Rotated Parts not Welding

I am trying to weld 2 parts - one is rotated and one is not.
When they touch each other no welds appear, and when I try to create a new weld it just messes up things even more…
image
(I am trying to weld the blue and gray parts)
Can someone tell me how to fix this?

Are you using a manual weld or a weld constraint?

I don’t know what are weld constraints, I do know what “Weld” is however.
So no, I don’t have any weld constraints.