Good luck. No gunsmith or shop is going to be set up for it as it's a somewhat complicated process. It's a LOT more difficult than a simple weld on steel with a steel pin.
Maybe a small welding shop since it's not gunsmithing in the legal definition unless it's one of the guns that has the upper as the serialized "firearm."

A couple articles on welding titanium show just how much is involved,

https://www.millerwelds.com/resources/a ... -tube-pipe

https://weldguru.com/titanium-welding/# ... 20Titanium?

You can tig titanium outside an argon chamber, and even without back purging. You will definitely get some oxygen uptake, but this isn’t a fatigue critical application where embrittlement is a prime concern. Not sure what pin diameter is needed, but the first place to look for pin material is the titanium filler rod itself.

No filler rod on a pin and weld how I do them, I use a 3/32 drill bit and cut the back side of the bit off, grind it to be about 1/32 high in the hole and then when I make a puddle it flattens out and into the muzzle device.

I can see how that would work with this geometry and application. But I would add that steel cannot be welded to titanium for any structural application. The fusion zone would be full of very brittle Ti-Fe intermetallics.

Yep that's why I said finding a suitable pin would be the hardest part, I wasn't advocating doing it with a steel bit as a pin.

Yep that's why I said finding a suitable pin would be the hardest part, I wasn't advocating doing it with a steel bit as a pin.