AC concentrates about ____ of its welding heat on the work and ____ on the tungsten.

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Prepare for the Gas Tungsten Arc Welding (GTAW) exam. Test your knowledge with multiple-choice and flashcard questions with hints and explanations to boost your confidence. Get ready to succeed!

Multiple Choice

AC concentrates about ____ of its welding heat on the work and ____ on the tungsten.

Explanation:
In GTAW with alternating current, the arc’s heat is shared between the weld work and the tungsten electrode, and it isn’t split evenly. Roughly two-thirds of the heat goes into the workpiece while about one-third goes into the tungsten. This happens because the workpiece is a much larger heat sink and requires more energy to reach welding temperatures, whereas the tungsten electrode is small, has high thermal conductivity, and is cooled by the surrounding gas and the electrode itself. So, even though the current alternates, the typical heat distribution ends up favoring the workpiece around a 2:1 ratio.

In GTAW with alternating current, the arc’s heat is shared between the weld work and the tungsten electrode, and it isn’t split evenly. Roughly two-thirds of the heat goes into the workpiece while about one-third goes into the tungsten. This happens because the workpiece is a much larger heat sink and requires more energy to reach welding temperatures, whereas the tungsten electrode is small, has high thermal conductivity, and is cooled by the surrounding gas and the electrode itself. So, even though the current alternates, the typical heat distribution ends up favoring the workpiece around a 2:1 ratio.

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