ISO 14175 - Classification and shielding gas designation

(SFI/IWE 1.06 - Table 3: Classification of process gases for welding joints and related processes)
 

ISO 14175 - I1 : 100% Argon

ISO 14175 - I3 : 30% He and rest Argon

ISO 14175 - C1 : 100% CO2