18850 - ESAB PT-31 Plasma Cutting Nozzle (18850)

Precision Plasma Cutting Consumable

The ESAB 18850 Nozzle is a critical component designed for the widely used PT-31 and PT-31XL plasma cutting torches. In the plasma cutting process, the nozzle plays a pivotal role by constricting the ionized gas flow (plasma) into a focused, high-velocity stream. This constriction increases the energy density of the arc, allowing it to melt through conductive metals such as steel, stainless steel, and aluminum with precision and speed. Manufactured from high-grade copper alloy, this nozzle is engineered to withstand the intense thermal loads generated during the cutting process while maintaining excellent electrical conductivity.

Over time, the orifice of a plasma nozzle will naturally erode due to the extreme heat and velocity of the plasma arc. As the orifice widens or becomes out-of-round, the arc loses its focus, resulting in a wider kerf, increased dross (slag) accumulation, and a reduction in cutting speed. The ESAB 18850 is manufactured to tight tolerances to ensure the orifice geometry is perfect out of the box, restoring the torch's ability to produce clean, square cuts. It is rated for use in amperage ranges typically between 30A and 50A, making it suitable for a variety of light-to-medium duty fabrication tasks.

Proper maintenance of plasma consumables is essential for equipment longevity. The nozzle is electrically isolated from the electrode by a swirl ring or gas distributor, and maintaining this isolation is key to preventing internal arcing. Users should regularly inspect the 18850 nozzle for signs of wear, such as an oval-shaped orifice or molten metal spatter on the face. Replacing the nozzle in a timely manner protects the torch head from damage and ensures consistent cut quality. This specific part number is a direct OEM-style replacement, ensuring perfect fitment and gas seal integrity for PT-31 series torches.

Whether used in automotive repair, HVAC ductwork fabrication, or general metal art, the reliability of the torch consumables directly impacts the project outcome. The ESAB 18850 provides the consistency professional fabricators require, minimizing downtime associated with poor arc starts or wandering arcs caused by worn consumables.