I can't tell but it looks to me like there is a burr on the inside of that fitting. I would use some new sandpaper and clean it up a bit, mostly for safety, I would not want to cut my finger while cleaning my kettle.
They need to be cleaned up with a sanding disc, then polished with a scotch brite pad (buff disc). They will rust if you don't.
For everybody that said back purging isn't necessary, sorry, but you're just wrong.
Would I call that quality welding? No.
Will it be OK for a boil kettle? Sure.
Obviously the person who welded the ferrules did not shield the back side of the weld.
That is why you see that dirty gray appearance on the inside of the ferrules. The stainless is actually oxidized in that area and is no longer corrosion resistant.
If it doesn't leak than you'll be OK, but those welds can be done correctly and with a much nicer outcome.
Hope you didn't pay too much to have that done.
Don't sweat it though.