Welding shielding gases

Welding shielding gases specified in AWS A5.32 or ASME Part C SFA 5.32 2019 Edition.

Identification

  • A — Argon
  • C — Carbon Dioxide
  • He — Helium
  • H — Hydrogen
  • N — Nitrogen
  • O — Oxygen

AWS Classification in Table 1

Gas Classification Min. Purity %
Argon SG-A 99.997
CO2 SG-C 99.8
Helium SG-He 99.995
Hydrogen SG-H 99.995
Nitrogen SG-N 99.9
Oxygen SG-O 99.5

AWS Classification in Table 4 - Typical Gas Mixtures

Gas Classification Mixtures %
Argon + CO2 SG-AC-25 75/25
Argon + Oxygen SG-AO-2 98/2
Argon + Helium SG-AHe-10 90/10
Argon + Hydrogen SG-AH-5 95/5
Helium + Argon + Carbon Dioxide SG-HeAC-7.5/2.5 90/7.5/2.5
Argon + Carbon Dioxide + Oxygen SG-ACO-8/2 90/8/2
Argon + Mixture SG-A-G Special

1 Like