arc

blue

bright

burning

close

construction

cut

energy

engineering

equipment

fabrication

fire

flame

flare

flash

for

frame

fumes

gas

heat

hot

industrial

industry

iron

labor

light

line

man

manhole

manual

manufacturing

mask

material

metal

occupation

orange

production

protection

skill

spark

sparks

steel

street

structure

technology

tool

weld

welder

welding

work

worker