K4521-2-10-45 - Lincoln Magnum PRO 400 Water-Cooled MIG Gun, 10ft, 400A, Lincoln Connector

Heavy-Duty Water-Cooled Performance

The Lincoln Electric Magnum PRO 400 Water-Cooled MIG Gun (K4521-2-10-45) is engineered for the most demanding industrial welding environments. Designed to operate at a 100% duty cycle at 400 amps using mixed gas, this gun allows for continuous welding without the risk of overheating. It is the ideal solution for heavy fabrication shops, structural steel manufacturing, and automated welding cells where downtime is not an option. The water-cooling system efficiently dissipates heat, keeping the front-end consumables and the handle cool, which significantly improves operator comfort and consumable longevity.

Magnum PRO Consumable Technology

One of the standout features of this welding gun is its utilization of Lincoln's Magnum PRO consumables. The included Copper Plus contact tips feature a larger diameter and greater mass compared to standard tips. This design improves heat dissipation, keeping the tip cooler and preventing the wire from fusing or burning back. As a result, welders experience fewer tip changes, reduced arc instability, and lower overall operating costs. The secure nozzle design further enhances performance by ensuring consistent gas coverage and resisting spatter buildup.

Ergonomics and Durability

Operator fatigue is a critical factor in high-volume welding. The Magnum PRO 400 addresses this with a soft rubber over-molded handle that provides a secure, comfortable grip. The balanced design of the gun, combined with the flexibility of the 10-foot cable assembly, allows for easy maneuvering around large workpieces. The gun tube is angled at 45 degrees, offering optimal access to joints while maintaining a natural wrist position. Built to withstand the rigors of the shop floor, the cable and connections are reinforced to resist abrasion and impact.

Ready for Lincoln Systems

This specific model comes pre-configured with the K466-10 gun connector kit, making it ready to plug and play with compatible Lincoln Electric wire feeders. The package includes everything needed to get started, including a diffuser, insulator, contact tip, nozzle, and liner. Whether you are upgrading your current equipment or outfitting a new welding station, the Magnum PRO 400 delivers the reliability and performance synonymous with the Lincoln Electric brand.