What impact does shielding gas have on MIG welding?

Shielding gas plays a crucial role in MIG welding by protecting the molten weld pool from contamination by atmospheric elements such as oxygen, nitrogen, and moisture. When welding, the weld pool is exposed to these elements, which can lead to defects such as porosity, oxidation, and weakened welds. The shielding gas, typically a mix of argon and carbon dioxide, forms a protective envelope around the weld area, allowing for a clean and strong bond as the molten metal fuses and solidifies. This ensures the integrity and quality of the weld, which is essential for achieving strong and durable joints in various applications.