Gas composition and GMAW
Gas composition and GMAW
(OP)
How does extra CO2 affect the GMAW process?
Specifically switching to 75%-25% Ar & CO2 from 92%-8% Ar & CO2.
Specifically switching to 75%-25% Ar & CO2 from 92%-8% Ar & CO2.
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RE: Gas composition and GMAW
RE: Gas composition and GMAW
Generally, the minimum percentage of Ar to ensure a stay spray transfer is 80%. Reducing the Ar content can result in inconsistent transfer mode, i.e., the process alternates between short circuiting and spray transfer. The encourage spray transfer with the low Ar content, the arc voltage has to be increased.
you can spray with 75% Ar, but it tends to be somewhat unstable. I usually limit the CO2 to 12% or less when spray transfer is required. The 92% Ar *5 CO2 gets my vote every time.
Best regards - Al