### Abstract

This paper presents a study on the effect of weld fusion zone angle relative to a round bar cross-weld specimen axis under creep, using three-dimensional finite element analysis with continuum damage mechanics. Creep testing of grade P91 steel pipe has shown that the life of a cross-weld specimen with a 90° angle between the weld fusion line and test axis is significantly higher than those where this angle is lower. The computational results given here demonstrate that the creep model can predict the variation in life due to different weld angles since it considers the specific stress distribution, which is proved to be the controlling factor. Hence, creep properties determined using cross-weld specimens removed from one particular weld joint geometry or at a distinct angle relative to the weld fusion line, can be successfully applied to cases where the angle between the weld fusion line and loading direction is different. However, this angle is indeed significant, therefore it needs to be carefully chosen and recorded so that the results can be interpreted appropriately.

Original language | English |
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Title of host publication | 12th International Conference on Creep and Fracture of Engineering Materials and Structures (CREEP 2012) |

Place of Publication | Kyoto, Japan |

Volume | (CD) |

Publication status | Published - 2012 |

Event | 12th International Conference on Creep and Fracture of Engineering Materials and Structures (CREEP 2012) - Kyoto, Japan Duration: 27 May 2012 → 31 May 2012 |

### Conference

Conference | 12th International Conference on Creep and Fracture of Engineering Materials and Structures (CREEP 2012) |
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Country | Japan |

City | Kyoto |

Period | 27/05/12 → 31/05/12 |

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## Cite this

Tanner, D. W. J., Sun, W., & Hyde, T. H. (2012). The effect of weld fusion zone angle in a cross-weld specimen under creep. In

*12th International Conference on Creep and Fracture of Engineering Materials and Structures (CREEP 2012)*(Vol. (CD)).