14501003 - Tweco 45N-3545-15 Nylon MIG Gun Liner for Aluminum Wire

Tweco 45N-3545-15 Nylon Conduit Liner Overview

The Tweco 45N-3545-15 (SKU: 1450-1003) is a specialized conduit liner designed specifically for the transport of soft welding wires, such as aluminum, through MIG welding gun cable assemblies. Unlike standard steel wound liners, this conduit is manufactured from high-quality nylon. This material selection is critical for aluminum welding applications, as it significantly reduces the coefficient of friction between the liner wall and the wire. This reduction in friction prevents the soft aluminum wire from shaving, binding, or buckling—common issues known as "bird-nesting"—thereby ensuring a consistent and stable arc.

This specific liner measures 15 feet (4.5 meters) in length, making it suitable for standard length MIG guns. It is engineered to accommodate wire diameters ranging from 0.030 inches (0.8 mm) up to 3/64 inches (1.2 mm). The liner acts as the central guide within the cable assembly, protecting the wire and gas hose while maintaining the structural integrity of the feed path. Proper installation of a nylon liner often requires specific attention to the collet or termination points to ensure the liner extends fully to the drive rolls and contact tip, minimizing unsupported wire length.

Industrial professionals rely on genuine Tweco consumables to maintain the performance standards of their welding equipment. The 45N-3545-15 is a direct replacement part for compatible Tweco MIG guns and is an essential component for any fabrication shop transitioning between steel and aluminum projects. Regular inspection and replacement of the conduit are recommended to prevent contamination and wear that can lead to feedability issues.