Which polarity is suitable for use with an ER80S-3 electrode?

The use of DC positive polarity is suitable for an ER80S-3 electrode when performing gas metal arc welding (GMAW). This electrode is typically designed for welding high-strength low-alloy steels and utilizes a wire that is primarily composed of a carbon-manganese blend, which is better suited for the conditions created by DC positive.

Using DC positive polarity, the electrode experiences a more stable arc and improved penetration due to the direction of the current. This enhances the heat input into the weld puddle, allowing for better fusion and overall weld quality, particularly important for high-strength applications. The positive polarity draws the current into the electrode, which contributes to a more manageable arc and better control over the welding process.

This choice aligns with the welding parameters recommended in welding codes and standards, ensuring the integrity and performance of the weld in structural applications.