54C311 - Bernard Style Centerfire Nozzle N-3418-C - 3/4" Bore, 1/4" Recess

Technical Overview of the N-3418-C Style Nozzle

The Walter N-3418-C style nozzle is a precision-engineered consumable designed for compatibility with Bernard Centerfire™ series MIG guns. This component plays a critical role in the gas metal arc welding (GMAW) process by directing the shielding gas flow around the weld pool and protecting the contact tip from mechanical damage and electrical shorts. The nozzle is manufactured from high-grade copper, selected for its superior thermal conductivity and durability in high-heat environments.

This specific model features a 3/4-inch (19mm) bore diameter, classifying it as a large-bore nozzle suitable for high-amperage applications where a broader gas envelope is required to prevent porosity. The 1/4-inch recess places the contact tip slightly inside the nozzle body. This recessed geometry is advantageous for spray transfer modes and higher current welding, as it reduces the accumulation of spatter on the contact tip and minimizes the risk of the tip shorting against the workpiece during tight joint access.

The nozzle utilizes the Centerfire system's signature threadless, drop-in design. Instead of screwing onto the diffuser, it is held in place by a spatter shield (diffuser) and a tapered seat, allowing for rapid removal and replacement without tools. This design also ensures concentricity between the contact tip and the nozzle, maintaining a consistent gas flow pattern. The smooth copper surface finish aids in resisting spatter adhesion, prolonging the service life of the consumable during extended welding cycles.