Which statement about spray transfer conditions is true?

• A. Globular transfer is the transfer mode used at lower current.
• B. The spray transfer transition current varies depending on wire type, diameter, and shielding gas composition.
• C. Push angle refers to the torch pointing toward the beginning of the weld as the bead is deposited.
• D. CO2 levels exceeding 50% do not allow spray transfer.

Answer: (B)

Spray transfer depends on having enough heat and a stable arc to create many fine droplets, and the current at which you switch into that spray mode isn’t fixed. It varies with the wire you’re using (its alloy and properties change how it melts and droplets form), the wire diameter (larger wires need more heat to reach spray conditions), and the shielding gas composition (gas affects arc stability and heat input). Because all three factors influence how easily the arc supports spray transfer, the transition current isn’t a constant value, making the statement that it varies with wire type, diameter, and shielding gas the true one.

The other ideas don’t fit as well. Globular transfer is a different transfer mode tied to lower heat input, not the spray mode. Push angle describes how the torch is oriented during deposition, not the conditions that govern spray transfer. And claiming that CO2 levels above 50% categorically prevent spray transfer oversimplifies the gas effects, which depend on the overall balance of current, voltage, and gas mix.