Why is it important to clean and point a tungsten electrode?

Cleaning and pointing a tungsten electrode are crucial for ensuring proper arc stability during gas tungsten arc welding (GTAW). When the tungsten electrode is clean, it has a smooth surface that allows for consistent electron emission, which is vital for maintaining a stable arc. Any contaminants, such as oils, dirt, or oxidation, can disrupt this process, leading to erratic or unstable arcs which can affect the quality of the weld.

Pointing the electrode prepares the end of the tungsten to effectively focus the arc. A pointed tip creates a smaller area from which the arc is generated, resulting in a more concentrated heat source. This focused arc promotes better control over the welding process, allowing for precise heat application to the base material. Without proper cleaning and pointing, the arc may be unstable, making it difficult to achieve a high-quality weld.