K471-15 - Lincoln Magnum 400 MIG Gun, 400A, 25 ft, 1/16-5/64 in

Heavy-Duty Performance for High-Amperage Applications

The Lincoln Electric Magnum 400 MIG Gun (K471-15) is an industrial-grade semiautomatic welding gun designed for fabrication environments requiring sustained high-amperage output. Rated at 400 amps with a 60% duty cycle using CO2 gas, this air-cooled gun bridges the gap between standard medium-duty equipment and heavy water-cooled systems. It is specifically engineered to manage the greater heat levels generated during high-deposition welding, making it an ideal choice for structural steel, heavy equipment manufacturing, and general fabrication.

Optimized Cable and Liner Configuration

This specific configuration features a generous 25-foot cable assembly, providing operators with a significant range of motion around large workpieces without moving the wire feeder. The gun comes pre-installed with a liner accommodating wire diameters from 1/16 inch to 5/64 inch, targeting heavier wire applications often found in flux-cored and spray transfer MIG welding. The cable itself is protected by an abrasion-resistant, extruded rubber jacket that adds substantial strength and longevity, resisting cuts and burns common on the shop floor. Internally, the cable utilizes a high copper strand count to efficiently conduct the 400A current while maintaining flexibility.

Ergonomics and Durability

Operator comfort is paramount in the design of the Magnum 400. It features Lincoln's classic curved handle, which is lightweight and balanced to provide a sure, confident grip. This ergonomic shape helps distribute weight evenly, significantly reducing operator fatigue during long welding shifts. The gun tube is armored with an electrically insulated metal jacket, optimizing fine wire welding performance and protecting the gooseneck from impact. Additionally, the gooseneck is rotatable, allowing the welder to adjust the angle of approach for tight spaces or awkward joint locations without straining their wrist.

Maintenance and Serviceability

Maintenance is streamlined with the Magnum 400's modular design. The one-piece trigger assembly is molded from high-heat-resistant material to withstand spatter and ensure a long service life. Inside, high-quality silver contacts provide clean electrical signals for reliable arc initiation. The gun utilizes standard Magnum expendable parts—contact tips, gas diffusers, and nozzles—that are widely available and compatible with other leading brands, ensuring that keeping the gun operational is cost-effective and convenient. The rugged strain relief system at the feeder end further enhances feedability by preventing acute cable angles that could bind the liner.