# Experimental demonstration of creep life improvement in welded joints through optimized welding conditions

https://mdr.nims.go.jp/datasets/7318952d-eccd-4916-8a51-388f4197fb93

## File

- [s40194-025-02288-9.pdf](https://mdr.nims.go.jp/filesets/59ccb5f0-7fb8-4abd-9ed9-cd4e20398b53/download) ([Detail](https://mdr.nims.go.jp/filesets/59ccb5f0-7fb8-4abd-9ed9-cd4e20398b53.md))

## Id

7318952d-eccd-4916-8a51-388f4197fb93

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-06-16T02:38:54.984775Z

## Updated at

2026-06-17T01:25:10.853705Z

## Published at

2026-06-17T03:39:59.345363Z

## Doi



## First published url

https://doi.org/10.1007/s40194-025-02288-9

## Date published

2026-01-30

## Recorded date published

2026-4

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Experimental demonstration of creep life improvement in welded joints through
    optimized welding conditions
  title_type: original
  lang: en

## Description

- description: 'Creep tests were conducted on weld joints under various welding conditions
    to investigate the relationship between welding parameters, HAZ shape, and creep
    performance. The creep life is strongly influenced by stress distribution in the
    fine-grained heat-affected zone (HAZ), which depends on the HAZ shape. A tandem
    Bayesian model was developed, combining a Gaussian process (predicting HAZ shape
    from welding parameters) and Bayesian linear regression (estimating creep life).
    Welding parameters such as number of layers, layer thickness, and heat input were
    optimized to find long-life conditions, achieving a creep life 1.8 times longer
    than the best initial case. Two additional conditions—standard and short-life—were
    also tested. Creep test results followed the expected trend: long > standard >
    short. The differences in HAZ shapes corresponded with the differences in creep
    life. This study demonstrates that creep life can be effectively controlled by
    optimizing welding conditions.'
  description_type: abstract
  lang: und

## Creator

- name: Hitoshi Izuno
  role: author
  orcid: https://orcid.org/0000-0003-0503-3621
  organization: National Institute for Materials Science
- name: Masahiko Demura
  role: author
  orcid: https://orcid.org/0000-0002-7308-3041
  organization: National Institute for Materials Science
- name: Kenji Nagata
  role: author
  orcid: https://orcid.org/0000-0001-9894-4461
  organization: National Institute for Materials Science
- name: Daisuke Abe
  role: author
- name: Keisuke Torigata
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: 2 1/4Cr-1Mo steel
  schema: not_defined
- subject: Weld joint
  schema: not_defined
- subject: Bayesian inference
  schema: not_defined
- subject: Creep property
  schema: not_defined
- subject: Welding condition
  schema: not_defined
- subject: Heat affected zone
  schema: not_defined
- subject: Inverse problem
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2026-01-30

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## Embargo



## Journal

- title: Welding in the World
  issn: '00432288'
  volume: '70'
  issue: '4'
  start_page: 1423
  end_page: 1439

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## Related item



## Funding

- identifier: JPMXP1122684766
  funder_name: 文部科学省
  description: "データ創出・活用型マテリアル研究開発プロジェクト（DxMT）\r\n極限環境構造材料研究拠点（RISME）"

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## Fileset

- id: 59ccb5f0-7fb8-4abd-9ed9-cd4e20398b53
  filename: s40194-025-02288-9.pdf
  content_type: application/pdf
  size: 2193471
  md5: 3f1faa3f160354f20478aa162e0ed1c1

## Thumbnail

fileset_id: 59ccb5f0-7fb8-4abd-9ed9-cd4e20398b53
filename: s40194-025-02288-9.pdf