Which of the following can negatively affect the quality of a GTAW weld?

The use of improper filler metal is crucial in determining the quality of a GTAW weld. Each type of filler metal is designed for specific base metals and applications. When the wrong filler metal is used, several issues can arise, such as poor mechanical properties, reduced corrosion resistance, and inadequate fusion with the base material. The filler metal must match the composition and properties of the base metals being welded to ensure a strong and reliable joint.

In contrast, welding at a constant speed is generally a best practice as it helps maintain consistent heat input, which is essential for achieving uniform weld beads. Keeping the electrode arc length consistent is also vital because it helps control the heat delivered to the weld area, preventing defects such as overheating or undercutting. Using clean base metal is critical for ensuring proper fusion and preventing contamination, which can lead to inclusions or weak spots in the weld. Thus, the proper selection of filler metal is integral to the success and quality of a GTAW weld.