What does a gas regulator do in MIG welding?

In MIG welding, a gas regulator is essential for maintaining the correct shielding gas flow to the weld area. It ensures that the shielding gas, which protects the weld pool from contamination by atmospheric gases, is delivered at a consistent and controlled pressure. This regulation is crucial because fluctuations in gas pressure can lead to inadequate shielding, resulting in poor weld quality, increased spatter, or even weld defects. By keeping the pressure stable, the gas regulator allows the welder to focus on other aspects of the welding process without worrying about gas flow variations that could compromise the integrity of the weld.