What is the typical shielding gas flow rate setting for MIG welding?

What is the typical shielding gas flow rate setting for MIG welding?

• A. 5–10 CFH
• B. 20–25 CFH
• C. 50–60 CFH
• D. 100–120 CFH

Answer: (B)

Shielding gas flow rate is about keeping a stable protective blanket over the weld. For a typical MIG weld with common gas mixtures, about 20–25 CFH provides the right balance: enough gas to displace air and prevent porosity, but not so much that the flow becomes turbulent or wastes gas. If the flow is too low (around 5–10 CFH), shielding may be inadequate and porosity can form from air intrusion. If the flow is too high (around 50–60 or 100–120 CFH), the gas can blow away from the weld and create turbulent conditions, also wasting gas and potentially compromising shielding. So 20–25 CFH is the practical, general setting for normal MIG welding.

Shielding gas flow rate is about keeping a stable protective blanket over the weld. For a typical MIG weld with common gas mixtures, about 20–25 CFH provides the right balance: enough gas to displace air and prevent porosity, but not so much that the flow becomes turbulent or wastes gas. If the flow is too low (around 5–10 CFH), shielding may be inadequate and porosity can form from air intrusion. If the flow is too high (around 50–60 or 100–120 CFH), the gas can blow away from the weld and create turbulent conditions, also wasting gas and potentially compromising shielding. So 20–25 CFH is the practical, general setting for normal MIG welding.