Label for what Landon?
If you are referring to welder's name (ID), process, position, etc, I generally follow this example: BB, 472758, FCAW-S, vert. I also log all their information on a notepad: Employer/company, name, address, date tested, welding parameters, take photo to include on WPQR, contact info.
With a record keeping system, you could just number the plates. Anything to keep them properly identified with the correct person and test.
Now, I don't deal with ASME so my application is for mostly D1.1, D1.3, D1.4. The code does not mandate a photo, just one of my personal touches on the cert, hard to argue ID with a photo placed on the front or back.
He Is In Control, Have a Great Day, Brent
I've found it useful to write on the test plate the information I want included in the lab report, and how I want the plate tested.
PQR or WPQR ID #
material / position
Welder name or stamp#
Transverse, longitudinal, cvn, side or face/root bend
Code or Spec.
This seems to work as a backup in case the details listed on the purchase order don't make it to the lab.
Its amazing how easy it is for a lab to screw up your order...
Tim