18C36 - Weldcraft 18SC Series Heavy Duty Collet 3/16 Inch - 2 Pack

Product Overview

The Miller Weldcraft 18C36 is a specialized Heavy Duty Collet designed to meet the rigorous demands of high-amperage TIG welding. Engineered specifically for use with the Weldcraft 18SC (Super Cool) series of water-cooled torches, this component plays a critical role in the electrical and thermal efficiency of the welding assembly. With a bore diameter of 3/16 inch (4.8mm), it is precision-manufactured to securely hold tungsten electrodes of the corresponding size, ensuring a stable arc and consistent performance during critical fabrication tasks.

Technical Construction and Performance

Manufactured from a high-grade copper alloy, the 18C36 collet is built to withstand the intense heat cycles associated with heavy industrial welding. Unlike standard collets, the heavy-duty designation of this part indicates enhanced wall thickness and material composition optimized for current transfer. In the TIG welding process, the collet acts as the primary contact point for transferring welding current from the torch body to the tungsten electrode. The superior conductivity of this heavy-duty variant minimizes electrical resistance, thereby reducing heat buildup within the collet itself and preventing premature failure or deformation.

Compatibility and Application

It is important to note that the 18C36 is distinct from standard 18-series consumables. It is specifically tailored for the 18SC torch, which is a high-capacity, water-cooled unit often used in automated or heavy manual welding operations requiring amperages up to 400A. The collet works in conjunction with the collet body to exert clamping force on the tungsten, maintaining precise alignment within the gas cup. This is particularly vital when welding thicker materials where electrode stability directly impacts weld bead geometry and penetration profile.

Maintenance and Replacement

Supplied in a package of two, these collets allow operators to maintain a ready supply of spares. Over time, thermal cycling can cause collets to twist or lose their spring tension, leading to poor arc starts or unstable arcs. Regular inspection of the collet condition is recommended. If the collet shows signs of discoloration, arc burns, or mechanical distortion, it should be replaced immediately to preserve the integrity of the torch head and the quality of the weld. The 18C36 ensures that users of the 18SC system can maintain the high standards of performance expected from Miller Weldcraft equipment.