When performing SMAW (stick welding) on a heavy equipment component, a technician observes frequent arc outages and an inconsistent weld bead despite maintaining a steady hand and proper electrode angle. The machine's amperage setting is correct for the electrode size. What is a likely cause of this issue?

Question: When performing SMAW (stick welding) on a heavy equipment component, a technician observes frequent arc outages and an inconsistent weld bead despite maintaining a steady hand and proper electrode angle. The machine's amperage setting is correct for the electrode size. What is a likely cause of this issue?

Answer options: ✅ Insufficient grounding

• Too high voltage setting
• Excessive travel speed
• Using an AC welder with an electrode designed for DC

Correct answer: Insufficient grounding

Explanation: Insufficient grounding is a common cause of frequent arc outages and an inconsistent weld bead in SMAW because it disrupts the electrical circuit. If the work clamp has poor contact or is connected to a painted or rusty surface, the current flow is interrupted. While other options can affect weld quality, poor grounding directly impacts arc stability. An AC welder with a DC electrode is a plausible problem, but not a general cause compared to insufficient grounding in general.