What shielding gas should be used to mig titanium?

When MIG welding titanium, 100% argon is typically used as the shielding gas. Argon provides an inert atmosphere that prevents oxidation and contamination of the weld. In some cases, a mixture of argon with a small percentage of helium (up to 25%) may be used to improve heat transfer and penetration, especially for thicker materials. It's essential to maintain a controlled environment to achieve high-quality welds on titanium.