Forum Technical Discussions      Re: Code Case 2235 examination volume Posted by: Manfred Richter (PID_3413), E-mail: Address, on December 12, 2008 at 20:03 : In Reply to: Code Case 2235 examination volume posted by : David Mackintosh , E-mail: Address, on December 12, 2008 at 18:23 : Code Case 2235-9, and now ASME VIII Div.2 Part 7 states that "Alternatively, examination volume may be reduced to include the actual heat affected zone (HAZ) plus 6 mm (1/4 in) of base material beyond the heat affected zone on each side of the weld..." . As the welds shall be approved through a WPS and macros should be done, the HAZ could be measured and the additional scan avoided. I think this is one of the reason to not do additional or Y scan. Regards, Manfred ----------- Start Original Message ----------- : Code Case 2235 paragraph (a) requires that for t<= 8 inch the examination include the volume of the weld plus the lesser of 1 inch or t on each side of the weld. : In most cases this would require additional TOFD scans with the probe pair offset (see sketch), which in turn might require the weld cap to be ground flat. In other words, it is very difficult to cover the required volume using TOFD alone. : In practice, I believe many NDT examiners are carrying out TOFD without worrying about covering the edges of the examination volume. Can anyone confirm this? Or are there examiners who make the extra effort to cover the entire zone? : Supplemental UT is used to cover the TOFD dead zones. Perhaps supplemental UT should also be used to cover the entire width of the examination volume, thus removing the necessity of grinding the weld cap flat for TOFD. : Thanks, : David Mackintosh ------------ End Original Message ------------ Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Code Case 2235-9, and now ASME VIII Div.2 Part 7 states that "Alternatively, examination volume may be reduced to include the actual heat affected zone (HAZ) plus 6 mm (1/4 in) of base material beyond the heat affected zone on each side of the weld..." . As the welds shall be approved through a WPS and macros should be done, the HAZ could be measured and the additional scan avoided. I think this is one of the reason to not do additional or Y scan. : Regards, : Manfred : : : Code Case 2235 paragraph (a) requires that for t<= 8 inch the examination include the volume of the weld plus the lesser of 1 inch or t on each side of the weld. : : In most cases this would require additional TOFD scans with the probe pair offset (see sketch), which in turn might require the weld cap to be ground flat. In other words, it is very difficult to cover the required volume using TOFD alone. : : In practice, I believe many NDT examiners are carrying out TOFD without worrying about covering the edges of the examination volume. Can anyone confirm this? Or are there examiners who make the extra effort to cover the entire zone? : : Supplemental UT is used to cover the TOFD dead zones. Perhaps supplemental UT should also be used to cover the entire width of the examination volume, thus removing the necessity of grinding the weld cap flat for TOFD. : : Thanks, : : David Mackintosh ------------ End Original Message ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help