Question

what type of welding power supply is required for gtaw?

constant current
constant voltage
none of these
constant power

Explanation:

Identify the welding process characteristics

Using the GTAW Definition knowledge point, Gas Tungsten Arc Welding (GTAW), also known as TIG welding, is a manual welding process where the welder controls the arc length manually. In manual processes, small changes in the distance between the electrode and the workpiece cause fluctuations in arc voltage.

Determine the required power source type

Using the Constant Current knowledge point

$$ \Delta I \approx 0 \quad \text{when} \quad \Delta V \text{ occurs} $$

To maintain a stable weld pool and prevent excessive current fluctuations when the welder's hand moves, a constant current (CC) power supply is required. This ensures the welding current remains relatively stable even if the arc length (and thus arc voltage) varies.

Answer:

• Constant Current (Correct answer)
• Constant Voltage
• None of these
• Constant Power