How to Select Tungsten Electrode in TIG Welding (I)

It is crucial to Choose a tungsten electrode in successful gas tungsten arc welding (GTAW) or Tungsten Inert Gas welding (TIG).  The electrode choices are pure tungsten (Green), 2% thoriated (Red), 2% ceriated (Gray or Orange), 1.5 percent lanthanated (Gold) or 2% lanthanated (Blue) and rare earth. In addition, tip preparation is critical.

These nonconsumable electrodes are available in a range of sizes and lengths and are composed of either pure tungsten or an alloy of tungsten by other rare-earth elements and oxides. Choosing an electrode for GTAW depends on the base material type and thickness and whether you weld with alternating current (AC) or direct current (DC). Which one of three end preparations you choose, balled, pointed, or truncated, also is crucial in optimizing the results and preventing contamination and rework.

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