitive welding operations, specifically on the production line
welding torch A tool, consisting of a hot jet of burning gas, for melting two overlapping objects enough for the two liquids to mingle before setting solid again
wind turbine A motor that produces rotational power to a central drive shaft, obtaining that power from from the impact of the wind on to the angled blades radiating from that shaft
wiring duct A large hollow pipe or boxing for containing electric cables