KP2745-072R-B100 - Lincoln Magnum PRO 550A Contact Tip .068-.072 Copper Plus (100-Pack)

Advanced Thermal Management for High-Amperage Welding

The Lincoln Electric KP2745-072R-B100 is a premium contact tip designed for the rigorous demands of industrial MIG and flux-cored welding. Part of the Magnum® PRO consumable series, this contact tip is engineered to address the primary failure mode of welding consumables: thermal degradation. At high amperages, specifically up to 550A, standard copper tips often soften, leading to keyholing, micro-arcing, and eventual fusion with the welding wire. The KP2745-072R-B100 utilizes Lincoln Electric's proprietary Copper Plus® technology, a specialized alloy formulation that significantly enhances thermal conductivity. This material property allows the tip to dissipate heat generated at the arc transfer point much more rapidly than standard copper grades, maintaining structural integrity over prolonged duty cycles.

Precision Geometry and Electrical Conductivity

Beyond material composition, the physical geometry of the KP2745-072R-B100 is optimized for electrical efficiency. The tip features a larger mass compared to conventional designs, acting as a more effective heat sink while providing a greater cross-sectional area for current transfer. This ensures consistent arc starts and stable arc performance, which is critical for automated or high-production manual environments. The bore diameter is precision-machined to accommodate wire sizes ranging from 0.068 to 0.072 inches (1.7 to 1.8 mm). This specific tolerance range is ideal for specialized cored wires or heavy-gauge solid wires where feedability and electrical contact must be balanced perfectly to prevent micro-arcing within the tip bore.

Magnum® PRO System Compatibility

Designed exclusively for the Magnum® PRO platform, these contact tips integrate seamlessly with Lincoln's gas diffusers and nozzles. The interface between the tip and the diffuser is critical; the KP2745-072R-B100 features robust threading that resists seizing, even after exposure to the extreme thermal cycling inherent in 550A welding procedures. This secure connection ensures maximum electrical conductivity from the gun cable to the wire, minimizing voltage drop and resistive heating at the connection point. For industrial operations utilizing Lincoln Electric's semi-automatic or robotic systems, the consistency provided by the Copper Plus® alloy translates directly to improved weld quality and reduced troubleshooting time.

Bulk Efficiency for Heavy Fabrication

Supplied in a bulk pack of 100, this SKU is intended for high-volume fabrication environments where consumable inventory management is key to operational efficiency. By standardizing on the extended-life Copper Plus® tips, facilities can reduce the frequency of line stoppages for tip changes. The extended lifespan of these tips—often lasting significantly longer than standard copper equivalents—combined with the bulk packaging, offers a favorable cost-to-performance ratio for heavy equipment manufacturing, structural steel fabrication, and shipbuilding applications.