What type of metals can argon be used to weld?

Argon is an inert gas commonly used as a shielding gas in Gas Tungsten Arc Welding (GTAW) processes. Its primary purpose is to protect the weld pool from atmospheric contamination during the welding process, which can negatively affect weld quality.

The correct answer identifies that argon can be used to weld mild steel, aluminum, and titanium. Mild steel benefits from argon's inert properties, which help achieve a clean weld with high arc stability. Aluminum, being a non-ferrous metal, is similarly suited for argon shielding, as it allows for excellent control over the weld pool and helps in preventing oxidation. Additionally, titanium, which is known for its reactivity at high temperatures, requires a protective atmosphere to prevent contamination and maintain weld integrity, making argon an ideal choice.

This versatility of argon to effectively shield various types of metals during the welding process emphasizes its importance in producing high-quality welds across different materials in GTAW applications.