Which statement is true about transfer modes and current?

• A. Short circuiting transfer occurs at high current and large diameter wires.
• B. Short circuiting transfer occurs at lower current and smaller diameter wires.
• C. Spray transfer occurs with the smallest wire diameters.
• D. Globular transfer is unaffected by shielding gas.

Answer: (B)

In GMAW, how metal transfers from the wire to the weld pool depends on current level, wire diameter, and shielding gas. Short-circuit transfer happens at lower current and with smaller-diameter wires because the molten tip can touch the workpiece and repeatedly form a short, transferring small droplets with each cycle. The low energy per cycle keeps the process stable and allows easy re-ignition of the arc as the wire separates, which is typical for small-diameter wires operated at low current.

Spray transfer, by contrast, needs higher current and larger-diameter wires, producing a fine spray of small droplets rather than the short, globular bridging seen in short-circuit transfer. Globular transfer is influenced by shielding gas type; it’s not immune to gas effects, so the statement that shielding gas has no effect isn’t accurate.

So the statement that short-circuit transfer occurs at lower current and smaller diameter wires is the best fit.