How should the filler metal be added during the GTAW process?

The filler metal should be added gradually into the weld pool during the GTAW process to ensure proper melting and fusion with the base metal. This technique allows for controlled deposition, which is crucial for maintaining the quality of the weld. Gradual addition helps to prevent issues such as overheating or underfilling, which can occur if too much filler is added at once or if the filler is introduced too rapidly. By introducing the filler metal slowly, the welder can monitor the appearance of the weld pool and adjust the amounts according to the needed depth and width of the bead, ensuring strong and clean welds.

The other methods mentioned are not effective for achieving a quality weld. Adding filler metal with high pressure could introduce contamination or cause too much disturbance in the weld pool, while waiting until the weld pool cools before adding filler would result in a poor bond and does not adhere to the process norms. Adding large amounts of filler quickly can lead to inconsistencies in the weld and may result in defects such as porosity or incomplete fusion. Hence, careful and gradual introduction of the filler metal is essential for successful GTAW operations.