Computation of residual stresses for a repair weld case

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

The target of EU FP7 STYLE project (Structural integrity for lifetime management - non-RPV component) was to improve and unify the methods of a structural integrity assessment in the ageing and lifetime management of reactor coolant pressure boundary components. One of the mock-ups in the project was manufactures from two pipes welded together. After completion of the girth weld, a deep weld repair was inserted into the girth weld. As a part of the work, roundrobin finite element computations were performed to determine residual stresses after repair welding and the computational results were compared to the deep hole drilling measurements. In this paper, the details and recomputed results of one of the analyses is presented. A part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with a small strain and displacement formulation. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than the 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 the literature for a repair welding case.
Original languageEnglish
Pages (from-to)507-513
JournalWelding in the World
Volume60
Issue number3
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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Residual stresses
Welds
Repair
Structural integrity
Welding
Mockups
Tensile stress
Coolants
Drilling
Aging of materials
Pipe
Temperature

Keywords

  • finite element analysis
  • residual stresses
  • repair
  • welding

Cite this

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title = "Computation of residual stresses for a repair weld case",
abstract = "The target of EU FP7 STYLE project (Structural integrity for lifetime management - non-RPV component) was to improve and unify the methods of a structural integrity assessment in the ageing and lifetime management of reactor coolant pressure boundary components. One of the mock-ups in the project was manufactures from two pipes welded together. After completion of the girth weld, a deep weld repair was inserted into the girth weld. As a part of the work, roundrobin finite element computations were performed to determine residual stresses after repair welding and the computational results were compared to the deep hole drilling measurements. In this paper, the details and recomputed results of one of the analyses is presented. A part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with a small strain and displacement formulation. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than the 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 the literature for a repair welding case.",
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language = "English",
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Computation of residual stresses for a repair weld case. / Keinänen, Heikki.

In: Welding in the World, Vol. 60, No. 3, 2016, p. 507-513.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Computation of residual stresses for a repair weld case

AU - Keinänen, Heikki

PY - 2016

Y1 - 2016

N2 - The target of EU FP7 STYLE project (Structural integrity for lifetime management - non-RPV component) was to improve and unify the methods of a structural integrity assessment in the ageing and lifetime management of reactor coolant pressure boundary components. One of the mock-ups in the project was manufactures from two pipes welded together. After completion of the girth weld, a deep weld repair was inserted into the girth weld. As a part of the work, roundrobin finite element computations were performed to determine residual stresses after repair welding and the computational results were compared to the deep hole drilling measurements. In this paper, the details and recomputed results of one of the analyses is presented. A part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with a small strain and displacement formulation. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than the 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 the literature for a repair welding case.

AB - The target of EU FP7 STYLE project (Structural integrity for lifetime management - non-RPV component) was to improve and unify the methods of a structural integrity assessment in the ageing and lifetime management of reactor coolant pressure boundary components. One of the mock-ups in the project was manufactures from two pipes welded together. After completion of the girth weld, a deep weld repair was inserted into the girth weld. As a part of the work, roundrobin finite element computations were performed to determine residual stresses after repair welding and the computational results were compared to the deep hole drilling measurements. In this paper, the details and recomputed results of one of the analyses is presented. A part of the input data was generated with in-house codes. Sequential thermal and mechanical analyses were performed with a small strain and displacement formulation. The comparison of computed and measured temperatures and stresses shows good agreement. The computed hoop stress at the repair mid-length was higher than the 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 the literature for a repair welding case.

KW - finite element analysis

KW - residual stresses

KW - repair

KW - welding

U2 - 10.1007/s40194-016-0323-y

DO - 10.1007/s40194-016-0323-y

M3 - Article

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JO - Welding in the World

JF - Welding in the World

SN - 0043-2288

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ER -