K471-4 - Magnum 400 Semiautomatic MIG Gun 15ft .052-1/16

Heavy-Duty Reliability with the Lincoln Magnum 400

The Lincoln Electric Magnum® 400 Gun (K471-4) is a premier choice for professional fabricators requiring a robust semiautomatic MIG welding solution. Engineered to handle high-amperage applications, this air-cooled gun is rated for 400 amps at a 60% duty cycle using CO2 gas. It is specifically configured with a liner and contact tip setup to accommodate larger wire diameters ranging from .052 inches to 1/16 inches (1.3-1.6 mm), making it an excellent tool for structural steel, heavy equipment manufacturing, and industrial fabrication where deposition rates are critical.

One of the standout aspects of the Magnum 400 series is its construction quality. The gun features a longer gooseneck and a cable with a higher copper strand count than the smaller Magnum 300, ensuring superior electrical conductivity and heat dissipation. The gun tube is armored with an electrically insulated metal jacket, which not only protects the internal components but also optimizes fine wire welding performance by maintaining rigidity and alignment. Furthermore, the cable itself is encased in an abrasion-resistant, extruded rubber jacket. This rugged exterior adds significant strength, preventing wear and tear from dragging across shop floors or around sharp metal edges, thereby extending the service life of the assembly.

Maintenance and downtime are minimized thanks to the thoughtful design of the expendable parts. The Magnum 400 utilizes a one-piece modular trigger assembly molded from high-heat-resistant material. This design withstands the intense radiant heat and spatter common in 400A welding procedures, ensuring long life and consistent electrical signals. Should the trigger eventually need service, the modular design allows for quick and easy replacement without disassembling the entire handle. The internal extruded tube offers excellent gas sealing integrity, preventing leaks and ensuring shielding gas coverage remains consistent for high-quality welds.

Operator comfort is paramount in the design of the K471-4. The classic curved handle is lightweight and balanced, providing a sure, confident grip that reduces hand fatigue during long welding shifts. The rotatable gooseneck is a practical feature that allows welders to adjust the angle of the gun tube, facilitating easier access to tight spaces or awkward joint locations without forcing the welder into uncomfortable positions. Whether you are running solid MIG wire or gas-shielded flux-cored wires (UltraCore or Metalshield), the Lincoln Magnum 400 delivers the performance and durability required for demanding industrial environments.