The Weldcraft Compatible TIG Back Cap - Long (41V24) eliminates the need for frequent electrode cutting, allowing fabricators to utilise full 175mm tungsten lengths in open-access joints. This heavy-duty component maintains a consistent atmospheric seal to prevent weld porosity caused by shielding gas leakage.

What’s In the Box

• 1 x Long Back Cap (41V24)

• 1 x Pre-fitted High-Temperature Rubber O-Ring

Benefit-Driven Technicals

• 145mm Internal Clearance: Accommodates full-length 175mm electrodes to reduce material waste and downtime spent grinding short tungstens.

• Precision Threading: Ensures a gas-tight seal against the torch head, preventing oxygen contamination in the weld pool during high-amperage cycles.

• Impact-Resistant Phenolic Body: Withstands high radiant heat and accidental drops on workshop floors without cracking or threading deformation.

• Integrated Rubber O-Ring: Provides a mechanical barrier against gas escape, ensuring laminar flow remains consistent at the ceramic nozzle.

Features

• Genuine 41V24 geometry.

• Compatible with WP9, WP9V, WP20, WP20V, and WP25 torches.

• High-dielectric strength construction.

• Ribbed grip for easy tightening with welding gloves.

Applications

• General sheet metal fabrication.

• Stainless steel pipework where internal access is not restricted.

• High-duty cycle production welding.

• Aerospace and automotive TIG applications.

EWS Expert Note

While the long back cap is essential for maximising tungsten life, ensure you do not over-tighten it against the torch body. Excessive torque can flatten the O-ring over time, leading to subtle gas leaks that are difficult to diagnose but result in "blackened" welds on stainless steel. Hand-tight is sufficient for a 100% gas seal.

Pros & Cons

• Pros: Maximises consumable economy by accepting full tungstens; excellent heat dissipation for high-duty cycles; universal fitment for all standard WP9/20 torch bodies.

• Cons: Unsuitable for welding in confined spaces or tight pipe headers; adds length to the torch profile which may affect balance for delicate, low-amperage work.

Technical FAQs

Will this back cap fit my specific air-cooled or water-cooled TIG torch?

The 41V24 is designed specifically for the WP9 (air-cooled) and WP20 (water-cooled) series, which share the same small-format front-end consumables. It is also compatible with WP25 and WP9V variants. However, it will not fit the larger WP17, 18, or 26 torch bodies, which require the 57Y series caps.

Are there any performance limits when welding at high amperages for extended periods?

Constructed from industrial-grade phenolic resin, this back cap is rated for the full duty cycle of standard WP20 water-cooled torches. While it handles high radiant heat, ensure the O-ring is inspected regularly. If the O-ring perishes due to extreme heat, gas coverage will be compromised, leading to weld oxidation.

What maintenance is required to ensure UKCA compliance and site safety?

Maintenance is minimal but critical for safety. Regularly inspect the internal threads for stripping and the O-ring for cracks or flattening. Using damaged back caps can lead to high-frequency (HF) leakage, which may interfere with surrounding electronic equipment. Ensure the cap is clean of anti-spatter or grease to maintain dielectric integrity.

As an Official UK Stockist, Express Weldcare provides genuine Weldcraft compatible equipment with expert technical backup and fast despatch.