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Defect tolerance of friction stir welds in DH36 steel.

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Title: Defect tolerance of friction stir welds in DH36 steel.
Authors: Stevenson, Ryan1, Toumpis, Athanasios1 athanasios.toumpis@strath.ac.uk, Galloway, Alexander1
Source: Materials & Design. Dec2015, Vol. 87, p701-711. 11p.
Subjects: Friction stir welding, Steel welding, Joints (Engineering), Butt welding, Material fatigue
Abstract: Friction stir welding of steel is in the early stages of development. The aim to commercialise this process creates a trade-off between welding time, cost and quality of the joint produced. Therefore, it becomes critical to analyse the lower quality bound of steel friction stir welds in conventional square edge butt welding configuration. Work has been undertaken to evaluate the microstructure and fatigue performance of 6 mm thick DH36 steel plates friction stir welded with sub-optimal process conditions, resulting in the development of embedded and surface breaking flaws. The defective weldments were characterised to understand the nature of the flaws and a programme of mechanical testing was undertaken (including fatigue assessment) to determine the relationship between the flaw geometry, location and weld quality. A number of characteristic flaws were identified and seen to interact with the samples' fatigue fracture mechanisms. Samples with wormholes at the weld root produced the lowest fatigue performance. Fracture from incomplete fusion paths at the retreating side of the welds' top surface was seen to correspond to the highest recorded fatigue lives. The work provides an insight into the complex nature of characteristic flaws in steel friction stir welds and their interaction with fatigue behaviour. [ABSTRACT FROM AUTHOR]
Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Defect tolerance of friction stir welds in DH36 steel.
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  Data: <searchLink fieldCode="AR" term="%22Stevenson%2C+Ryan%22">Stevenson, Ryan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Toumpis%2C+Athanasios%22">Toumpis, Athanasios</searchLink><relatesTo>1</relatesTo><i> athanasios.toumpis@strath.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Galloway%2C+Alexander%22">Galloway, Alexander</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%26+Design%22">Materials & Design</searchLink>. Dec2015, Vol. 87, p701-711. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Friction+stir+welding%22">Friction stir welding</searchLink><br /><searchLink fieldCode="DE" term="%22Steel+welding%22">Steel welding</searchLink><br /><searchLink fieldCode="DE" term="%22Joints+%28Engineering%29%22">Joints (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Butt+welding%22">Butt welding</searchLink><br /><searchLink fieldCode="DE" term="%22Material+fatigue%22">Material fatigue</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Friction stir welding of steel is in the early stages of development. The aim to commercialise this process creates a trade-off between welding time, cost and quality of the joint produced. Therefore, it becomes critical to analyse the lower quality bound of steel friction stir welds in conventional square edge butt welding configuration. Work has been undertaken to evaluate the microstructure and fatigue performance of 6 mm thick DH36 steel plates friction stir welded with sub-optimal process conditions, resulting in the development of embedded and surface breaking flaws. The defective weldments were characterised to understand the nature of the flaws and a programme of mechanical testing was undertaken (including fatigue assessment) to determine the relationship between the flaw geometry, location and weld quality. A number of characteristic flaws were identified and seen to interact with the samples' fatigue fracture mechanisms. Samples with wormholes at the weld root produced the lowest fatigue performance. Fracture from incomplete fusion paths at the retreating side of the welds' top surface was seen to correspond to the highest recorded fatigue lives. The work provides an insight into the complex nature of characteristic flaws in steel friction stir welds and their interaction with fatigue behaviour. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.matdes.2015.08.064
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 701
    Subjects:
      – SubjectFull: Friction stir welding
        Type: general
      – SubjectFull: Steel welding
        Type: general
      – SubjectFull: Joints (Engineering)
        Type: general
      – SubjectFull: Butt welding
        Type: general
      – SubjectFull: Material fatigue
        Type: general
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      – TitleFull: Defect tolerance of friction stir welds in DH36 steel.
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              Text: Dec2015
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              Y: 2015
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