Table 2 Chemical and physical properties of gases used in pulsed current NG-GMAW
Shielding gas | Density at 15 ℃ 1 bar (kg/m3) | Dissociation energy (eV/molecule) | First ionization energy (eV/molecule) | Chemical activity |
|---|---|---|---|---|
Ar | 1.669 | 0 | 15.8 | Inert |
CO2 | 1.849 | 4.3 | 14.4 | Oxidizing |
O2 | 1.337 | 5.1 | 13.6 | Oxidizing |