TOFD, the emerging ultrasonic technique, for heavy wall pressure vessel welds examination

The paper presents TOFD, the Time of Flight Diffraction Technique, currently the most promising ultrasonic technique for examination of heavy wall thickness welds on pressure vessels. TOFD is a computerized ultrasonic system, able to scan, store, and evaluate indications in terms of height (through...

Full description

Saved in:
Bibliographic Details
Published inE-journal of Nondestructive Testing Vol. 4; no. 9
Main Authors Nardoni, G, Betti, F, Guidi, A, Raffarta, B, Nardoni, P, Nardoni, D, Nottingham, L
Format Journal Article
LanguageEnglish
Published 01.09.1999
Online AccessGet full text

Cover

Loading…
Abstract The paper presents TOFD, the Time of Flight Diffraction Technique, currently the most promising ultrasonic technique for examination of heavy wall thickness welds on pressure vessels. TOFD is a computerized ultrasonic system, able to scan, store, and evaluate indications in terms of height (through thickness weld), length, position, with a degree of accuracy never achieved with other ultrasonic techniques. A record of examined sections is available in unprocessed form on floppy disk or CD and readable in Word for Windows 95. The ASME Code, with Code Case no. 2235 has accepted this method in lieu of radiography examination for thicknesses over 4" (1). Experiences on 75 mm up to 300 mm thick welds of 2.5 /3% Q 1 Mo, 0.25 V and Carbon steel are discussed. The technique has been applied on longitudinal, circumferential and nozzle-shell /bead welds. Scanning Plan Data and its validation are reported with used test blocks. Cladded layers in TOFD images are presented. Based on experience to date, prospects for this new technique are of great interest.
AbstractList The paper presents TOFD, the Time of Flight Diffraction Technique, currently the most promising ultrasonic technique for examination of heavy wall thickness welds on pressure vessels. TOFD is a computerized ultrasonic system, able to scan, store, and evaluate indications in terms of height (through thickness weld), length, position, with a degree of accuracy never achieved with other ultrasonic techniques. A record of examined sections is available in unprocessed form on floppy disk or CD and readable in Word for Windows 95. The ASME Code, with Code Case no. 2235 has accepted this method in lieu of radiography examination for thicknesses over 4" (1). Experiences on 75 mm up to 300 mm thick welds of 2.5 /3% Q 1 Mo, 0.25 V and Carbon steel are discussed. The technique has been applied on longitudinal, circumferential and nozzle-shell /bead welds. Scanning Plan Data and its validation are reported with used test blocks. Cladded layers in TOFD images are presented. Based on experience to date, prospects for this new technique are of great interest.
Author Nardoni, G
Betti, F
Raffarta, B
Nottingham, L
Guidi, A
Nardoni, D
Nardoni, P
Author_xml – sequence: 1
  givenname: G
  surname: Nardoni
  fullname: Nardoni, G
– sequence: 2
  givenname: F
  surname: Betti
  fullname: Betti, F
– sequence: 3
  givenname: A
  surname: Guidi
  fullname: Guidi, A
– sequence: 4
  givenname: B
  surname: Raffarta
  fullname: Raffarta, B
– sequence: 5
  givenname: P
  surname: Nardoni
  fullname: Nardoni, P
