Note on standardization of Implant test

Risto Karppi, Jouko Ruusila, Kunihiko Satoh, Masao Toyoda, Karri Vartiainen

Research output: Book/ReportReport


Four types of Implant test specimens were used to study the hydrogen induced cracking of steel weldments. Two types of the specimens had a shallow notch with a depth of 0.5 mm but different diameters, one type had a 2 mm deep notch and one type a helical notch with M6-threads. The specimen with the deep notch had many advantages over specimens having the helical or shallow notch. The advances are mainly seen in "mild" tests in which hydrogen cracking may occur only at stress levels considerably above the yield stress of the parent metal. The results with the deep notch specimen can, therefore, be applied to real joints welded under high level of restraint.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages30
ISBN (Print)951-38-1795-4
Publication statusPublished - 1983
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports


  • Implant tests
  • welded joints
  • weldability
  • weld defects
  • cracking
  • standardization


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