Before GMAW was developed, GTAW weldable materials were primarily which type?

• A. Aluminum
• B. Reactive Materials (prone to contamination at welding temps)
• C. Titanium
• D. Magnesium

Answer: (B)

GTAW relies on a very pure shielding environment to keep the weld pool from reacting with air, so it excels with materials that are easily contaminated at welding temperatures. Before GMAW existed, the metals most commonly welded with GTAW were reactive metals—those that oxidize or form unwanted compounds quickly in the molten state, making contamination a major concern. The precise heat control of GTAW plus a strong inert shielding gas allowed clean, high-quality welds on these reactive metals, such as aluminum, titanium, and magnesium. In short, the type of materials GTAW was best suited for, prior to the advent of GMAW, were reactive materials that are prone to contamination at welding temps.