AWS Welding Inspection and Testing Certification Practice Test

What happens if an electrode is touched to a metal surface other than the work piece?

1. The machine will disable itself

2. It may cause an explosion

3. Those surfaces may become electrically live

4. It may result in a weld defect

The correct answer is: Those surfaces may become electrically live

When an electrode is touched to a metal surface other than the intended work piece, there is a risk that those surfaces may become electrically live due to the conductivity of the material. In welding applications, particularly those involving electric arc processes, the electrode carries a significant electrical current. If the electrode comes into contact with another conductive surface, that surface can complete the electrical circuit, potentially leading to unintentional energization. This situation poses several hazards, such as electrical shock to personnel nearby and the risk of damaging equipment. Additionally, if a non-intended surface becomes energized, it can lead to unpredictable arc behavior, creating a safety risk for anyone in proximity to the equipment. While other options might touch on consequences related to equipment or defects, they do not fully capture the immediate risk associated with unintended electrical contact. Hence, the response regarding surfaces becoming electrically live is the most accurate and relevant to the situation described.