Here is a good guide for Fallout 76 Black Titanium and how to get Fallout 76 Excavator power armor.
Fallout 76 won’t be out until November 14th so if you want to get into the game fully prepared, the beta was a good way to test out waters. Some players have managed to get a decent chunk of experience and knowledge and since game progress carries over to the final game, it will benefit them greatly. Here is a nice discovery made by a Reddit user on Black Titanium and Excavator Power Armor location in Fallout 76,
How To Farm Fallout 76 Black Titanium And Get Fallout 76 Power Armor
You can get an Excavator power armor in Fallout 76, but to unlock it, Black Titanium is needed. There is a neat trick to get it though, and it involves going to a Town called Welch. It is located at the southern part of the world map between Hornwright Air Purifier Site 3 and Beckley.
You can find a vending machine among ruins and Molemans which rewards you with mining maps. Each map that you can get leads you to a location with at least 10 to 20 Black Titanium along with other rewards like bottle caps. There are a total of three maps which will cost you 300 bottle caps.
The other to get Black Titanium is through a Legendary Deathclaw. They can be found north of the Mothman Museum in an Island. You can also similarly get another Excavator armor by completing an event in Welch without having to farm Black Titanium.
Fallout 76 will release on November 14 for the PS4, Xbox One, and PC.