Which statement is true about transfer modes and current?

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)

When you think about how metal moves from the wire into the weld pool in GMAW, the current level and the wire size determine the transfer mode. Short-circuit transfer happens when the arc current is kept low and the wire diameter is small. Under these conditions the molten tip forms a tiny droplet that repeatedly touches and separates from the puddle, producing frequent short circuits. This combination—low current with a small-diameter wire—keeps the heat input low and works well for thin materials or when welding in tight positions.

That’s why the statement about short-circuit transfer being associated with lower current and smaller wires is the best choice. The other options conflict with how these modes actually behave: high current with large-diameter wires pushes you toward spray or globular transfer, not short-circuit; spray transfer relies on higher current and appropriate wire sizes (not the smallest typically), and shielding gas affects globular and spray transfer, so saying globular is unaffected by shielding gas isn’t correct.