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

Classic Comfort Meets High-Amperage Power

For welders who demand both power and comfort, the Lincoln Electric Magnum® 400 Welding Gun (K471-4) delivers a proven solution. This 15-foot gun assembly is designed to bridge the gap between medium-duty ease of use and heavy-duty performance capability. Rated at 400 amps with a 60% duty cycle, it is built to withstand the greater heat levels generated by higher amperage applications while keeping the operator comfortable. This specific model comes ready to feed .052" to 1/16" diameter wires, making it ideal for heavy fabrication jobs that require substantial weld metal deposition.

The Magnum 400 features Lincoln's signature classic curved handle. This ergonomic design has been a favorite among industry professionals for years because it fits naturally in the hand, providing excellent balance and control. By reducing the physical strain on the wrist and forearm, this gun allows operators to maintain precision and focus over extended periods of welding. The handle also houses a high-quality, one-piece modular trigger assembly. Unlike flimsier triggers that can melt or fail under heavy spatter, this trigger is molded from heat-resistant materials and features silver contacts for reliable arc initiation every time.

Durability is built into every inch of the K471-4. The gun tube is protected by an electrically insulated metal jacket that reflects radiant heat and resists abrasion. The power cable is protected by a tough, extruded rubber jacket that resists cuts, burns, and abrasion common in busy workshops. This robust strain relief system increases feedability by preventing acute angles at the gun connection, protecting the liner and ensuring smooth wire delivery. The gun also features a rotatable gooseneck, giving you the flexibility to attack welds from the best possible angle, ensuring high-quality bead profiles even in restricted areas.

The Magnum 400 is versatile enough for a wide range of gas-shielded operations, including MIG and flux-cored welding. It uses standard Lincoln Electric expendable parts—contact tips, nozzles, and diffusers—that are widely available and easy to swap out. The internal tube design ensures gas sealing integrity, which is critical for preventing porosity in welds. If you are looking for a welding gun that combines the ruggedness needed for 400-amp work with the handling characteristics of a lighter gun, the Lincoln Magnum 400 is the industry standard for performance and value.