KP2745-564R - Lincoln KP2745-564R Magnum PRO Copper Plus Contact Tip 5/64" 550A (10-Pack)

Technical Specification and Engineering Overview

The Lincoln Electric KP2745-564R is a high-performance contact tip engineered specifically for the Magnum® PRO series of MIG welding guns. Designed to accommodate 5/64-inch (2.0 mm) welding wire, this consumable is rated for high-amperage applications up to 550A. The defining characteristic of this component is the integration of Lincoln's proprietary Copper Plus™ technology. This design methodology involves a physical increase in the diameter of the contact tip, thereby increasing the total copper mass available for thermal management. By increasing the thermal mass, the tip is capable of dispersing arc heat more efficiently than standard diameter tips, maintaining a lower operating temperature during prolonged welding cycles.

Material composition is a critical factor in the performance of the KP2745-564R. It is manufactured from Copper Chrome Zirconium (CuCrZr), an alloy chosen for its superior hardness and resistance to annealing at elevated temperatures compared to standard Electrolytic Tough Pitch (ETP) copper. This resistance to softening ensures that the tip orifice maintains its dimensional integrity over time, preventing the "keyholing" effect that leads to erratic arc transfer and poor wire targeting. The tighter tolerances on the internal diameter (ID) further enhance electrical conductivity and arc stability, making this tip highly suitable for precision applications, including robotic automation where tool center point (TCP) repeatability is paramount.

A significant mechanical feature of this contact tip is the Anti-Seize™ threading. In high-heat environments, thermal expansion can cause standard threads to lock or fuse with the gas diffuser, necessitating the replacement of the entire front-end assembly. The KP2745-564R utilizes a specialized thread profile that accommodates thermal expansion and prevents galling, ensuring that tips can be removed and replaced easily. This "Extended Life" variant is empirically tested to feed an average of 20 lbs. more wire over its lifespan compared to standard Magnum PRO tips, representing a measurable increase in operational efficiency and a reduction in consumable turnover frequency.