Proper Tungsten Preparation For Tungsten Electrodes I

Depending on the type of tungsten electrode, preparation consists of creating one of three shapes: balled, pointed or truncated. Following are recommendations for each:

Balled Tungsten Electrodes
The balled shape is common for pure tungsten electrodes, particularly for the AC process on sine wave and conventional squarewave GTAW power sources.  To ball the tungsten electrode, apply the AC amperage recommended for the electrode diameter. The ball will form itself. In order to reduce the risk of the tip falling off or causing arc instability, the diameter of the balled end should not exceed 1.5 times the diameter of the electrode. For example, a 1/8-inch electrode should form, at the most, a 3/16-inch diameter end.

Pointed Tungsten Electrodes
A pointed shape can be used for pure, ceriated, lanthanated, rare earth, and thoriated tungsten electrodes when using inverter AC and DC welding processes. It also works well for welding with lower currents on thinner materials, as it directs the welding current into focused arc and helps prevent them from distorting. It is not recommended to use a pointed tungsten electrode for higher current applications since the tip can come off, leading to contamination.

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