What is the heat distribution with AC welding current?

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Prepare for the GTAW Advanced Welding Exam. Use flashcards and multiple choice questions, each with hints and detailed explanations. Excel in the exam!

Multiple Choice

What is the heat distribution with AC welding current?

Explanation:
With AC TIG, the current polarity reverses in each half-cycle, so heat is deposited into both the electrode and the workpiece over time. One half-cycle concentrates more heat in the workpiece, the other concentrates more heat in the electrode. Because these half-cycles are of roughly equal duration, the heat input averages out to about half to the electrode and half to the work. In practice, this ~50/50 distribution is the typical expectation for AC, though shifting the AC balance toward more electrode-positive time can tilt heat toward the electrode.

With AC TIG, the current polarity reverses in each half-cycle, so heat is deposited into both the electrode and the workpiece over time. One half-cycle concentrates more heat in the workpiece, the other concentrates more heat in the electrode. Because these half-cycles are of roughly equal duration, the heat input averages out to about half to the electrode and half to the work. In practice, this ~50/50 distribution is the typical expectation for AC, though shifting the AC balance toward more electrode-positive time can tilt heat toward the electrode.

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