What is the purpose of a flow meter?

• A. To regulate current
• B. To measure gas purity
• C. To maintain a constant flow of gas
• D. To adjust wire feed speed

Answer: (C)

The flow meter’s job is to measure and control how much shielding gas is delivered to the weld area, so you can keep a steady, constant flow. This steady shielding protects the molten weld from air and prevents defects like porosity and oxidation. It isn’t used to regulate electrical current, test gas purity, or control wire feed speed, which is why the best answer is that it maintains a constant gas flow. In practice, you set a desired flow rate and the meter helps keep that rate steady throughout the weld.