Compared to short-circuit transfer, spray transfer in GMAW provides what characteristic?

• A. Lower deposition with rougher beads.
• B. Equal deposition and bead quality.
• C. Higher deposition with smoother beads.
• D. Only used for carbon steel.

Answer: (C)

Metal transfer mode in GMAW affects how much metal is deposited and how the bead looks. Spray transfer uses a high-current, continuous arc that atomizes the filler metal into a fine spray and carries it across the arc to the weld pool. Because the droplets are small and continuously transferred, you get a higher deposition rate and a very smooth, uniform bead as the droplets fuse with the base metal. In contrast, short-circuit transfer works at lower current and transfers metal in larger droplets with brief contacts, which tends to produce a rougher bead and lower deposition. So, compared to short-circuit transfer, spray transfer provides higher deposition with smoother beads. (Spray transfer requires appropriate shielding gas and material/thickness considerations and isn’t restricted to carbon steel.)