Which polarity concentrates most heat on the workpiece?

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Study for the GMA Welding for Collision Repair. Prepare with multiple-choice questions, flashcards, hints, and detailed explanations. Enhance your skills and confidently tackle your exam!

Multiple Choice

Which polarity concentrates most heat on the workpiece?

Explanation:
In GMAW, how heat is deposited depends on polarity. With straight polarity, the electrode is negative and the workpiece is positive. The current entering the base metal causes most of the resistive heating to occur there, so the bulk of the arc heat concentrates in the workpiece. This yields deeper penetration into the base metal while keeping the electrode cooler and reducing wear. In contrast, reverse polarity puts more heat into the electrode, and pulsed or neutral modes don’t specifically prioritize heat into the workpiece the same way straight polarity does.

In GMAW, how heat is deposited depends on polarity. With straight polarity, the electrode is negative and the workpiece is positive. The current entering the base metal causes most of the resistive heating to occur there, so the bulk of the arc heat concentrates in the workpiece. This yields deeper penetration into the base metal while keeping the electrode cooler and reducing wear. In contrast, reverse polarity puts more heat into the electrode, and pulsed or neutral modes don’t specifically prioritize heat into the workpiece the same way straight polarity does.

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