Which mode of metal transfer is characterized by the transfer of metal in very fine droplets moving along the arc axis?

Which mode of metal transfer is characterized by the transfer of metal in very fine droplets moving along the arc axis?

• A. Short-Circuiting
• B. Globular
• C. Spray
• D. Pulsed Spray

Answer: (C)

The idea being tested is how metal moves from the electrode to the weld in GMAW, specifically the spray transfer mode. In spray transfer, the current is high enough to atomize the molten metal, and tiny droplets are formed that are ejected continuously along the arc axis toward the weld pool. These droplets are very small, uniform, and travel rapidly in a steady stream, which is why you see a fine mist of metal moving directly along the arc toward the weld. This differs from short-circuiting, where metal is transferred in larger droplets during frequent contact and separation events at the tip, often with less precise direction toward the weld. Globular transfer involves even larger, irregular droplets that aren’t guided along the arc axis. Pulsed spray is a variation of spray transfer that occurs with a pulsed current, but the description of very fine droplets moving along the arc axis most closely matches continuous spray transfer.

The idea being tested is how metal moves from the electrode to the weld in GMAW, specifically the spray transfer mode. In spray transfer, the current is high enough to atomize the molten metal, and tiny droplets are formed that are ejected continuously along the arc axis toward the weld pool. These droplets are very small, uniform, and travel rapidly in a steady stream, which is why you see a fine mist of metal moving directly along the arc toward the weld.

This differs from short-circuiting, where metal is transferred in larger droplets during frequent contact and separation events at the tip, often with less precise direction toward the weld. Globular transfer involves even larger, irregular droplets that aren’t guided along the arc axis. Pulsed spray is a variation of spray transfer that occurs with a pulsed current, but the description of very fine droplets moving along the arc axis most closely matches continuous spray transfer.