– sequence: 6
  givenname: D
  surname: Nardoni
  fullname: Nardoni, D
– sequence: 7
  givenname: L
  surname: Nottingham
  fullname: Nottingham, L
BookMark eNqNjLsOgjAUQBuDifj4hzs5aVJeIrNK3FxYnEiDF6gprfYW1L_XwcHR6Zzh5EyZp43GEfODOErWcRbF3o9P2ILoyjkPt1mUhtxn5-KU71fgWgTs0DZSN9ArZwUZLStwWLVa3ntcQW0stCiGFzyEUnCzSNRbhOFDVPBAdSHAp-ikFk4aPWfjWijCxZcztswPxe64vlnzGZIrO0kVKiU0mp7KMA0Svkl59Hf4BuAkSWM
ContentType Journal Article
DBID 8BQ
8FD
JG9
DatabaseName METADEX
Technology Research Database
Materials Research Database
DatabaseTitle Materials Research Database
Technology Research Database
METADEX
DatabaseTitleList Materials Research Database
DeliveryMethod fulltext_linktorsrc
EISSN 1435-4934
EndPage na
GroupedDBID 8BQ
8FD
ALMA_UNASSIGNED_HOLDINGS
FRP
GROUPED_DOAJ
JG9
ID FETCH-proquest_miscellaneous_271506703
ISSN 1435-4934
IngestDate Sat Aug 17 03:36:11 EDT 2024
IsPeerReviewed false
IsScholarly true
Issue 9
Language English
LinkModel OpenURL
MergedId FETCHMERGED-proquest_miscellaneous_271506703
Notes ObjectType-Article-1
SourceType-Scholarly Journals-1
content type line 23
PQID 27150670
PQPubID 23500
ParticipantIDs proquest_miscellaneous_27150670
PublicationCentury 1900
PublicationDate 19990901
PublicationDateYYYYMMDD 1999-09-01
PublicationDate_xml – month: 09
  year: 1999
  text: 19990901
  day: 01
PublicationDecade 1990
PublicationTitle E-journal of Nondestructive Testing
PublicationYear 1999
SSID ssj0002893720
Score 2.9239423
Snippet The paper presents TOFD, the Time of Flight Diffraction Technique, currently the most promising ultrasonic technique for examination of heavy wall thickness...
SourceID proquest
SourceType Aggregation Database
Title TOFD, the emerging ultrasonic technique, for heavy wall pressure vessel welds examination
URI https://search.proquest.com/docview/27150670
Volume 4
hasFullText 1
inHoldings 1
isFullTextHit
isPrint
link http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwnZ1LS8NAEIAX7cmLKCq-3YN4SSOxTVtz9NFapLYgKdRT2CQTqJQEbNqqv96ZzSZZsVD1EsIS8vp2d2Z3Xoyd-7YV1cIgMFE2O6YtAMecVQcT4LrpW36r5gPFDj_1m92h_ThqjPIK2Sq6JPUvg8-lcSX_oYptyJWiZP9AtrgpNuA58sUjEsbj7xgPOvf0j6RjBsVR0rp_NknfxFQWtikStNJF5E-IM-_8w1iQOVo6wJL1YE7ZwyfGAibh1IB3Qb4xBa18z97UMkz0kzgElXd2DoZLeTqU_KNdZexyiawTVZbtuoU08xoo3IgfZuNw_G0r9VlEEX6iVgk6VMF5pbNVPn2i8mXajtqehCVtas61ta7laMI31uRSbovvD7zOsNfz3PbIXWfr9auGtnJ-zWylVGtHxpGpZ_2QrFJdcLfYptLz-U0GbZutQbzDXghYlSMunuPiJS5e4KpyhMUlLE6weA6LZ7C4hMU1WLvsotN277pm_j4ejl8yyogYktnUq7UoxyPOu3usEicx7DNOpVAEDqGWAMv2bSFwSetEqHqF9SBC4XXAzlbc7HDlFUdsowR4zCrYaeAE1avUP5U_9wvN_jSV
link.rule.ids 315,783,787
linkProvider Directory of Open Access Journals
openUrl ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=TOFD%2C+the+emerging+ultrasonic+technique%2C+for+heavy+wall+pressure+vessel+welds+examination&rft.jtitle=E-journal+of+Nondestructive+Testing&rft.au=Nardoni%2C+G&rft.au=Betti%2C+F&rft.au=Guidi%2C+A&rft.au=Raffarta%2C+B&rft.date=1999-09-01&rft.issn=1435-4934&rft.eissn=1435-4934&rft.volume=4&rft.issue=9&rft.epage=na&rft.externalDBID=NO_FULL_TEXT
thumbnail_l http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=1435-4934&client=summon
thumbnail_m http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=1435-4934&client=summon
thumbnail_s http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=1435-4934&client=summon