arc

boiler

certification

clothes

color

defense

exam

examining

factory

fire

flames

framework

helmet

hire

horizontal

industrial

industry

inside

inspection

male

man

manufacture

manufacturing

mask

men

metal

metallic

occupation

one

person

photograph

position

process

protection

protective

qualification

safety

security

shield

site

skill

steel

technician

testing

tool

vertical

wear

welder

welding

work

working

workshop