41V35 - ESAB 41V35 Medium TIG Torch Back Cap for 9 & 20 Series (2-Pack)

Technical Overview of the ESAB 41V35 Medium Back Cap

The ESAB 41V35 Medium Back Cap is a critical consumable component designed for use with 9 Series (air-cooled) and 20 Series (water-cooled) TIG welding torches. As an industry-standard part, it ensures broad compatibility across various torch models including the WP-9, WP-20, HW-20, and HW-20A. This component serves the vital function of applying axial pressure to the collet, which in turn secures the tungsten electrode within the collet body. The integrity of this connection is essential for maintaining consistent electrical conductivity and arc stability during the Gas Tungsten Arc Welding (GTAW) process.

Constructed from high-grade, heat-resistant phenolic or polymer materials, the cap is engineered to withstand the radiant heat generated during welding operations without deforming or cracking. The threaded brass insert ensures a precise fit into the torch head, preventing cross-threading and ensuring a secure mechanical connection. Additionally, the back cap features a fitted O-ring that creates a gas-tight seal, preventing atmospheric contamination of the shielding gas stream. This is particularly important in TIG welding, where shielding gas purity is paramount to preventing weld defects such as porosity or oxidation.

The "Medium" designation refers to the physical length of the cap. Unlike short back caps (buttons) that require tungsten to be cut down significantly, or long back caps that extend the torch profile, the medium cap accommodates a reasonable length of tungsten electrode while keeping the overall torch footprint compact. This balance makes it an excellent choice for general fabrication where access to the workpiece may be slightly restricted, but standard electrode lengths are preferred for economy and convenience. This product is supplied as a pack of two, providing necessary redundancy for industrial environments.