Why would I use Ceriated or Thoriated tungsten instead of Pure?

With the introduction of new power source technologies, the use of pure tungsten is decreasing.
Pure tungsten melts at a lower temperature causing it to easily form a rounded ball at the tip. When the ball grows too large, it interferes with your ability to see the weld puddle and causes the arc to become unstable.
Ceriated tungsten can withstand higher temperatures and works very well with the new squarewave and inverter machines for the following reasons:
Holds a point longer and starts well at low amperages.
Can be used on both AC and DC polarities. When welding aluminum, it has become very acceptable to grind a point on ceriated tungsten (especially when welding on thinner materials).

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