A weld defect found during final inspection is not only a fabrication problem. It becomes a handover risk when the repair, its cause, and the follow-up inspection cannot be traced to a specific weld. A clear PP weld repair documentation process keeps the equipment status visible to the fabricator, inspector, and owner.
This article focuses on the repair and nonconformance lifecycle after a defect is identified. It complements, rather than replaces, the pre-shipment PP welding joint inspection checklist, el welding-rod traceability guide, and the project-specific inspection and test plan (ITP).
Good PP weld repair documentation makes the release decision auditable: the person opening the NCR, the person performing the repair, and the person accepting the result should be visible in one evidence chain.
When should a PP weld repair become an NCR?
Use the project requirement as the trigger, not the appearance of the word “epair”alone. A local correction may be recorded in a weld log when the procedure explicitly allows it and the original acceptance requirement remains satisfied. Open an NCR when the weld is outside an acceptance criterion, a drawing or approved procedure was not followed, the repair changes the approved configuration, or the inspector cannot release the item with the available evidence.
Typical triggers include a visible crack, incomplete fusion, an unacceptable void or undercut, a damaged edge, an unapproved welding rod, a repair outside the defined weld-access area, or a missing inspection record that prevents objective release. The NCR should describe the requirement that was not met. “Bad weld”is not a useful finding; “Weld W-17 has a visible discontinuity at the tank-to-nozzle transition and does not meet the project visual acceptance criterion”is traceable.
Give every repair a location that another person can find
The most useful repair record starts with location control. Assign a weld number, component number, or grid reference that matches the drawing and weld map. Add orientation, station, nozzle or fitting reference, and a photo reference when the geometry is difficult to describe in words. If the repair covers a long seam, identify the start and end points rather than writing “side seam.”/p>
| Record field | What to capture | Why it matters at handover |
|---|---|---|
| Unique location | Weld ID, component, drawing/grid reference, orientation, and photo ID | Lets the reviewer find the exact repaired area. |
| Original finding | Date, inspector, method, acceptance criterion, defect description, and hold status | Preserves the condition that led to the repair. |
| Disposition | Repair, use-as-is, reject, replace, or engineering/customer concession | Shows who decided how the nonconformance was controlled. |
| Repair evidence | Approved method, welder, rod identity, preparation, photographs, and completion date | Connects the corrective work to the actual component. |
| Verification | Reinspection or retest, result, inspector, date, and report number | Demonstrates that the repaired condition was checked. |
| Release | NCR close-out, approval, dossier revision, and remaining restrictions | Prevents an unresolved item from appearing as accepted equipment. |
Use this field set as the minimum PP weld repair documentation index, then add any customer, code, or site fields required by the project specification.
Separate correction, root cause, and corrective action
A repair makes the individual weld conforming; it does not automatically explain why the defect occurred. Keep three questions separate in the NCR:
- Correction: What was done to control the nonconforming weld right now?
- Cause: Which process, material, handling, design, or inspection condition allowed the defect to occur?
- Corrective action: What change will reduce the chance of recurrence on this project or on similar welds?
For example, a repair may remove a damaged section and re-weld it. The cause review may find that the component was forced into alignment, the welding rod was not positively identified, the joint was contaminated, or an inspection hold point was missed. The corrective action might be a fit-up check, a revised handling step, a material segregation rule, or an additional inspection hold point. Record the evidence used to close that action; do not close it with a sentence such as “pperator reminded.”/p>
This approach follows the general quality-record principle that documented information provides evidence of verification and corrective action. A controlled PP weld repair documentation file applies that principle to the actual weld, component, and handover decision. ISO 9000 terminology defines corrective action around eliminating the cause of a nonconformity, while the project specification determines the actual acceptance and retention requirements.
What PP weld repair documentation should contain
Thermoplastic weld repairs are sensitive to the material and process used. The record should identify the PP sheet or component grade where specified, the welding-rod grade, the rod batch or lot when traceability is required, and the welding process used for the repair. Link the repair to the approved procedure or work instruction without inventing values that are not in the project documents.
QEEHUA’s practical review point is to keep sheet identity, rod identity, and weld identity on the same traceability chain. A certificate in a material folder is not enough if the reviewer cannot tell whether it belongs to the repaired nozzle, seam, or reinforcement. Use the existing PP welding-rod selection guide for application inputs, then preserve the actual supplied identity in the repair record.
