What is the typical shielding gas flow rate in cubic feet per hour (CFH) for Collision Repair welding?

What is the typical shielding gas flow rate in cubic feet per hour (CFH) for Collision Repair welding?

• A. 60-70
• B. 5-15
• C. 40-50
• D. 25-30

Answer: (D)

The shields gas flow for collision repair welding is kept in a moderate range to protect the weld without disturbing the shield. For MIG welding on automotive sheet metal, about 25–30 CFH provides enough shielding gas to cover the weld pool and prevent porosity, while not being so high that it creates turbulence or wastes gas. If the flow is too low, gaps in shielding allow air to contaminate the molten metal, causing porosity and oxidation. If the flow is too high, the gas can blow away from the weld or create air currents that pull air into the weld area, also compromising the shield and wasting gas. So, 25–30 CFH strikes a practical balance for collision repair welding on typical automotive panels.

The shields gas flow for collision repair welding is kept in a moderate range to protect the weld without disturbing the shield. For MIG welding on automotive sheet metal, about 25–30 CFH provides enough shielding gas to cover the weld pool and prevent porosity, while not being so high that it creates turbulence or wastes gas.

If the flow is too low, gaps in shielding allow air to contaminate the molten metal, causing porosity and oxidation. If the flow is too high, the gas can blow away from the weld or create air currents that pull air into the weld area, also compromising the shield and wasting gas.

So, 25–30 CFH strikes a practical balance for collision repair welding on typical automotive panels.