85Z17 - WP-12 Series 5/32 Inch TIG Collet

Technical Overview of the 85Z17 WP-12 Collet

The 85Z17 Collet is a critical consumable component designed exclusively for the WP-12 series of TIG welding torches. This specific collet is engineered to accommodate tungsten electrodes with a diameter of 5/32 inch (approximately 4.0mm), a size typically reserved for heavy-duty industrial applications requiring high amperage. The WP-12 torch platform is a water-cooled system rated for up to 500 amps, and the 85Z17 collet is manufactured to withstand the intense thermal and electrical stresses associated with this power level.

Manufactured from high-grade tellurium copper or similar conductive alloys, this collet ensures minimal electrical resistance at the contact point between the power cable assembly and the tungsten electrode. Proper current transfer is essential in high-amperage TIG welding to prevent overheating of the torch head and to maintain a stable, focused arc. The split-design of the collet allows it to compress against the tungsten when the back cap is tightened, securing the electrode in place and ensuring consistent stick-out length during operation.

Compatibility is strictly limited to the WP-12 series torch bodies. Unlike the more common 17/18/26 series or the 9/20 series, the WP-12 utilizes a unique consumable ecosystem due to its heavy-duty construction. Operators must ensure they are using the corresponding WP-12 collet body and nozzle to ensure proper gas flow and mechanical fitment. Regular inspection of the 85Z17 collet is recommended; signs of wear such as elongation, twisting, or arc burns on the contact surfaces indicate the need for immediate replacement to preserve torch integrity and weld quality.

In industrial settings, such as pipe welding, aerospace, and heavy fabrication, the reliability of the collet directly impacts downtime. The 85Z17 provides the robust performance required for continuous welding on thick aluminum and steel sections, ensuring that the full 500-amp capacity of the WP-12 torch can be utilized effectively.