In spray transfer, which condition favors spray transfer?

• A. Higher current and appropriate shielding gas
• B. Low current and high voltage
• C. Moderate current with no shielding gas
• D. Very low wire feed rate

Answer: (D)

Spray transfer happens when enough heat is put into the weld so the arc can vaporize and atomize the filler metal into a fine, continuous spray of droplets. This requires relatively high welding current and a shielding gas that stabilizes the arc and prevents oxidation. With a shielding gas that's properly chosen, the arc remains stable and the droplets transfer smoothly across the arc.

Using a very low wire feed rate undermines spray transfer because there isn’t enough material input and heat to maintain a dense, continuous spray; the process tends to shift toward globular or short-circuit transfer. Likewise, insufficient current or lack of shielding gas would also destabilize spray transfer.