KP674-3/64A - Lincoln Electric 3/64" Aluminum Drive Roll Kit for SP-255/WM-255

Precision Feeding for Aluminum MIG Welding

The Lincoln Electric KP674-3/64A Drive Roll Kit is a specialized component manufactured to meet the rigorous demands of industrial aluminum welding. Designed explicitly for the SP-255 and Wire-Matic 255 (WM-255) power sources, this kit facilitates the reliable feeding of 3/64-inch (1.2 mm) aluminum wire. In MIG welding, the wire feeder is the heart of the mechanical operation, and when dealing with aluminum, the margin for error is slim. This kit replaces standard steel-compatible rolls with precision-machined rolls optimized for the lower column strength of aluminum filler metals.

Aluminum wire presents unique challenges due to its softness. Using incorrect drive rolls—such as those with serrated teeth or sharp V-grooves intended for flux-cored or solid steel wires—can deform the wire cross-section. This deformation increases friction within the liner and contact tip, leading to burn-backs and erratic feeding. The KP674-3/64A utilizes a smooth groove profile, typically a U-groove or polished V-groove design (specific to Lincoln's engineering for this kit), which provides adequate traction without biting into the metal. This ensures the wire remains round and feeds with minimal resistance, which is crucial for maintaining a constant voltage and amperage output during the weld.

For professional welders operating the Wire-Matic 255 or SP-255, maintaining the feed system is essential for productivity. Worn drive rolls or incorrect sizing can lead to slippage, causing the wire feed speed to fluctuate independently of the machine settings. This kit restores factory-spec performance for aluminum applications. It is manufactured to Lincoln Electric's high OEM standards, ensuring long service life and resistance to wear. The kit includes the necessary components to swap out the existing rolls, providing a dedicated solution for aluminum projects.

Technical reliability is the cornerstone of the Lincoln Electric brand. By utilizing the KP674-3/64A, operators can minimize the common headache of "birdnesting" at the feeder inlet. This allows for longer continuous welds and higher deposition rates, which are often required in production environments. Ensure your SP-255 or WM-255 is properly configured for every job by keeping this dedicated aluminum drive roll kit in your maintenance inventory.