Classification
AWS A5.12 : EWP

General Properties and Application Areas
Pure tungsten electrodes have an AWS (American Welding Society) classification of EWP and typically are less expensive than their “alloyed” counterparts. They contain 99.50% tungsten and have the highest consumption rate of all electrodes, and provide a clean, balled tip when heated. This shape offers especially good arc stability for AC welding with a balanced waveform. Pure tungsten electrodes also provide good arc stability for AC sine wave welding on aluminum and magnesium. They are not, however, used for DC welding.