Inert Gas Shielding Welding
Inert gas welding uses inert shielding gases such as argon or helium to prevent oxidation and nitriding of the molten weld pool. This improves the quality of the weld and its mechanical properties.
Physicochemical mechanism of action
Inert gas welding uses inert gases such as argon or helium that do not cause chemical reactions with the metal. These gases shield the molten weld pool from oxygen and nitrogen, preventing oxidation and nitriding.
Metallurgical relevance & risks when welding
Without inert gas shielding, oxides and nitrides can form in the weld pool, leading to porosity and weak spots in the weld. This can impair the mechanical properties and service life of the component.
Workshop practice & instructions
Use a high-quality inert gas (e.g., argon) in the right amount (approx. 10-20 liters per kilogram of weld metal). Make sure the gas is directed well over the weld and no air pockets form. Constantly monitor the temperature and pressure of the gas.