What does the voltage setting on the welding machine control in the GMAW process?

• A. Arc length and shape of the weld bead
• B. Wire feed rate
• C. Travel speed
• D. Shielding gas flow

Answer: (A)

Voltage sets the electrical potential of the arc, which determines how far the arc sits from the tip to the workpiece. A higher voltage lengthens the arc, making the weld bead wider and flatter, while a lower voltage shortens the arc, producing a tighter bead with different shape and penetration. So, the voltage dial is the main control for arc length and the resulting bead geometry in GMAW. The other settings influence how much filler metal is deposited, how quickly you move the torch, and how well the weld is shielded, but they don’t directly set the arc length.