機器
arc
assembly
bright
construction
construction site
construction worker
craftsman
danger
engineering
equipment
fabricate
factory
fire
flame
flash
gas
hot
industrial
industry
job
labor
laborer
light
man
manufacture
manufacturing
mask
metal
metalwork
operator
power
protection
repair
safety
skill
skilled
smoke
spark
steel
structure
tool
welder
welding
welding sparks
welding torch
work
worker
workman
workplace