WP332X7 - Weldcraft Pure Tungsten Green Tip 3/32 Inch Electrodes (10-Pack)

Technical Overview of Weldcraft Pure Tungsten Electrodes

The Miller Weldcraft WP332X7 is a package of ten Pure Tungsten electrodes, identified by the industry-standard Green color code. These electrodes are manufactured to strict tolerances, composed of a minimum of 99.5% tungsten with no significant alloying elements. This specific chemical composition classifies them under the AWS (American Welding Society) specification as EWP. Pure tungsten is historically significant and technically specific; it possesses the highest work function of all tungsten types, which necessitates a higher temperature to emit electrons. While this might be a disadvantage in DC welding, it is a critical advantage in AC (Alternating Current) applications.

When used with AC current, particularly on transformer-based constant current power sources, the WP332X7 forms a clean, balled end when heated. This balling characteristic is essential for AC welding as it spreads the arc over a larger surface area, effectively dissipating the intense heat generated during the electrode-positive half-cycle of the AC wave. This thermal management prevents the tungsten from splitting or spitting into the weld pool, provided the amperage is kept within the appropriate range for the 3/32-inch diameter. The 3/32-inch (2.4mm) size is a versatile mid-range diameter, suitable for welding aluminum and magnesium sheets and castings of moderate thickness.

It is important to note that Pure Tungsten is strictly recommended for AC welding of Aluminum and Magnesium alloys. It is generally not suitable for DC welding (Direct Current) because it does not hold a sharp point well and arc initiation can be difficult compared to thoriated or lanthanated counterparts. However, for sine wave and conventional square wave AC TIG welding, the arc stability provided by the balled pure tungsten is superior. The WP332X7 offers a stable arc that maintains a consistent cone shape, ensuring high-quality weld beads with good cleaning action on the base material. As a non-radioactive material, it also eliminates the safety concerns associated with thoriated tungsten handling and grinding.