EWLa-1.5 designates a tungsten electrode containing 1.3–1.7 wt.-% of dispersed lanthanum oxide (La2O3) for enhanced arc starting and stability, reduced tip erosion rate, and extended operating current range. These electrodes can be used as nonradioactive substitutes for 2% thoriated tungsten as the operating characteristics are very similar. Lanthanated tungsten can be used for both dcen and ac applications.
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