Which current polarity provides cleaning action in GTAW?

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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

Which current polarity provides cleaning action in GTAW?

Explanation:
In GTAW, cleaning action comes from how the arc interacts with the surface: energetic ions bombard the workpiece and disrupt or remove oxides, giving a clean metal surface for fusion. When the electrode is positive (current flows as electrode positive, workpiece becomes the negative side), the arc drives positive ions toward the workpiece. Those ions strike the surface, helping to dislodge oxide films and surface contaminants as the weld begins. This direct-current electrode-positive condition thus provides a reliable cleaning action, which is why it’s identified as the best choice for cleaning in GTAW.

In GTAW, cleaning action comes from how the arc interacts with the surface: energetic ions bombard the workpiece and disrupt or remove oxides, giving a clean metal surface for fusion. When the electrode is positive (current flows as electrode positive, workpiece becomes the negative side), the arc drives positive ions toward the workpiece. Those ions strike the surface, helping to dislodge oxide films and surface contaminants as the weld begins. This direct-current electrode-positive condition thus provides a reliable cleaning action, which is why it’s identified as the best choice for cleaning in GTAW.

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