Excessively high voltage leads to which effects?

Excessively high voltage leads to which effects?

• A. A bead that is hat shaped; difficult slag removal; excessive pickup of alloys, esp in multipass welds which can cause cracks
• B. Lower heat input
• C. Longer welding time
• D. No effect

Answer: (A)

Excessive arc voltage increases the arc length, which raises the heat input into the weld pool. That extra heat makes the weld bead form differently: it tends to become more convex and can look hat-shaped because the molten metal stays liquid longer and spreads outward rather than settling smoothly. The higher heat also changes how the slag behaves—slag can become heavier and harder to remove, sticking to or entangling with the weld bead and making cleaning more difficult. In multipass welds, the increased heat promotes more dilution and alloy transfer from the base metal and filler into the earlier passes, altering the weld chemistry and raising the risk of cracking due to brittle phases or residual stresses. So these combined effects are a direct consequence of too much voltage. The other options describe opposite or unrelated outcomes, like lower heat input, longer welding time, or no effect.

Excessive arc voltage increases the arc length, which raises the heat input into the weld pool. That extra heat makes the weld bead form differently: it tends to become more convex and can look hat-shaped because the molten metal stays liquid longer and spreads outward rather than settling smoothly. The higher heat also changes how the slag behaves—slag can become heavier and harder to remove, sticking to or entangling with the weld bead and making cleaning more difficult. In multipass welds, the increased heat promotes more dilution and alloy transfer from the base metal and filler into the earlier passes, altering the weld chemistry and raising the risk of cracking due to brittle phases or residual stresses. So these combined effects are a direct consequence of too much voltage. The other options describe opposite or unrelated outcomes, like lower heat input, longer welding time, or no effect.