Which parameter influences bead shape and stability?

Which parameter influences bead shape and stability?

• A. Current
• B. Shielding gas type
• C. Wire feed
• D. Travel speed

Answer: (C)

Wire feed rate controls how much filler metal is deposited into the weld pool each second, which directly shapes the bead and affects arc stability. When more filler metal is fed in, the bead tends to become wider and taller and can improve fusion, but if heat input isn’t balanced, it can cause spatter or an unstable arc. If the feed is too slow, the bead can be underfilled and uneven, indicating poor stability and fusion. Other factors like current, travel speed, and shielding gas influence heat and arc behavior, but the amount of metal delivered to the bead—the wire feed rate—has the most direct and primary effect on bead shape and stability.

Wire feed rate controls how much filler metal is deposited into the weld pool each second, which directly shapes the bead and affects arc stability. When more filler metal is fed in, the bead tends to become wider and taller and can improve fusion, but if heat input isn’t balanced, it can cause spatter or an unstable arc. If the feed is too slow, the bead can be underfilled and uneven, indicating poor stability and fusion. Other factors like current, travel speed, and shielding gas influence heat and arc behavior, but the amount of metal delivered to the bead—the wire feed rate—has the most direct and primary effect on bead shape and stability.