Ultrasonic examination of dissimilar-metal welds in BWR and PWR plants

Ammirato, F.V.; Shankar, R.; Edelmann, X.

doi:10.1016/0308-0161(88)90090-7

Cited by 4 publications

(2 citation statements)

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“…The tears were then covered over using a thin layer of weld metal. Ammirato et al (6) produced mock-ups of dissimilar metal welds (DMW) typically found in boiling water reactors (BWR) and PWRs for a research project aimed at improving the examination of such welds. DMWs are produced to join carbon steel nozzles in the reactor vessel to stainless steel safe-ends or piping, as well as in many other locations, such as the control rod drive mechanism (CRDM) attachments, the pressuriser surge line, the residual heatremoval system, the pressuriser and the steam generator.…”

Section: Implanted Defectsmentioning

confidence: 99%

“…In order to evaluate the capability to detect intergranular stresscorrosion cracking (IGSCC), Ammirato et al (6) explored the possibility of producing samples containing true IGSCC. According to the article, preliminary investigations (10) demonstrated the feasibility of producing IGSCC in Inconel welds by exposing the stressed sample to appropriate chemical solutions.…”

Section: Grown Defectsmentioning

confidence: 99%

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Manufacturing of welded joints with realistic defects

Consonni¹,

Wee²,

Schneider³

2012

insight

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SIMULATIONIntentional weld defect or flaw specimens can be required for training purposes, developing new non-destructive testing techniques, qualifying non-destructive testing procedures, obtaining mechanical property data and in support of safety cases. The single most important criterion in producing defects or imperfections is that they must accurately simulate the flaws that can occur in welded components and structures. For this reason, in certain applications, saw cuts or machined slots, which are more easily detected, may not be considered acceptable as planar imperfections/defects for the purpose of NDT training or validation. Therefore, TWI has developed techniques for producing realistic imperfections/defects and, in the case of cracks, the desired morphology, including roughness and angles of tilt and skew to the surface. This paper describes the techniques used to obtain the abovementioned defects and, for the most commonly required defect types, the qualification procedure used by TWI. This consists of inspecting by surface NDT methods, ultrasonic or radiographic inspection and/or sectioning to demonstrate that the dimensional tolerance of the simulated imperfections (ie actual size of the imperfection versus required size) can be generally guaranteed to within ±0.5 mm in through-wall extent and ±1 mm in length.

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Section: Implanted Defectsmentioning

confidence: 99%

Section: Grown Defectsmentioning

confidence: 99%