112707 - Miller 112707 Teflon Liner for Aluminum Wire .047-1/16

Technical Specifications and Application

The Miller 112707 is a genuine OEM replacement Teflon liner designed for use with Miller's line of push-pull MIG guns, specifically the XP15 and XR-30 models. This component is critical for the successful transmission of aluminum welding wire, accommodating sizes from .047" (1.2mm) up to 1/16" (1.6mm). The liner is manufactured from high-durability Teflon, which is chemically inert and provides a smooth, non-abrasive surface that prevents the soft aluminum wire from binding or galling against the liner walls during operation.

In push-pull systems, synchronization between the feeder motor and the gun motor is vital. Any drag introduced by the liner can disrupt this balance, causing wire deformation or burn-back at the contact tip. The 112707 liner minimizes this drag, ensuring that the torque applied by the motors translates directly into consistent wire feed speed. This is particularly important when welding with 4000 or 5000 series aluminum alloys, which have different stiffness characteristics. The liner's internal diameter is precisely calibrated to support the specified wire range without allowing excessive play that could lead to micro-arcing inside the cable.

Installation and Maintenance:
Proper installation of the 112707 liner is essential for optimal performance. The liner is supplied at a length of 4.125 (meters), which is approximately 13.5 feet. This length is designed to be trimmed to the exact requirement of your specific gun cable assembly. When installing, it is crucial to ensure the liner is cut cleanly and deburred to prevent snagging the wire. It is also recommended to use a liner gauge or follow the specific service manual instructions for the XP15/XR-30 to determine the correct stick-out length at the front end. Regular inspection of the liner for kinks, debris buildup, or wear is recommended as part of a preventative maintenance schedule.

By utilizing genuine Miller consumables, operators ensure compatibility and longevity of their equipment. This liner is packaged individually and is ready for immediate installation. It serves as a direct replacement for worn or contaminated liners, helping to maintain the high duty cycle and performance standards expected from Miller industrial welding systems.