K684-12 - Lincoln Magnum 450WC Water-Cooled MIG Gun, 15ft, 450A

Heavy-Duty Industrial Performance

The Lincoln Electric Magnum 450WC (K684-12) is a premium water-cooled MIG welding gun designed to meet the rigorous demands of heavy fabrication and industrial manufacturing. Engineered for high-amperage applications, this gun is rated at 450 amps at 100% duty cycle when using CO2 shielding gas. Its water-cooled architecture ensures consistent operating temperatures, preventing overheating during long weld cycles and extending the lifespan of consumables.

Robust Construction & Durability

Built to withstand the toughest shop environments, the Magnum 450WC features an abrasion-resistant, extruded rubber jacket that protects the power cable, water lines, and gas hose from cuts, burns, and general wear. The gun tube itself is armored with an electrically insulated metal jacket, a superior design choice compared to softer insulation materials that degrade over time. Additionally, the gun tube is buffed to a high shine, serving a functional purpose by reflecting radiant heat away from the front end and the operator's hand.

Precision & Compatibility

This model comes equipped with a 15-foot cable assembly and is set up for wire sizes ranging from 0.035 to 0.045 inches (0.9–1.2 mm). The internal extruded tube design offers excellent gas sealing integrity, ensuring shielding gas is delivered efficiently to the weld pool without leaks. The Magnum 450WC utilizes standard Lincoln Magnum expendable parts, making it easy to source contact tips, nozzles, and diffusers. It is also compatible with consumables from other leading brands, offering flexibility for shop inventory management.

Reliable Trigger System

The trigger assembly is often the first point of failure in welding guns, but Lincoln has addressed this with a one-piece modular trigger molded from high-heat resistant thermoset material. This construction withstands spatter and high temperatures, ensuring reliable arc initiation every time. The rugged strain relief system further enhances reliability by reducing acute cable angles, promoting smooth wire feeding and protecting the liner.