機器
arc
arm
background
blue
bright
closeup
construction
dark
electrode
engineering
equipment
fabrication
factory
fire
flash
heat
heavy
hot
indoors
industrial
industry
iron
laborer
light
making
man
manufacture
manufacturing
mask
material
men
metal
metalwork
plant
power
production
protection
safety
skill
smoke
spark
steel
technician
technology
weld
welder
welding
worker
working