What is a "keyhole" technique in GTAW?

The keyhole technique in Gas Tungsten Arc Welding (GTAW) refers to the approach where the welder penetrates the base material completely, creating a "keyhole" effect in the weld pool. This technique involves maintaining a concentrated arc that generates significant heat, allowing the welder to efficiently control the weld pool and achieve deeper penetration. By doing so, the keyhole technique enables better fusion of the materials being welded and allows for a more effective and clean weld, particularly in thicker materials or when welding in certain positions.

This method is particularly advantageous when there is a need for a strong joint or when the materials are difficult to weld, as it facilitates better control over the weld pool and reduces the risk of defects. With the precise control afforded by the keyhole technique, welders can achieve high-quality welds with proper heat management, making it a valuable skill in the GTAW process.