Visual Testing (VT) Practice Exam

What is a common cause of arc strikes during welding?

1. Molten particles splashed out of the molten puddle.

2. Excessive heat during the welding process.

3. The use of improper or wet electrodes.

4. Welding operator error.

The correct answer is: Welding operator error.

A common cause of arc strikes during welding relates to the use of improper or wet electrodes. When electrodes are not suitable for the specific welding task or are contaminated with moisture, they can lead to unstable arcs. Wet electrodes can cause the arc to wander due to the additional moisture content, which disrupts the electrical arc stability. This instability can result in unintended strikes or arc wandering, leading to damage in unintended areas. Although operator error can contribute to the occurrence of arc strikes through improper handling or technique, the direct correlation with equipment quality and preparation, like the electrodes used, is often more critical in identifying the root cause of an arc strike. Understanding the importance of electrode condition and selection is vital for maintaining stable arcs during welding processes.