The Weldcraft 41V35 Medium Back Cap is a precision-engineered component designed specifically for the 9 Series (air-cooled) and 20/25 Series (water-cooled) TIG welding torches. As a critical element of the TIG torch assembly, the back cap performs two primary functions: it applies axial pressure to the collet, forcing it against the collet body to securely grip the tungsten electrode, and it creates a hermetic seal at the rear of the torch head to prevent atmospheric contamination of the shielding gas stream. This specific model, the 41V35, is the "medium" variant, bridging the gap between the standard long back cap (41V24) and the short button cap (41V33).
Manufactured from high-grade phenolic resin, the 41V35 is designed to withstand the significant thermal cycling and radiant heat generated during welding operations, particularly in water-cooled applications rated up to 250 amps. The material is chosen for its dielectric strength, ensuring electrical isolation, and its resistance to impact and cracking. The threaded insert is machined to tight tolerances to ensure smooth engagement with the torch body, preventing cross-threading and ensuring a consistent seal. Each cap comes pre-installed with a high-quality O-ring, which is essential for maintaining the integrity of the inert gas shield; a compromised O-ring can lead to porosity in the weld zone due to air aspiration.
The medium form factor of the 41V35 is particularly advantageous in industrial MRO and fabrication environments where variable joint geometries are encountered. It accommodates a tungsten electrode length that is shorter than a full 7-inch rod but significantly longer than the stubs required for button caps. This allows for extended tungsten life and reduced waste while still reducing the overall profile of the torch for better access in confined spaces. This product is supplied as a package of two, adhering to standard inventory practices for high-wear consumables.
Compatibility extends across the board for torches utilizing the 9/20 form factor, including models from Weldcraft, Miller, Lincoln, CK Worldwide, and Radnor (HW-20, HW-20A, WP-20). It is an essential stock item for any welding operation utilizing small-body TIG torches for precision work on stainless steel, aluminum, or exotic alloys.
| Additional Information |
|---|
| Brand:Weldcraft |
| Item:Back Cap Medium |
| Packaging Description:2-per-ea |
| Compatible Torch Series:WP-9, WP-20, WP-25, HW-20, HW-20A |
| Material:High-Temperature Phenolic |
| Accessory Type:TIG Torch Back Cap |
| Cooling Method Compatibility:Air Cooled, Water Cooled |
