Forum Technical Discussions Re: Porosity on TOFD inspection Posted by: Ed Ginzel    (PID_67), E-mail: Address, on June 02, 2008 at 23:38 : In Reply to: Porosity on TOFD inspection posted by : Paulo , E-mail: Address, on June 02, 2008 at 21:20 : Paulo: Acceptance criteria will depend on the Code you work to. Unfortunately too many codes are still trying to make ultrasonic results look like radiography. If you can, with great certainty, declare that a TOFD indication obtained from a single line scan (D-scan) is a cluster of porosity, then your assessment skills and confidence is greater than mine. An upper "tip" signal will be possible with a cluster of pores (it is likely to look like an irregular set of arrival times). The lower boundary of the indication from such a flaw will be VERY difficult to determine. Inter-pore scatter will generate several paths that will be unresolvable from the diffraction off the lowest portion of the flaw. It is permissable in some Codes to assess pores as if they were planar flaws then a length needs to be determined. Ed ----------- Start Original Message ----------- : Hello everybody, : Please I need a help concerning the Porosity on TOFD inspection. I couldn't find a specific criteria for porosity cluster. Can anybody help me? : Thanx! : Paulo ------------ End Original Message ------------ Follow Ups: Re: Porosity on TOFD inspection Paulo 17:44 Jun-03-2008 (1) Re: Porosity on TOFD inspection mustafa GONULAL 15:30 Jun-04-2008 (0) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Paulo: : Acceptance criteria will depend on the Code you work to. Unfortunately too many codes are still trying to make ultrasonic results look like radiography. If you can, with great certainty, declare that a TOFD indication obtained from a single line scan (D-scan) is a cluster of porosity, then your assessment skills and confidence is greater than mine. : An upper "tip" signal will be possible with a cluster of pores (it is likely to look like an irregular set of arrival times). The lower boundary of the indication from such a flaw will be VERY difficult to determine. Inter-pore scatter will generate several paths that will be unresolvable from the diffraction off the lowest portion of the flaw. : It is permissable in some Codes to assess pores as if they were planar flaws then a length needs to be determined. : Ed : : Hello everybody, : : Please I need a help concerning the Porosity on TOFD inspection. I couldn't find a specific criteria for porosity cluster. Can anybody help me? : : Thanx! : : Paulo ------------ 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