What is one of the problems associated with excessive current on tungsten?

Excessive current on tungsten leads to electrode erosion, which is a significant problem in gas tungsten arc welding (GTAW). When the electrical current exceeds the tungsten electrode's capacity, it causes the tungsten to heat up excessively. This overheating results in the gradual melting and consumption of the tungsten tip, leading to erosion. As the electrode erodes, it can change the shape and performance of the arc, negatively impacting the stability of the weld process.

Maintaining the appropriate current is crucial, as it not only protects the integrity of the tungsten electrode but also ensures that the weld remains consistent and of high quality. Furthermore, effective shielding gas is essential for preventing contamination of the weld area, and excessive current does not eliminate the need for it. Therefore, electrode erosion is a clear consequence of high current levels that can ultimately affect the overall welding operation.