What tool is commonly used to check the electrode tip for contamination?

The use of a magnifying glass to check the electrode tip for contamination is highly effective due to its ability to provide a close-up view of the electrode. When performing Gas Tungsten Arc Welding (GTAW), ensuring that the electrode tip is free from contaminants is crucial for achieving a clean weld. Contaminants such as oil, dirt, or oxidation can adversely affect the weld's quality, leading to issues like poor arc stability and incomplete fusion.

A magnifying glass allows the welder to inspect the surface of the electrode visually, enabling them to identify any potential contaminants that could compromise the welding process. This form of visualization is particularly important since even small particles can lead to significant defects in the weld.

The other tools mentioned, such as a welding probe, measuring tape, and digital micrometer, serve different purposes. A welding probe is typically used for checking the pocket depth of the torch or other components but is not specifically designed for examining the surface cleanliness of an electrode. A measuring tape is primarily for measuring distances or sizes, while a digital micrometer is used for precise measurements rather than cleaning checks. Therefore, the magnifying glass stands out as the most appropriate tool for verifying the cleanliness of an electrode tip in GTAW applications.