Weld repair simulation for the Mock-up 2 of EU FP7 STYLE Project

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

Abstract

The Mock-up under study is fabricated of austenitic stainless steel with additions of vanadium and niobium to increase its high temperature strength. The Mock-up comprises two pipes welded together to produce a pipe section of 600 mm overall length. After completion of the girth weld, deep weld repair was inserted into the girth weld. Abaqus finite element code was utilised in the welding simulation. Part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with small strain and displacement formulation. In the mechanical analysis, mixed hardening material model and an anneal temperature of 1100°C was assumed. Symmetry conditions were utilised to reduce the size of the model. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than axial stress. Both stresses were tensile through the wall thickness. Confidence in the results was also gained as the results were compared to those presented in literature for a repair welding case.
Original languageEnglish
Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
EditorsPertti Auerkari, Juha Veivo
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages139-151
ISBN (Electronic)978-951-38-8025-5, 978-951-38-8026-2
Publication statusPublished - 2013
MoE publication typeA4 Article in a conference publication
EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 11 Jun 201313 Jun 2013

Publication series

SeriesVTT Technology
Number106
ISSN2242-1211

Conference

ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period11/06/1313/06/13

Fingerprint

Welds
Repair
Welding
Pipe
Austenitic stainless steel
Niobium
Tensile stress
Vanadium
Temperature
Hardening
Hot Temperature

Cite this

Keinänen, H. (2013). Weld repair simulation for the Mock-up 2 of EU FP7 STYLE Project. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants (pp. 139-151). Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 106
Keinänen, Heikki. / Weld repair simulation for the Mock-up 2 of EU FP7 STYLE Project. Baltica IX. International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari ; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 139-151 (VTT Technology; No. 106).
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abstract = "The Mock-up under study is fabricated of austenitic stainless steel with additions of vanadium and niobium to increase its high temperature strength. The Mock-up comprises two pipes welded together to produce a pipe section of 600 mm overall length. After completion of the girth weld, deep weld repair was inserted into the girth weld. Abaqus finite element code was utilised in the welding simulation. Part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with small strain and displacement formulation. In the mechanical analysis, mixed hardening material model and an anneal temperature of 1100°C was assumed. Symmetry conditions were utilised to reduce the size of the model. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than axial stress. Both stresses were tensile through the wall thickness. Confidence in the results was also gained as the results were compared to those presented in literature for a repair welding case.",
author = "Heikki Kein{\"a}nen",
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Keinänen, H 2013, Weld repair simulation for the Mock-up 2 of EU FP7 STYLE Project. in P Auerkari & J Veivo (eds), Baltica IX. International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, no. 106, pp. 139-151, BALTICA IX - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 11/06/13.

Weld repair simulation for the Mock-up 2 of EU FP7 STYLE Project. / Keinänen, Heikki.

Baltica IX. International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. p. 139-151 (VTT Technology; No. 106).

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

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AB - The Mock-up under study is fabricated of austenitic stainless steel with additions of vanadium and niobium to increase its high temperature strength. The Mock-up comprises two pipes welded together to produce a pipe section of 600 mm overall length. After completion of the girth weld, deep weld repair was inserted into the girth weld. Abaqus finite element code was utilised in the welding simulation. Part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with small strain and displacement formulation. In the mechanical analysis, mixed hardening material model and an anneal temperature of 1100°C was assumed. Symmetry conditions were utilised to reduce the size of the model. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than axial stress. Both stresses were tensile through the wall thickness. Confidence in the results was also gained as the results were compared to those presented in literature for a repair welding case.

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Keinänen H. Weld repair simulation for the Mock-up 2 of EU FP7 STYLE Project. In Auerkari P, Veivo J, editors, Baltica IX. International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2013. p. 139-151. (VTT Technology; No. 106).