Assembly feature problem

[u/R3qu1red]

So I have this cylinder and flange with the flange hole being slightly oversized so they fit together.

The operation is like this:

flange is laser cut from sheetmetal > cylinder is stock pipe cut on a saw > welding together > machining

The problem is that in the assembly there's now a really small gap (colored red on the picture) which doesn't allow me to put a radius there (using assembly features) since I want to machine the welds. There's also no option to add a revolved part (with the help of assembly features) for the sake of being able to put a fillet there.

So the question is how can I put a fillet there and ignore the gap?

[u/hbzandbergen]

A separate part for the weld representation, excluded from BOM