SHIELDING GASES DESIGNATION
CLASSIFICATION SYSTEM FOR SINGLE GAS
                     SG – B
(1.) Shielding gas designator            (2.) Base gas designator
CLASSIFICATION SYSTEM FOR MIXTURE OF GASES
                      SG – BX – %
(1.) Shielding gas designator             (2.) Base gas designator            (3.) Component
CLASSIFICATION SYSTEM FOR SINGLE GAS
Carbon dioxide (Co2)    :       SG – C
Argon     :                SG – A
CLASSIFICATION SYSTEM FOR MIXTURE OF GASES
Argon – Co2 Â Mixture[75+25]Â Â Â :Â SG-AC-25