Which statement is NOT a consideration when selecting GTAW filler metal?

• A. Metallurgical compatibility
• B. Intended service requirements
• C. Cost
• D. Electrode color coding

Answer: (D)

When choosing GTAW filler metal, you focus on how the filler alloy will interact with the base metal and the service environment. The filler should be metallurgically compatible to maintain the desired weld properties, such as strength, toughness, and corrosion resistance, and it should meet the demands of the intended service, including temperature and load conditions. Cost is also a practical consideration, balancing performance with expense.

Electrode color coding, on the other hand, is a labeling system for tungsten electrodes, not filler metal. The color bands indicate the electrode's composition and type, but they do not guide which filler metal to use. The filler metal is identified by its own designation and packaging, not by the electrode color.