機器
arc
assembly
background
construction
defense
engineering
equipment
fabrication
face
factory
fire
flame
framework
gas
helmet
industrial
industry
iron
job
joint
labor
light
male
man
manual
manufacturing
mask
metal
metallic
natural
protection
protective
rolled
safety
seam
security
shield
skilled
spark
steel
structure
tool
weld
welder
welding
work
worker