Ammonia , Argon, Arsine , Boron Trichloride , Boron Trifluoride, Carbon Dioxide , 80% Ar 20% CO2 mixture gas 80% Argon +20% carbon doxide Mainly used in satinless steel welding Mixture gas argon gas 80% & CO2 20%. 80% Argon +20% carbon doxide Mainly used in satinless steel welding 80% Ar 20% CO2 mixture gas