An NDE report is only useful if the examiner, the inspector, and the auditor can all connect it to the right weld, on the right joint, made with the right material. A stack of RT films and UT reports with no cross-reference to the weld map or the material cert is not a complete quality record — it's evidence that testing was done, without proof of what was tested.
This distinction matters in practice. An ASME Code inspector reviewing a pressure vessel certification package will follow the chain from a specific joint to its NDE report to the film or data record. If that chain can't be followed without asking questions, the package is incomplete.
What Complete NDE Documentation Looks Like
A complete NDE record for a fabricated assembly links five elements to a common reference — the joint number:
- Weld map with joint numbers assigned to every weld
- NDE report referencing specific joint numbers, the technique used, and the acceptance result
- MTC for the base material at each joint — heat number traceable to the cert
- Filler material cert (electrode or wire lot) linked to the joint
- WPS/PQR number linked to the joint
All five documents reference the same joint number. The joint number is the anchor that makes the package navigable without reconstruction.
How to Build the Linkage: Step by Step
Step 1: Number Every Weld Joint
Before any material is cut or fit up, every weld joint on the isometric drawing or fabrication drawing gets a unique joint number. This number is permanent — it appears on the drawing, on the traveler, on the weld map, and on every NDE report associated with that joint.
Joint numbering is not optional in ASME work. What's often missing is the discipline to carry the joint number consistently through every downstream document.
Step 2: Record Heat Numbers at Material Release
When base material is assigned to a joint, the heat number goes on the traveler against the joint number. If a joint uses two base materials (e.g., a nozzle-to-shell weld), both heat numbers are recorded.
This record becomes the link between the MTC and the NDE report — both reference the joint number.
Step 3: Record Filler Material Lot Numbers at Welding
When welding begins on a joint, the filler material lot number is recorded on the weld traveler against the joint number. If the filler lot changes during a multi-pass weld (lot runs out), the change is noted: "joints 14–16: lot 4437A; joint 17 from lot 4437B."
This creates the link between the filler material cert and the NDE report.
Step 4: NDE Reports Reference Joint Numbers
When RT, UT, MT, or PT is performed, the NDE report references the specific joint numbers examined. Not the drawing number, not the vessel tag number — the joint number(s) from the weld map.
The NDE report also references the procedure number used, the acceptance criteria, the result, and the examiner's qualification level.
Step 5: Assemble the Package by Joint Number
The final documentation package is organized so that for any joint, all five documents can be retrieved by searching for the joint number. The package doesn't need to be organized by joint number — it needs to be indexed so the joint number search works.
The Common Gap: RT Film Identification
Radiographic testing introduces a specific linking problem. RT films are typically identified by the film number assigned by the examiner — a sequential number that appears on the film and in the examiner's log. Film numbers are not joint numbers.
The link between film number and joint number lives in the examiner's RT log or in the NDE report itself. If the RT log is filed separately from the NDE report, and the NDE report is filed separately from the weld map, the chain requires three documents to establish the connection between a specific film and a specific joint.
If any one of those three documents is missing from the final package, an auditor cannot make the connection without requesting the missing document. That request constitutes a package deficiency.
The fix: include the examiner's RT log — or a summary of it — in the final documentation package. Alternatively, require that the NDE report explicitly states both the film numbers and the joint numbers they cover, so the connection is self-contained in a single document.