英文關鍵字
welding
machine
tool
equipment
electrodes
manual
arc
plasma
electroslag
spot
symbol
nonconsumable
submerged
hyperbaric
butt
transformer
inverter
semiautomatic
device
aluminum
copper
apparatus
industrial
instrument
mask
repair
steel
stroke
technology
welder
worker
work
icon
motion
graphic
animation
pictogram
hd
animated
item
sign
set
pack
color