T3327GT2 - CK Worldwide 2% Thoriated Tungsten Electrodes, 3/32" x 7" (Red) - 10 Pack

High-Performance DC TIG Welding Electrodes

The CK Worldwide T3327GT2 2% Thoriated Tungsten Electrodes represent the traditional standard for Direct Current (DC) TIG welding applications. Identified by their red color code, these electrodes are manufactured to meet AWS classification EWTh-2 (ISO designation WT20). They are composed of approximately 97.3% tungsten and 1.7% to 2.2% thorium oxide (ThO2). This specific metallurgical composition is designed to lower the electron work function of the electrode, facilitating easier electron emission compared to pure tungsten.

Operational Characteristics and Metallurgy

The addition of thorium oxide provides several distinct operational advantages in industrial environments. The dispersed oxide allows the electrode to carry significantly higher current loads without degrading, while simultaneously reducing the tendency of the tip to spit or erode. This results in a medium erosion rate and a stable arc that is easier to control during precision fabrication. The electrodes offer exceptional DC arc starting capabilities, making them a staple for pipe welding and critical component fabrication where weld integrity is paramount. They are specifically optimized for use with transformer-based constant current power sources.

Material Compatibility and Applications

These 3/32" diameter electrodes are engineered for welding on non-corroding steels, titanium alloys, nickel alloys, and copper alloys. While they are capable of AC welding on thin gauge aluminum in specific setups, they are primarily and most effectively used in DC Electrode Negative (DCEN) polarity for ferrous metals. The 7-inch length is standard for most manual and automatic TIG torches.

Safety and Handling

It is important for operators to be aware that thoriated tungsten contains low-level radioactive material due to the thorium content. While the radiation is minimal, safety precautions should be observed during grinding to avoid inhaling dust. Proper ventilation and dust extraction systems are recommended when preparing the electrode points. Despite the emergence of non-radioactive alternatives like lanthanated or ceriated tungsten, 2% thoriated remains a preferred choice for many industrial users due to its proven track record of reliability and high-amperage performance.