Scheduled Maintenance

Maintenance will be performed on this website Thursday April 25th at 11:00am which may cause delays in page loading. If you experience issues, please check back later. Thank you for your patience and we apologize for any inconvenience.

What Shielding Gas Do I Need?

What Shielding Gas Do I Need?

The type of shielding gas that should be used depends on the metal being welded. A mixture of 75% argon and 25% CO2 is the recommended shielding gas for collision repair on mild and high-strength steels. Pure argon is used for welding aluminum and when welding steel with silicon bronze wire.

A mixture of 75% argon and 25% CO2 is the preferred gas for collision repair welding because it improves both the yield and tensile strength of the weld and helps produce a smooth, stable arc with little spatter. This mix also produces a small weld puddle that sets up quickly, making it a good choice when welding out of position.

Although pure CO2 shielding gas can reduce the amperage required to make a weld, it's not recommended for collision repair welding. This is because it penetrates too deeply on thin-gauge metal and makes an unstable arc that increases spatter. Because it makes a hotter weld, and a larger heat-affected zone, it is not recommended for welding high-strength steels.