機器
arc
assembly
cheerful
construction
craftsman
electrode
engineering
equipment
factory
flash
gas
happy
hard
hardhat
hat
helmet
hot
industrial
industry
iron
job
labor
man
manufacture
manufacturing
mask
metal
protection
repair
safety
skill
skilled
smiling
smoke
spark
steel
technical
technology
tool
torch
uniform
weld
welder
welding
work
worker
working
workplace
workshop