Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam

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What is the primary hazard of attaching a welding machine's work clamp (ground clamp) to a building's water pipe instead of directly to the workpiece or welding table?

The pipe will act as a capacitor and store dangerous high-voltage electrical charge. It can cause stray currents to damage pipe joints, create electric shock hazards elsewhere, or start a fire. The welding machine's rectifier will instantly burn out due to reverse polarity. It causes the welding arc to become extremely cold and unstable.

Correct Answer:

It can cause stray currents to damage pipe joints, create electric shock hazards elsewhere, or start a fire.

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