54N18 - Weldcraft 54N18 #4 Alumina Gas Lens Cup (10-Pack)

Technical Overview of the Weldcraft 54N18 Alumina Gas Lens Nozzle

The Weldcraft 54N18 is a high-performance Alumina Gas Lens Nozzle designed for precision TIG welding applications. Engineered by Miller Weldcraft, this consumable is manufactured from high-grade alumina ceramic (aluminum oxide), a material chosen for its exceptional dielectric strength, thermal conductivity, and resistance to thermal shock. This specific nozzle is sized as a #4, providing a 1/4-inch (6.4mm) orifice diameter, making it ideal for applications requiring tight access or focused shielding gas coverage on thinner materials.

Unlike standard TIG nozzles, the 54N18 is specifically threaded to mate with gas lens collet bodies (such as the 45V series). The internal geometry is optimized to accommodate the gas lens screen assembly, which rectifies the flow of shielding gas (Argon or Helium) into a coherent, laminar stream. This laminar flow significantly reduces atmospheric contamination and allows for a greater tungsten electrode stick-out (extension) without compromising the inert atmosphere around the weld pool. This capability is critical in aerospace, motorsports, and sanitary piping industries where weld integrity and accessibility to confined joints are paramount.

The 54N18 is compatible with the industry-standard "3-Series" torch front-end parts, meaning it fits all air-cooled 17 and 26 series torches, as well as water-cooled 18 series torches. It requires the use of a 54N01 insulator (or equivalent) when installed on standard torch bodies to ensure proper seating and electrical isolation. The alumina composition offers a robust balance between cost and performance, resisting splatter adhesion and withstanding the high radiant heat generated during the GTAW process. Supplied in a pack of 10, these nozzles ensure that operators have a consistent supply of reliable consumables for production environments.

Key Technical Specifications:

• Material Composition: High-purity Alumina Ceramic.
• Orifice Size: #4 (1/4" / 6.4mm).
• Thread Standard: Compatible with 45V series gas lenses.
• Thermal Properties: High resistance to thermal cycling and shock.
• Compatibility: WP-17, WP-18, WP-26, and CS300 series torches.