schutzgas
Schutzgas, or shielding gas, is a non-consumable gas used during welding to shield the weld pool and surrounding metal from atmospheric gases such as oxygen, nitrogen, and water vapor. The protective atmosphere prevents oxidation, porosity, and other weld defects, helping to maintain mechanical properties and appearance. Shielding gas is delivered through a gas nozzle around the arc and filler metal, with the composition and flow rate chosen according to the process, material, and joint design.
Common shielding gases include inert gases such as argon and helium, as well as active gases such
In practice, shielding gas is supplied from cylinders with regulators and connected to the welding torch or