15
Quaternary (4) Shielding Gas Mixtures
Argon-Helium - Co2-
O2 Commonly
known as a ”quad mix”, this combination is most popular for high deposition
GMAW using the high
density metal transfer type arc characteristic. This mixture will give good mechanical
properties and operability
throughout a wide range of deposition rates. Its major application is welding
low alloy high tensile base
materials but has been used on mild steel for high productivity welding. Weld
economics are an important
consideration in using this gas for mild steel welding, in that other less expensive
mixtures are available
for high deposition welding. Regardless
of the type of welding that need to be done, there is a shielding gas that will
best suit the requirements.
Tables 4-1 and 4-2 summarize
which shielding gas is best suited for welding a variety of
materials using both the short arc
and spray arc process.
