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The overcurrent protection system in welders is designed to safeguard the equipment and the user from excessive electrical current that could lead to damage or hazardous situations. This system plays a crucial role in maintaining the integrity and safety of the welding process. When the current exceeds a predetermined limit—an overload condition—the overcurrent protection system automatically shuts off the power to prevent overheating and potential failure of the welder. This feature is vital because it ensures that the welder can operate safely without risking equipment damage or safety concerns for the operator.

The other options, while related to welding operations, do not represent the primary function of the overcurrent protection system. A constant voltage output refers to the welding arc's quality rather than safety features. Arc stability pertains to maintaining a consistent arc during the welding process, and controlling gas feed pressure is relevant in gas welding setups, but none of these directly address overcurrent protection.