AWS Certified Welding Inspector — FundamentalsInspector Duties and ResponsibilitiesMedium
During a post-weld visual inspection of a critical pressure piping system, a CWI identifies a linear indication approximately 1/16 inch (1.6 mm) long originating from the toe of a fillet weld. The applicable code is ASME B31.3. What is the most appropriate initial action for the CWI?
- ADocument the finding and require further non-destructive examination (NDE) to determine its nature and depth.
- BImmediately reject the weld and initiate a Non-Conformance Report (NCR).
- CAccept the weld, as linear indications of this size are generally considered insignificant in fillet welds.
- DGrind out the indication and re-inspect, then allow welding to proceed if it is removed.
Show answer & explanationAnswer & explanation
Correct answer: A. Document the finding and require further non-destructive examination (NDE) to determine its nature and depth.
A linear indication at the toe of a fillet weld, even small, can be a crack, which is a critical defect in pressure piping. ASME B31.3 typically requires no cracks. Further NDE, such as liquid penetrant testing (PT) or magnetic particle testing (MT), is necessary to confirm if it is a surface crack and to assess its severity before making a final disposition.
Why the other options are wrong
- B. While it may lead to rejection, immediate rejection without further investigation is premature. NDE provides the necessary data for a definitive decision.
- C. Linear indications, especially in critical applications like pressure piping, are rarely insignificant and often indicate cracks.
- D. Grinding without understanding the defect's nature can mask it or worsen the situation. Further NDE is needed first.
Post-Weld Linear Indication
A visual sign of a defect that is longer than it is wide, often indicative of a crack, which requires further investigation, especially in critical applications.
- Can signify a crack, which is a severe defect.
- Requires further NDE (PT/MT) to confirm nature and depth.
- Critical in pressure retaining components (e.g., ASME B31.3).
Memory trick: See a Line? Further Define!