Proper Tungsten Preparation For Tungsten Electrodes II

To grind the tungsten electrode to a point, use a grinding wheel (Borazon® or diamond) specially designated the purpose to help prevent contamination. Grind the tungsten electrode straight on the wheel  (i.e. not at a 90-degree angle) to ensure that the grind marks run the length of the tungsten electrode, which reduces ridges that can lead to arc wandering. To ease arc starting and ensure a focused arc, grind the taper to a distance of no more than 2.5 times the electrode diameter (e.g. the taper on a 1/8-inch tungsten electrode should be 1/4 – 5/16-inches long).
Note: when grinding thoriated tungsten electrodes, make sure to control and collect the dust, have an adequate ventilation system at the grinding station and follow manufacture’s warnings, instructions and MSDS.

Truncated Tungsten Electrodes
For higher current applications, a truncated or flat tip works well. The flat land helps prevent the tungsten electrode from being transferred across the arc and/or from balling. Start by grinding the tungsten electrode to a taper (as explained above) and then grind a .010- to .030-inch flat land on the end.

Selecting the right tungsten electrode for the material being welded and the power source available are good first steps in ensuring positive GTA welding performance. Take the time to learn which is best for the application at hand and learn the proper technique for preparation. Doing so can minimize problems with arc starting and stability, contamination and more.

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