Some questions about spawn a destructible building:

Hey guys,I am a new learner to UE4 and I want to spawn a destructible building in my game.
I attach some components such as walls,pillars and ceiling to my actor,but I don’t know how to weld them together.
once I enable the simulate physics,they will break apart.

Thus I come here for help,I wonder if there are some methods to weld them together.
thanks a lot.