Welding Inspection and Certification Fundamentals
Welding Inspection and Certification Fundamentals
The CAWI exam tests the inspector's role, authority, and limits in welding inspection. An inspector verifies that work meets the contract documents, not personal preference. Certification is third-party evidence that a candidate passed an examination; qualification is demonstrated ability; employer authorization is what allows inspection of a specific scope. For NDT, ASNT SNT-TC-1A requires an employer written practice and method/level certification.
Core rules
- Contract documents govern. Identify the code, edition, addenda, project specification, and order of precedence before work starts.
- The inspector does not design, approve repair methods, or override the engineer. A nonconformance report records facts; disposition belongs to the responsible engineering authority.
- Plan inspection with hold points, witness points, and review points. A hold point requires release before work continues.
- Verify identity and traceability of base metal, filler, WPS, welder qualification, consumable storage, and calibration status.
- Record observations promptly, objectively, and legibly. Include location, quantity, method, and acceptance basis. Never backdate, alter, or sign for work not inspected.
- Avoid conflicts of interest. Do not accept verbal changes without controlled documentation.
Worked example
A contract specifies AWS D1.1-2020. The shop has a 2015 copy, and the inspector's personal copy is 2020. The correct basis is the contract's 2020 edition. The inspector checks the project specification for additional requirements and follows the contract's order of precedence. If a drawing detail conflicts with the code, the inspector documents the conflict and requests a clarification; the inspector does not choose the easier document. The report cites D1.1-2020 and the specific clause used.
Traps
Using the latest code edition when the contract cites an older one; treating certification as unlimited authority to inspect any code or product; writing repair as the NCR disposition; accepting verbal changes; and signing for work not witnessed. Vision requirements are also fair game: corrected near vision to Jaeger J-2 at 12 in and color perception.