Inert Shielding Gas
Inert welding shielding gas is a chemically unreactive gas like argon or helium that protects the melt from atmospheric oxidation. It is used in TIG and MIG welding of reactive metals.
Physical-Chemical Mechanism of Action
Inert welding shielding gas such as argon or helium is chemically unreactive and binds oxygen. It protects the melt from atmospheric oxidation, leading to a cleaner refinement.
Metallurgical Relevance & Risks in Welding
Without inert gas, the melt can oxidize and porosity can form. This leads to a weaker and less tough material. Wrong selection or lack of gas pressure can lead to incomplete refinement and increased stress concentration.
Shop Practice & Action Instructions
Use argon for steel and aluminum, helium for highly conductive materials. Ensure gas pressure is between 20 and 30 L/min and the shielding gas supply is continuous. Regularly check gas supply and gas quality.