KP2017-4B1 - Lincoln Electric #7 Alumina Cup for PTA-9/PTW-20 Torches

Precision Gas Coverage with Lincoln Electric Alumina Nozzles

The Lincoln Electric KP2017-4B1 Alumina Nozzle No. 7 is a critical component for achieving high-quality TIG welds. Designed specifically for the professional welder, this nozzle fits the popular PTA-9 and PTW-20 series torches, as well as other industry-standard 9 and 20 series TIG torches. The nozzle features a #7 orifice, which corresponds to a 7/16-inch (approximately 11 mm) inside diameter. This size is widely regarded as a versatile standard for a broad range of welding applications, offering an optimal balance between gas coverage and accessibility to the weld joint.

Manufactured from high-grade Alumina ceramic, this nozzle is engineered to withstand the extreme thermal cycles inherent in Gas Tungsten Arc Welding (GTAW). Alumina (aluminum oxide) is chosen for its superior electrical insulating properties and high resistance to thermal shock. Unlike lower-grade materials that may crack under rapid heating and cooling, the KP2017-4B1 maintains its structural integrity, ensuring a long service life even in demanding industrial environments. The ceramic material also resists spatter adhesion, making it easier to keep clean and maintaining a smooth gas flow path.

Proper shielding gas coverage is essential for preventing porosity and atmospheric contamination in the weld pool. The geometry of the Lincoln KP2017-4B1 is precision-molded to direct the flow of Argon or Helium smoothly over the tungsten electrode and the workpiece. This laminar flow protection is crucial when welding reactive metals like aluminum or stainless steel, where even slight turbulence or drafts can compromise the weld integrity. By using genuine Lincoln Electric consumables, operators ensure that their equipment performs to factory specifications, minimizing downtime and rework.

This nozzle attaches securely to standard collet bodies, providing a tight seal that prevents gas leakage at the torch head. Whether you are performing intricate aerospace work, automotive fabrication, or general maintenance, the reliability of your torch consumables plays a direct role in the quality of your output. The KP2017-4B1 represents Lincoln Electric's commitment to providing top-tier accessories that support the skilled tradesperson in achieving flawless results.