I'm pretty sure I have the right answer, but i never hurts to post questions or comments.

1595 is the code that outlines welder qualification testing procedures.  It gives acceptance/rejection criteria for all forms of NDT and DT accept for visual testing? At best it mentions that visual testing is required for all welds, but it doesn't even call out a spec? 

I referenced std 2219 as that is what calls out 1595.

The issue came up when I was training some welders and we wanted to confirm if their test plate would be 1595 acceptable. It passed x-ray, but 1595 doesn't state the visual requirements. Drop-thru, under cut etc.