Question

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Explanation:

Analyze aluminum welding requirements

Using the GTAW Definition and Alternating Current knowledge points

• Aluminum welding requires alternating current (AC) to break up the heavy surface oxide layer while maintaining adequate penetration.
• Conventional (non-inverter) magnetic-transformer GTAW power sources rely on the incoming line frequency to generate this AC output.

Evaluate input power phase limitations

Using the Welding Power Sources knowledge point

• Conventional transformer-rectifier power supplies designed for AC TIG welding must operate on single-phase input power.
• Three-phase power cannot be directly transformed into a standard single-phase AC welding arc using conventional transformer designs without sophisticated inverter electronics.
• Therefore, conventional AC GTAW machines are limited to single-phase power, making the statement false.

Answer:

• True
• False (Correct answer)