What’s unusual about tungsten are the kinds of exotic alloys used to influence its performance in TIG welding. In order to distinguish one from another, a color code has been developed. Here are the most common choices, their colors, AWS and ISO numbers, and what they’re used for:
Pure Tungsten – EWP — Used primarily for AC welding of aluminum and magnesium at low currents. The tip of the tungsten is balled before using. (ISO = W)
Lanthanated 1.5% – EWla-1.5 –General purpose electrode used for steel and stainless steel at a wide range of current. Often used as a cheaper, safer substitute for thoriated tungsten. (ISO = WL15)
Ceriated 2% – EWTh-2 — Can achieve high currents with good arc stability. Another substitute for thoriated tungsten. (ISO = WC20)
Thoriated 2% – EWTh-2 — An expensive and radioactive metal. Use care in grinding (i.e. wear a dust mask), keep your skin covered and avoid contact with the metal when it’s heated. (ISO = WT20)
Zirconiated 2% – EWZr-2 — Another option for AC welding, zirconium is preferred in situations where resistence to contamination is paramount. The tip of the tungsten is balled before using. (ISO = WZ3)
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