Question

why would a welder use the high - frequency start function in gtaw? a to cool the torch after use b to increase amperage during the weld c to reduce shielding gas flow d to protect the electrode from contamination

Explanation:

GTAW (Gas Tungsten Arc Welding) uses a non-consumable tungsten electrode. High-frequency start creates an arc without touching the electrode to the workpiece, preventing electrode contamination from contact with base metal or impurities. Cooling the torch, adjusting amperage, or reducing shielding gas flow are unrelated to this function.

Answer:

D. to protect the electrode from contamination