45V42 - Weldcraft 45V42 Gas Lens for 9/20 Series Torches (.040") - 2 Pack

Precision Gas Flow Dynamics for TIG Applications

The Weldcraft 45V42 Gas Lens is a critical component for precision Gas Tungsten Arc Welding (GTAW), specifically engineered to optimize shielding gas distribution for .040" (1.0mm) electrode applications. Unlike standard collet bodies which can produce turbulent gas flow, this gas lens utilizes a multi-layered fine mesh screen assembly. This internal structure acts as a flow straightener, effectively converting turbulent gas velocity into a coherent, laminar stream. This reduction in turbulence is paramount for maintaining a pristine weld pool, particularly when working with reactive metals or high-specification alloys where atmospheric contamination must be strictly minimized.

By establishing a stable column of shielding gas, the 45V42 allows the operator to extend the tungsten electrode significantly further beyond the nozzle cup—often up to an inch depending on the cup size and gas flow rate—without compromising the inert atmosphere around the molten pool. This extended stick-out capability is technically advantageous for complex geometries, allowing the arc to reach into deep fillets, corners, and narrow grooves that would otherwise be inaccessible with a standard setup. The laminar flow also provides a stiffer column of gas, which is less susceptible to cross-drafts, thereby enhancing process reliability in varied shop environments.

Manufactured to strict tolerances, the 45V42 is compatible with a broad range of TIG torch bodies, including the air-cooled 9 series (WP-9) and water-cooled 20 and 25 series (WP-20, WP-25). It also fits specialized 22 and 24 series torches. This versatility makes it a staple inventory item for fabrication shops utilizing low-amperage, precision torches. The component is constructed from high-quality brass and copper alloys to ensure efficient current transfer and thermal conductivity, mitigating overheating issues during prolonged welding cycles. This package contains two (2) genuine Weldcraft gas lenses, ensuring a backup is available for critical production runs.