How is the tungsten electrode typically prepared before use in GTAW?

In Gas Tungsten Arc Welding (GTAW), preparing the tungsten electrode properly is crucial for achieving a stable and effective arc. Grinding the tungsten electrode to a point is the standard preparation method because it helps to focus the arc and improve the precision of the welding process. A pointed tungsten tip allows for a more concentrated arc, which is essential for welding thin materials or when precision is important. The geometry of the tungsten tip influences the electrical and thermal characteristics of the arc, thereby enhancing the weld quality.

Other options do not align with the standard practices for preparing a tungsten electrode. While cleaning the electrode can be necessary, it doesn't specifically enhance the arc stability in the same way that a pointed tip does. Similarly, coating the electrode with a lubricant or heating it to extreme temperatures are not typical procedures in tungsten electrode preparation for GTAW. Therefore, the main step that effectively prepares the electrode for optimal welding performance is grinding it to a point, making it the correct answer.