14001133 - Tweco 40-15 MIG Gun Liner for .030-.035 Wire, 15 ft

Technical Overview of the Tweco 40-15 Conduit Liner

The Tweco 1400-1133 (Model 40-15) is a standard-duty steel conduit liner designed specifically for the precise feeding of solid steel welding wires. Engineered to accommodate wire diameters of 0.030 inches (0.8mm) to 0.035 inches (0.9mm), this liner is a critical component for maintaining arc stability and deposition consistency in semi-automatic welding processes. The liner features a 15-foot (4.6-meter) length, making it compatible with standard length MIG gun cable assemblies commonly found in industrial fabrication environments.

Constructed from high-tensile spring steel, the 40-15 liner is wound to a specific pitch that balances flexibility with columnar strength. This design prevents the liner from collapsing under the compression of the cable while allowing the gun to maneuver around complex workpieces. The steel wire is zinc-plated, a crucial treatment that minimizes friction between the welding wire and the liner wall, while simultaneously providing a barrier against oxidation and corrosion that can occur in humid shop environments. This reduction in friction coefficient is essential for preventing "chatter" and ensuring a smooth wire velocity at the contact tip.

This component is part of the extensive Tweco 40-Series consumable line and is directly compatible with Tweco Classic No. 2, 3, 4, and 5 MIG guns, as well as the Spray Master series. Proper maintenance of the conduit system is vital; a worn or clogged liner is a leading cause of wire feeding failures. The 1400-1133 offers a reliable, OEM-specification replacement that restores the mechanical integrity of the wire feed path.