13N28 - Esab 13N28 3/32" TIG Collet Body for 9/20 Series Torches

Technical Overview: 13N28 Collet Body

The 13N28 Collet Body is the standard interface for 3/32" (2.4mm) tungsten electrodes in small-body TIG torches. If you are running a WP-9, WP-20, or WP-25 torch, this is the component that screws into the torch head and houses the collet. Its primary function is two-fold: it compresses the collet against the tungsten when the back cap is tightened, and it transfers the welding current from the torch body to the electrode. Because it sits directly in the path of the welding current and shielding gas, the quality of the collet body directly impacts arc stability and gas coverage.

Optimized Current Transfer
Made from a conductive copper alloy, this Esab collet body is designed to handle amperage ranges typically associated with 9 and 20 series torches (up to 250A on water-cooled models). Poor quality collet bodies often suffer from thread galling or poor machining, which can lead to resistance heating inside the torch head. This unit ensures a clean, low-resistance connection, keeping your torch cooler and preventing the 'spongy' feeling when tightening the back cap.

Gas Flow and Turbulence
The 13N28 features standard gas ports that distribute shielding gas into the ceramic cup. While not a gas lens, the precision machining of the ports ensures that gas flow is relatively laminar for a standard collet body setup. This is crucial for preventing atmospheric contamination of the weld pool. For critical applications requiring extended stick-out, a gas lens system might be preferred, but for general fabrication and standard cup sizes, this collet body provides robust and reliable performance.

Installation and Maintenance
To install, simply thread the 13N28 into the torch head until finger tight. Insert your 3/32" collet, then the tungsten, and finally the back cap. Inspect the threads and the seating surface regularly. If you notice discoloration or deformation on the collet body, it is time to replace it to avoid damaging the torch head threads. This part is compatible with standard alumina nozzles (13N series cups) and is a staple in any TIG welder's kit.