18GL18 - Weldcraft 18GL18 1/8" Gas Lens for 18SC Torches

Technical Overview of the Weldcraft 18GL18 Gas Lens Collet Body

The Weldcraft 18GL18 is a specialized gas lens collet body engineered specifically for the heavy-duty 18SC (Super Cool) and W-400 water-cooled TIG torches. Designed to accommodate 1/8-inch (3.2mm) tungsten electrodes, this component plays a critical role in the management of shielding gas flow during high-amperage welding operations. Unlike standard collet bodies which can produce turbulent gas exit profiles, the 18GL18 incorporates a multi-layer mesh screen that rectifies the flow of inert gas (typically Argon or Helium) into a coherent, laminar stream. This reduction in the Reynolds number of the gas column minimizes the entrainment of atmospheric contaminants, thereby ensuring superior oxidation protection for the weld pool.

The structural integrity of the 18GL18 is maintained through the use of high-grade copper alloy, which provides the necessary thermal and electrical conductivity required for the high-duty cycles associated with the 18SC torch series. The 18SC torch is often utilized in demanding industrial environments where heat dissipation is paramount; consequently, the collet body must efficiently transfer current to the tungsten while withstanding significant thermal loads. The precision machining of the collet seat ensures optimal contact with the collet, preventing arcing within the torch head and ensuring stable arc initiation.

One of the defining technical benefits of this gas lens system is the capability for extended electrode stick-out. By stabilizing the gas column, the operator can extend the tungsten electrode significantly further beyond the nozzle orifice—often up to an inch or more depending on conditions—without the gas stream breaking up. This feature is indispensable for welding in deep grooves, fillets, or restricted access areas where a standard nozzle configuration would obstruct the torch manipulation. This product is supplied in a package of two, ensuring that industrial operators have immediate replacement stock available to maintain production continuity.

Compatibility is strictly limited to the 18SC and W-400 chassis due to the unique thread pitch and physical dimensions of these high-capacity torches. It is not interchangeable with standard 17, 18, or 26 series torch components, which utilize the 45V series gas lenses. Proper installation requires the mating 18GL series insulator and appropriate gas lens nozzles to complete the assembly.