38V86 - ESAB 38V86 Replacement Liner for ST-21 MIG Guns (.035-1/16 in, 15 ft)

Technical Overview of the ESAB 38V86 Conduit Assembly

The ESAB 38V86 Conduit Assembly is a critical replacement component designed for the maintenance and optimization of ESAB MIG welding guns, specifically the ST-21, ST-16, and ST-23 series. This conduit, often referred to as a liner, serves as the internal guide for the welding wire as it travels from the wire feeder through the gun cable to the contact tip. Maintaining the integrity of this component is essential for achieving consistent wire feed speeds and preventing mechanical failures such as bird-nesting or erratic arc characteristics.

Engineered to accommodate a versatile range of wire diameters, the 38V86 is compatible with wires ranging from 0.035 inches (0.9 mm) up to 1/16 inches (1.6 mm). This flexibility makes it an ideal choice for fabrication shops that switch between light-gauge sheet metal work and heavier structural welding without needing to constantly change gun liners. The assembly measures 15 feet in length, matching the standard cable length of many ESAB industrial guns, though it can be trimmed for shorter assemblies if required.

Constructed from high-grade steel monocoil, the liner provides a low-friction path for the electrode. This reduces the load on the wire feeder motor and drive rolls, extending the lifespan of the entire feeding system. The liner is designed to resist kinking and crushing, common issues in rugged industrial environments. Regular inspection and replacement of the conduit are recommended as part of a preventative maintenance schedule to ensure high-quality weld deposits and operator efficiency.

Installation of the 38V86 is straightforward, adhering to standard ESAB maintenance procedures. It is crucial to ensure the liner is cut to the correct length and seated properly at the gas diffuser to prevent gas leakage or wire shaving accumulation. As an OEM part, it guarantees dimensional accuracy and material compatibility with ESAB's proprietary gun designs.