What is one effect of increasing arc voltage in FCAW?

• A. It lengthens the arc and widens the bead
• B. It reduces bead width
• C. It decreases spatter
• D. It decreases heat input

Answer: (A)

Increasing arc voltage in FCAW mainly increases the arc length and the energy delivered to the weld pool. A longer arc means the heat spreads over a larger area, so the molten metal can flow and spread more before solidifying. That extra heat and spread produce a bead that is wider on the surface. While higher voltage also raises heat input (if current is held constant), the key observable effect described here is the longer arc and wider bead. This is why the most accurate statement is that increasing arc voltage lengthens the arc and widens the bead.