Attach enough process evidence to make the repair reproducible: the repair procedure revision, welder or operator identification, surface preparation, equipment identification when required, and the start/completion dates. This PP weld repair documentation should also show whether the repair changed geometry, access, drainage, reinforcement, or a customer interface; route such changes through the project change or technical-query process before release.
Show that the repaired weld was re-evaluated
A repair record is incomplete until the repaired area is inspected against the same requirement that caused the NCR, plus any additional check required by the approved repair method. The inspection scope is project-specific. It may include visual examination, dimensional checks, leak or functional testing, or another agreed method. Do not claim that one test is automatically required for every PP weld.
Record the result as pass, fail, or conditional release with the acceptance basis, not only “checked.”If a retest is not required, state who made that decision and cite the applicable procedure, ITP, or approved disposition. If the project references EN 13100-1 visual examination of thermoplastic welded joints, use the controlled project copy to confirm the required report fields and acceptance method. If the repair fails again, keep the original NCR linked to the subsequent NCR or repair cycle so the history is not overwritten.
Build the handover package around a closed NCR register
Before equipment handover, reconcile the NCR register with the weld map, inspection reports, drawings, and packing or shipping release. The register should show every item as closed, accepted under a documented concession, or clearly carried forward with an owner and due date. “Ppen”or blank status is not a release status.
| Handover check | Evidence to place in the dossier |
|---|---|
| All repair locations identified | Latest weld map, marked-up drawing, and photo index |
| Disposition approved | Signed NCR or approved concession with responsible authority |
| Repair completed to the right revision | Repair report, procedure revision, operator identity, and dates |
| Reinspection or retest completed | Linked report with acceptance basis and result |
| Traceability preserved | Sheet/component and welding-rod records linked to the weld ID |
| Document control complete | Revision history, index, file names, and final release signature |
Keep the repair dossier separate from the general PP exhaust-duct handover document package when the equipment has a different scope, but use the same principle: every acceptance statement should point to objective evidence. For a broader project structure, the PP sheet selection, fabrication, and applications hub provides the material and fabrication context.
Use a repair video as context, not as acceptance evidence
The following QEEHUA laboratory video shows a general PP material verification activity. It helps explain why material and process evidence belong in a quality file, but it does not prove that a particular weld repair is acceptable. Acceptance must come from the project’s approved inspection and test requirements.
Referencia de vídeo: “PP Sheet Cutting Process: Cutting Motor and Cut Saw | QEEHUA” is a general cutting-process reference; use the approved repair record and project acceptance plan for weld release.
Final pre-handover review
Run this PP weld repair documentation close-out review with the project quality and fabrication teams before the release signature.
Use this short review with the project quality and fabrication teams:
- Can every repaired weld be found from the weld ID, drawing, or photo reference?
- Does each NCR state the unmet requirement and the disposition authority?
- Are the PP sheet/component and welding-rod identities linked to the repair?
- Does the repair report identify the method revision, operator, and completion date?
- Is reinspection or retesting recorded against an acceptance basis?
- Does the final dossier show the current revision and a closed or approved carried-forward status?
- Are any open deviations or concessions clearly identified with an owner and due date?
If an answer is no, hold the handover package and resolve the evidence gap before asking the customer to sign. QEEHUA can review a project’s weld map, NCR register, and PP weld repair documentation together with the acceptance plan so the dossier reflects the actual fabricated equipment.
Preguntas frecuentes
When should a PP weld repair trigger an NCR?
Open an NCR when a weld fails a drawing, approved procedure, inspection plan, or agreed acceptance criterion; when the repair changes the approved configuration; or when missing evidence prevents release. A minor correction may remain in a weld log only when the project procedure explicitly permits it and the original requirement remains satisfied.
What evidence should a PP weld repair record include?
A PP weld repair documentation record should include the unique weld or component location, original defect, disposition, approved repair method, operator, PP sheet and welding-rod identity when required, before-and-after evidence, reinspection or retest result, and the close-out approval. Link every record to the current drawing or weld map.
Does a repaired PP weld always need a retest?
Not automatically. The required reinspection or retest depends on the project specification, repair procedure, ITP, service duty, and acceptance criteria. If a test is waived, record the approving authority and the basis for that decision instead of leaving the field blank.
Can a photograph replace a closed NCR?
No. A photograph can support the record, but it does not show the unmet requirement, disposition, cause, reinspection result, or release authority. Use it as linked evidence within a controlled NCR and handover package.
Need a PP fabrication handover review?
Send the weld map, NCR register, repair reports, and project acceptance plan. QEEHUA can help structure the PP weld repair documentation and identify traceability or close-out gaps before equipment handover.
