Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches

Ari Koskinen, Jonne Haapalainen, Iikka Virkkunen, Mika Kemppainen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication18th World Conference on Nondestructive Testing, WCNDT
Number of pages8
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event18th World Conference on Non-Destructive Testing, WCNDT - Durban, South Africa
Duration: 16 Apr 201220 Apr 2012

Conference

Conference18th World Conference on Non-Destructive Testing, WCNDT
Abbreviated titleWCNDT
CountrySouth Africa
CityDurban
Period16/04/1220/04/12

Fingerprint

Thermal fatigue
Ultrasonics
Defects
Nondestructive examination
Inspection
Acoustic microscopes
Steel pipe
Austenitic stainless steel
Surface roughness
Fatigue cracks
Cracks
Scanning

Keywords

  • ultrasound
  • ultrasonic inspection
  • C-mode scanning acoustic microscope (C-SAM)
  • thermal fatigue
  • indication
  • discontinuity
  • defect
  • qualification

Cite this

Koskinen, A., Haapalainen, J., Virkkunen, I., & Kemppainen, M. (2012). Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches. In Proceedings : 18th World Conference on Nondestructive Testing, WCNDT
Koskinen, Ari ; Haapalainen, Jonne ; Virkkunen, Iikka ; Kemppainen, Mika. / Differences in Ultrasonic Indications : Thermal Fatigue Cracks and EDM Notches. Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 2012.
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abstract = "Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.",
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Koskinen, A, Haapalainen, J, Virkkunen, I & Kemppainen, M 2012, Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches. in Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 18th World Conference on Non-Destructive Testing, WCNDT, Durban, South Africa, 16/04/12.

Differences in Ultrasonic Indications : Thermal Fatigue Cracks and EDM Notches. / Koskinen, Ari; Haapalainen, Jonne; Virkkunen, Iikka; Kemppainen, Mika.

Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 2012.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.

AB - Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.

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Koskinen A, Haapalainen J, Virkkunen I, Kemppainen M. Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches. In Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 2012