英文關鍵字
arc
building
construction
craftsman
electrode
equipment
factory
fire
gas
greenhouse
heat
heavy
industrial
industry
iron
light
maintenance
manufacture
manufacturing
mask
metal
metalwork
mig
model
pipe
pipeline
production
protection
protective
repair
safety
skill
smoke
spark
stainless
steel
structure
technical
technology
texture
tig
tool
tube
weld
welded
welder
welding
work
worker
working