What is a characteristic of AC compared to DC in welding?

In welding, alternating current (AC) has distinctive characteristics compared to direct current (DC). One notable feature of AC is that it can be more hazardous than DC. This increased hazard can be attributed to several factors. During AC welding, the current alternates direction, which can cause frequent changes in the arc characteristics and the behavior of molten metal. This dynamic can lead to more complex exposure to electricity and can also create additional risks such as electric shock if proper safety precautions are not taken.

Additionally, because AC can induce more arc instability, it requires the welder to maintain a very cautious approach to prevent accidents. Factors such as the presence of moisture or the use of improper gear can further amplify the risks associated with AC compared to DC, which tends to provide a more consistent current flow and arc stability.

The other options present traits that might seem plausible in certain contexts but do not adequately address the fundamental hazards associated with AC welding. It is essential for welders to be aware of these hazards and to take appropriate safety measures to minimize risks while working.