About TIG/GTAW Nozzles
Alumina (pink), Lava (brown), Pyrex and Quartz (glass) TIG Torch Nozzles
TIG/GTAW gas nozzles (also called TIG cups) are available in a wide variety of materials, shapes and sizes depending on your TIG torch and welding application.
The gas outlet or orifice of a TIG nozzle is measured in 1/16” (1.6mm) increments. For example a No. 4 nozzle is 1/4”, or 4/16” in diameter. The gas nozzle orifice is located at the end of the nozzle farthest from the torch body. With the exception of a specialty torch, such as one for micro TIG welding, the smallest nozzle is the No. 3, 3/16” and the largest is a No. 16, or 1” nozzle.
The most common TIG cups are made of Alumina Oxide and are “pink” in color. Alumina is a high- temperature, nonconductive pink ceramic material. This material is injection-molded and mass-produced, which is why the alumina nozzles are less expensive than those made with other materials. Alumina nozzles are durable and good for general TIG welding applications. Extreme heat generated from high amperage applications can cause a wide temperature difference from the front of the nozzle (tungsten electrode) to the back (torch body) resulting in thermal shock, which can cause the nozzle to crack, or in extreme cases blow the orifice end off.
Lava nozzles are tan/gray colored, Lava is a high-temperature, nonconductive clay material that is machined on a lathe to make special sizes. This process lends itself to odd-shaped TIG cup like the long (L), extra-long (XL), and extra-extra-long (XXL) nozzles. Lava TIG nozzles work well in specialty TIG welding applications with high heat but don't work as well in confined areas with excessive reflective heat, which can cause the nozzle to expand and contract, and ultimately break.
Glass nozzles consist of two types: Pyrex a low-temperature, nonconductive glass material, and Quartz a high-temperature, nonconductive glass material. These glass materials are hand-blown to make nozzles for specialty TIG torches for micro welding, and for large purging nozzles. Because glass nozzles can’t be threaded, you need to convert your "standard" TIG torch with modified collets, collet bodies or gas lens collet bodies to accept a “push-on” glass nozzle.
Arc-Zone.com carries the industry's most complete line of TIG/GTAW gas nozzles, engineered purging and flooding cups, trail shields and other specialty TIG nozzles for the most demanding titanium, stainless steel and high-purity TIG welding applications.