34015 - ESAB Medium Back Cap for 17/18/26 Series TIG Torches (2-Pack)

Reliable TIG Torch Maintenance with ESAB

The ESAB 34015 Medium Back Cap is an essential consumable designed for the professional welder utilizing the industry-standard HW-17, HW-18, and HW-26 series TIG torches. As part of the renowned Heliarc line, this component is engineered to meet the rigorous demands of industrial welding environments. The back cap plays a critical role in the TIG torch assembly, performing two primary functions: it applies the necessary downward pressure on the collet to securely lock the tungsten electrode in place, and it creates an airtight seal at the rear of the torch head to prevent shielding gas leakage. A compromised back cap can lead to atmospheric contamination of the weld pool, porosity, and unstable arc characteristics.

This specific model is the "Medium" size variant. In the hierarchy of back caps—ranging from short (button) caps for tight access to long caps for maximum tungsten length—the medium cap offers an excellent compromise. It allows for the use of reasonably long tungsten electrodes, reducing the frequency of electrode changes and grinding, while still maintaining a profile that is compact enough for most general fabrication tasks. This balance makes it a favorite among shop fabricators who need versatility without constantly swapping torch configurations.

Constructed from high-impact, heat-resistant polymers, the ESAB 34015 is built to withstand the thermal cycles and mechanical stress typical of daily welding operations. The threads are precision-molded to ensure smooth engagement with the torch body, preventing cross-threading issues that can damage expensive torch heads. Furthermore, each cap comes pre-fitted with a high-quality O-ring. This O-ring is crucial for maintaining the integrity of the shielding gas envelope; even a microscopic leak at the back cap can draw in air via the Venturi effect, compromising weld quality. By choosing genuine ESAB parts, you ensure that your equipment operates at peak efficiency with consumables manufactured to exact OEM specifications.

This product is supplied in a pack of 2, ensuring that you always have a spare on hand during critical production runs. Whether you are welding stainless steel in a pharmaceutical plant or aluminum in an aerospace facility, the reliability of your torch consumables is paramount. Trust ESAB's legacy of welding excellence to keep your arc stable and your welds clean.