K470-4 - Lincoln Electric Magnum 300 MIG Gun, 300A, 15 ft, .052-1/16 Liner

Industrial Grade Semiautomatic MIG Gun

The Lincoln Electric Magnum 300 Welding Gun (K470-4) is a robust solution designed for semi-automatic MIG and flux-cored welding applications. Engineered for durability and performance, this air-cooled gun is rated at 300 amps with a 60% duty cycle when using CO2 gas. It is specifically configured with a liner and contact tip setup to handle larger wire diameters ranging from 0.052 inches to 1/16 inches (1.3 - 1.6 mm), making it an excellent choice for heavy fabrication and structural welding tasks where higher deposition rates are required.

Rugged Construction for Harsh Environments

Lincoln Electric has built the Magnum 300 series to withstand the tough conditions of job shops, production lines, and manufacturing facilities. 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. The cable itself is encased in an abrasion-resistant, extruded rubber jacket that adds significant strength and longevity, preventing cuts and wear from dragging across shop floors or around sharp metal edges.

Maintenance and Serviceability

Minimizing downtime is critical in industrial settings. The K470-4 features a one-piece modular trigger assembly molded from high-heat-resistant material. This design withstands head and spatter to ensure a long operational life and utilizes high-quality silver contacts for clean electrical signals. When maintenance is required, the modular nature of the components allows for quick replacements. Additionally, the gun features a rugged strain relief system that enhances feedability by reducing acute cable angles, thereby protecting the liner and ensuring smooth wire delivery.

Ergonomics and Control

Operator fatigue can significantly impact weld quality. The Magnum 300 utilizes Lincoln's classic curved handle design, which is lightweight and balanced to provide a comfortable grip during extended welding sessions. The rotatable gooseneck (60-degree angle) further enhances versatility, allowing welders to adjust the gun angle to access tight spaces or awkward joint locations without compromising the weld bead profile.