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Technical Discussions
Marco Camacho
Mexico, Joined Aug 2019, 2

Marco Camacho

Mexico,
Joined Aug 2019
2
15:52 Aug-19-2019
LINEAR O SECTORIAL SCAN ?

Hello experts,

could you tell me what considerations and codes apply to know if I should use a linear or sectorial scan.

thanks..

 
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Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1307
17:32 Aug-19-2019
Re: LINEAR O SECTORIAL SCAN ?
In Reply to Marco Camacho at 15:52 Aug-19-2019 (Opening).

Marco, perhaps the most prescriptive standard for automated phased-array UT testing is ISO 13588. In that document Table 2 describes the various setups that MAY be used for weld inspections. What you refer to as linear scan is, I think, referred to as E-scans (abbreviation for electronic scan). The text above the Table 2 indicates that if you are using just amplitude to evaluate indications then the incident angle of the beam with respect to the weld bevel is not to exceed 6°. For small thicknesses the E-scan may be helpful to achieve this condition, but most probes will not have a large enough footprint to provide full coverage in a single line scan with a fixed standoff. For thicker welds people prefer to use 2 S-scans with different standoffs from each side or a combination of S-scan and E-scan from each side (although for Testing Level A ISO 13588 allows scanning from a single side).
ASME is not quite so prescriptive and requires that you provide a Scan Plan showing that the technique you are using provides adequate volume coverage. No specific requirements are stated in ASME regarding which scanning pattern to use.

 
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