0365310049 - ESAB 41V33 Short Back Cap for WP-9 & WP-20 TIG Torches

Technical Overview of the ESAB 41V33 Short Back Cap

The ESAB 41V33 Back Cap Short is a specialized consumable component engineered for Gas Tungsten Arc Welding (GTAW) applications requiring maximum torch maneuverability. Designed to fit the industry-standard "Series 2" or "Small Series" TIG torch bodies—specifically the air-cooled WP-9 and water-cooled WP-20 and WP-25 models—this back cap serves a critical function in the torch assembly. It threads into the rear of the torch head, applying pressure to the collet to secure the tungsten electrode in place while simultaneously creating a hermetic seal to prevent shielding gas leakage.

The primary distinction of the 41V33 model is its low-profile geometry. Unlike medium or long back caps which accommodate full-length tungsten electrodes, this short back cap is designed for use with shortened tungsten segments. This configuration significantly reduces the overall length of the torch head assembly, often by several inches, thereby permitting the operator to manipulate the torch within restricted envelopes, such as narrow pipe gaps, engine bays, or complex structural nodes. The component is manufactured from high-grade, heat-resistant phenolic compounds capable of withstanding the radiant heat generated during welding operations without deforming or cracking. It features precision-machined brass threads for smooth engagement and includes a pre-installed O-ring to ensure a leak-free connection with the torch body.

Reliability in TIG welding depends heavily on the integrity of the gas shield; the ESAB 41V33 ensures that atmospheric contamination is excluded from the back of the torch. It is an essential inventory item for fabrication shops dealing with precision stainless steel, aluminum, or exotic alloy welding where access is often limited.