326P274735 - ESAB Yellow PTFE Liner for Aluminum and Stainless Steel Wire

Technical Overview of the ESAB PTFE Liner

The ESAB 326P274735 is a specialized MIG gun liner constructed from Polytetrafluoroethylene (PTFE), commonly referred to as Teflon. This material is selected for its exceptionally low coefficient of friction, which is critical when feeding soft welding wires such as aluminum or certain grades of stainless steel. Unlike coiled steel liners, which can abrade soft wires and cause shaving accumulation or increased drag, the smooth interior surface of this PTFE liner ensures that the wire glides effortlessly from the feeder to the contact tip.

In industrial welding applications involving aluminum, the column strength of the wire is significantly lower than that of mild steel. This makes the wire prone to buckling (bird-nesting) if it encounters resistance within the torch cable. The ESAB Yellow PTFE liner mitigates this risk by minimizing drag forces. The yellow external coding typically denotes a specific diameter range compatibility, allowing technicians to quickly verify that the liner matches the wire size being used. Proper installation involves ensuring the liner is cut to the correct length and seated firmly to prevent gas loss or wire misalignment.

This component is an integral part of the wire feeding system for ESAB MIG guns. Regular inspection and replacement of the liner are recommended, as even PTFE can wear over time or become clogged with shop debris, which would reintroduce friction and compromise weld quality. This liner is specifically engineered to withstand the mechanical stresses of flexing cables while maintaining a consistent internal diameter for precision wire delivery.