SHIELDING GASES FOR GMAW WELDING
SHIELDING GASES
The primary function of shielding gas is to protect molten weld metal from atmosphere. the shielding gas & flow rate also have effect on the following
- Arc characteristics
- Mode of metal transfer
- Penetration & weld bead profile
- Speed of welding
- Undercutting tendency
- Cleaning action
- Weld metal mechanical properties
TYPES OF SHIELDING GASES
- CARBON DIOXIDE
- ARGON – CO2
- ARGON – O2
Typical bead profiles for argon, helium, argon-helium, & CO2
USES OF DIFFERENT SHIELDING GASES FOR GMAW
