Ok, I have no experience in weldments at all !!!

So with that said, why when I have a round post protruding out of a flat plate

and I try to do a fillet bead weeld between them doesn't it work?

I pick can either pick the round post for "Face Set1" or the flat plate

top surface as such, but it wont recognise the second face for which ever one

I don't select.  Why is this?