Correlation between implant test and restraint test

Risto Karppi, Jouko Ruusila, Pekka Rajamäki, Karri Vartiainen

Research output: Book/ReportReport


The paper deals with the correlation between two hydrogen cracking tests for welds (i) a small scale helical notch Implant test and (ii) a semi-full scale Restraint test. The correlation was found to be good and was further improved and explained by recently introduced stress and hydrogen parameters. The study indicated that the scope and applications of the Implant test can be considerably widened.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages24
ISBN (Print)951-38-1267-7
Publication statusPublished - 1981
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports


  • welding
  • weld defects
  • welded joints
  • hydrogen
  • cracking
  • tension tests
  • fracture tests
  • tests


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