Stationary shoulder FSW for joining high strength aluminum alloys

Hao Wu; Ying Chun Chen; David Strong; Phil Prangnell

doi:10.1016/j.jmatprotec.2015.02.015

Stationary shoulder FSW for joining high strength aluminum alloys

Hao Wu
, Ying Chun Chen
, David Strong
, Phil Prangnell

Faculty Of Computing, Eng. & Built Env.

University of Manchester

Research output: Contribution to journal › Article › peer-review

101 Citations (Scopus)

Abstract

The new process of 'stationary shoulder' friction stir welding (SSFSW) has been directly compared to conventional (friction stir welding) using welds produced in a high strength AA7050-T7651 aluminium aerospace alloy. The process window for each approach was first compared using torque-rotation rate decay curves. Under optimum process conditions, SSFSW had a ∼30% lower heat input than FSW and the stationary shoulder resulted in narrower welds with a reduced heat affected zone (HAZ) width. The SSFSW welds also had more uniform through thickness properties and performed better than conventional FSWs in cross-weld tensile tests. In addition it is demonstrated that the SSFSW process resulted in a far superior surface finish, although the stationary shoulder led to surface 'speed cracking' under certain welding conditions. The reasons for these benefits are discussed aided by thermal and hardness modelling.

Original language	English
Pages (from-to)	187-196
Number of pages	10
Journal	Journal of Materials Processing Technology
Volume	221
DOIs	https://doi.org/10.1016/j.jmatprotec.2015.02.015
Publication status	Published (in print/issue) - Jul 2015

Bibliographical note

Funding Information:
We are grateful for Dr. J.D. Robson for assistance with the modelling work and financial support provided by EPSRC through LATEST2 , ( EP/G022402/1 ) and the Metallic Systems CDT ( EP/G036950/1 ).

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Funding

We are grateful for Dr. J.D. Robson for assistance with the modelling work and financial support provided by EPSRC through LATEST2 , ( EP/G022402/1 ) and the Metallic Systems CDT ( EP/G036950/1 ).

Keywords

AA7050
Aluminium
Friction stir welding
Stationary shoulder
Thermal modelling

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10.1016/j.jmatprotec.2015.02.015

Cite this

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title = "Stationary shoulder FSW for joining high strength aluminum alloys",

abstract = "The new process of 'stationary shoulder' friction stir welding (SSFSW) has been directly compared to conventional (friction stir welding) using welds produced in a high strength AA7050-T7651 aluminium aerospace alloy. The process window for each approach was first compared using torque-rotation rate decay curves. Under optimum process conditions, SSFSW had a ∼30\% lower heat input than FSW and the stationary shoulder resulted in narrower welds with a reduced heat affected zone (HAZ) width. The SSFSW welds also had more uniform through thickness properties and performed better than conventional FSWs in cross-weld tensile tests. In addition it is demonstrated that the SSFSW process resulted in a far superior surface finish, although the stationary shoulder led to surface 'speed cracking' under certain welding conditions. The reasons for these benefits are discussed aided by thermal and hardness modelling.",

keywords = "AA7050, Aluminium, Friction stir welding, Stationary shoulder, Thermal modelling",

author = "Hao Wu and Chen, \{Ying Chun\} and David Strong and Phil Prangnell",

note = "Funding Information: We are grateful for Dr. J.D. Robson for assistance with the modelling work and financial support provided by EPSRC through LATEST2 , ( EP/G022402/1 ) and the Metallic Systems CDT ( EP/G036950/1 ). Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

year = "2015",

month = jul,

doi = "10.1016/j.jmatprotec.2015.02.015",

language = "English",

volume = "221",

pages = "187--196",

journal = "Journal of Materials Processing Technology",

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AU - Wu, Hao

AU - Chen, Ying Chun

AU - Strong, David

AU - Prangnell, Phil

N1 - Funding Information: We are grateful for Dr. J.D. Robson for assistance with the modelling work and financial support provided by EPSRC through LATEST2 , ( EP/G022402/1 ) and the Metallic Systems CDT ( EP/G036950/1 ). Publisher Copyright: © 2015 Elsevier B.V. All rights reserved. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2015/7

Y1 - 2015/7

N2 - The new process of 'stationary shoulder' friction stir welding (SSFSW) has been directly compared to conventional (friction stir welding) using welds produced in a high strength AA7050-T7651 aluminium aerospace alloy. The process window for each approach was first compared using torque-rotation rate decay curves. Under optimum process conditions, SSFSW had a ∼30% lower heat input than FSW and the stationary shoulder resulted in narrower welds with a reduced heat affected zone (HAZ) width. The SSFSW welds also had more uniform through thickness properties and performed better than conventional FSWs in cross-weld tensile tests. In addition it is demonstrated that the SSFSW process resulted in a far superior surface finish, although the stationary shoulder led to surface 'speed cracking' under certain welding conditions. The reasons for these benefits are discussed aided by thermal and hardness modelling.

AB - The new process of 'stationary shoulder' friction stir welding (SSFSW) has been directly compared to conventional (friction stir welding) using welds produced in a high strength AA7050-T7651 aluminium aerospace alloy. The process window for each approach was first compared using torque-rotation rate decay curves. Under optimum process conditions, SSFSW had a ∼30% lower heat input than FSW and the stationary shoulder resulted in narrower welds with a reduced heat affected zone (HAZ) width. The SSFSW welds also had more uniform through thickness properties and performed better than conventional FSWs in cross-weld tensile tests. In addition it is demonstrated that the SSFSW process resulted in a far superior surface finish, although the stationary shoulder led to surface 'speed cracking' under certain welding conditions. The reasons for these benefits are discussed aided by thermal and hardness modelling.

KW - AA7050

KW - Aluminium

KW - Friction stir welding

KW - Stationary shoulder

KW - Thermal modelling

UR - https://www.scopus.com/pages/publications/84924131458

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DO - 10.1016/j.jmatprotec.2015.02.015

M3 - Article

AN - SCOPUS:84924131458

SN - 0924-0136

VL - 221

SP - 187

EP - 196

JO - Journal of Materials Processing Technology

JF - Journal of Materials Processing Technology

ER -

Stationary shoulder FSW for joining high strength aluminum alloys

Abstract

Bibliographical note

Funding

Keywords

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