In order for spray transfer to occur, CO2 levels cannot exceed what percent?

In order for spray transfer to occur, CO2 levels cannot exceed what percent?

• A. 10%
• B. 25%
• C. 40%
• D. 60%

Answer: (B)

Spray transfer relies on a stable, highly atomized arc and the right shielding gas to keep many small droplets forming and being pushed out of the weld pool. The shielding gas composition matters: argon-rich mixtures promote smooth, fine atomization, while CO2 affects arc stability and droplet size. If the CO2 content stays under about a quarter of the shielding gas, spray transfer can occur. Once CO2 climbs above roughly 25%, the arc characteristics change and the process tends toward globular transfer with larger droplets and more spatter. In practice, spray transfer for steel is typically achieved with argon-rich mixtures (often about 75–90% Ar) and CO2 up to around 10–25%.

Spray transfer relies on a stable, highly atomized arc and the right shielding gas to keep many small droplets forming and being pushed out of the weld pool. The shielding gas composition matters: argon-rich mixtures promote smooth, fine atomization, while CO2 affects arc stability and droplet size. If the CO2 content stays under about a quarter of the shielding gas, spray transfer can occur. Once CO2 climbs above roughly 25%, the arc characteristics change and the process tends toward globular transfer with larger droplets and more spatter. In practice, spray transfer for steel is typically achieved with argon-rich mixtures (often about 75–90% Ar) and CO2 up to around 10–25%.