Inert Gas
Inert gas like argon or helium protects the melt from oxidation and ambient gases. It improves weld quality, prevents porosity, and enhances mechanical behavior.
Physicochemical mechanism of action
Inert gases like argon or helium are chemically unreactive gases that do not react with other elements. They protect the molten pool from oxidation and reactions with ambient gases like oxygen or nitrogen. This prevents porosity formation in the weld.
Metallurgical relevance & welding risks
Without inert gas, oxides can form on the steel surface, compromising mechanical strength and weld tightness. This leads to porosity, cracks, and poor formability. Using inert gas ensures the weld is denser and more robust.
Workshop practice & action instructions
Use inert gas in the welding zone to prevent oxidation. For TIG welding, argon is typically used. Make sure the gas flow rate is between 5 and 10 liters per minute. Correct gas flow adjustment is crucial for high-quality welds.