機器
acetylene
attachment
build
burning
close up
concept
construction
cutting
danger
equipment
factory
flame
flash
gas
gauging
glove
h beam
hand
handkerchief
heating
helmet
industrial
industry
iron
job
maintenance
man
manual
metal
occupation
oxygen
people
pipe
plate
process
protection
purple
rust
safety
stainless
steel
structure
tool
torch
uniform
weld
welding
work
worker