A welder is carbon arc gouging a faulty weld in a heavy steel plate. They observe that the groove is shallow and wide, and the carbon electrode is overheating and crumbling at the tip. What is the most probable cause of these issues?

Question: A welder is carbon arc gouging a faulty weld in a heavy steel plate. They observe that the groove is shallow and wide, and the carbon electrode is overheating and crumbling at the tip. What is the most probable cause of these issues?

Answer options:

• Insufficient air pressure and excessive arc length.
• Excessive air pressure and insufficient amperage. ✅ Insufficient current and too long of a standoff distance.
• Excessive current and insufficient air pressure.

Correct answer: Insufficient current and too long of a standoff distance.

Explanation: A shallow, wide groove and overheating, crumbling electrodes suggest insufficient current for the electrode size or too long a standoff distance, which reduces the arc's penetrating power and efficiency. Excessive air pressure would likely result in an erratic or blown-out arc, while insufficient air pressure would lead to poor metal removal and an uncontrolled molten puddle.