arc
assembly
build
construction
craftsman
dark
engineering
equipment
fabrication
factory
fire
flame
flash
gas
helmet
hot
industrial
industry
iron
job
labor
laborer
light
man
manufacture
manufacturing
mask
metal
metalwork
occupation
production
protection
repair
safety
skill
skilled
smoke
spark
steel
structure
technical
technology
tool
trained
weld
welder
welding
work
worker
workplace