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TIG welding titanium can teach you a lot about other metals.
One thing you need above all else for titanium is better gas shielding than you can get from standard cups.
One great way to get better gas shielding is with a large cup like the furick jazzy10, fupa12, mk14, and BBW

The 3 things that make the most difference on stainless steel or chromoly apply to titanium even more.

1. keep the arc length to equal or less than tungsten diameter

2, shield the hot tip of the wire with argon

3, limit torch angle