Carbon dioxide decomposes at arc temperature into carbon monoxide and
It is thus not truly inert. When a deoxidizing electrode is used,
welds are produced with no harmful gas porosity. It is a fact that
good penetration and welding speed can be achieved, mostly with
globular transfer mode. Welding with carbon dioxide is less expensive
than with argon.
It is questionable if there are any advantages in the use of three gas