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Overlap Friction Stir Welding and Adhesive Bonding AA6082 joints Fatigue
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  • Ricardo Maciel,
  • Tiago Bento,
  • Daniel F. O. Braga,
  • Lucas da Silva ,
  • Pedro Moreira ,
  • Virginia Infante
Ricardo Maciel
IDMEC
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Tiago Bento
IDMEC
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Daniel F. O. Braga
IDMEC
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Lucas da Silva
Universidade do Porto Faculdade de Engenharia
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Pedro Moreira
INEGI
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Virginia Infante
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Abstract

Even though friction stir welding (FSW) has been shown to produce high performing butt-joints, stress concentration at the weld edges in overlap FSW significantly reduces the performance of these joints. By combining FSW and adhesive bonding into a friction stir (FS) weld-bonding, joint mechanical performance is greatly improved. Quasi-static and fatigue strength of the proposed FS weld-bonding joints was assessed and benchmarked against overlap FSW and adhesive bonding. The characterization of the structural adhesive is also presented, including differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), as well as mechanical characterization with curing temperature. A small process parameter study was made to select proper FSW parameters for AA6082-T6 overlap FSW and FS weld-bonded joints. The adhesive degradation temperature (357ºC) was found to be higher than reported temperatures in the adhesive during welding of FS weld-bonding joints. Higher curing temperatures were found to lead to increased strength while decreasing ductility of the adhesive. The addition of adhesive bonding to the overlap FSW to produce FS weld-bonding resulted in a significant increase in quasi-static and fatigue strength, achieving 79.9% of the fatigue strength of adhesive bonded joints at 106 cycles, while FSW had 41.6%.

Peer review status:ACCEPTED

07 Feb 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
11 Feb 2020Submission Checks Completed
11 Feb 2020Assigned to Editor
12 Feb 2020Reviewer(s) Assigned
28 Feb 2020Review(s) Completed, Editorial Evaluation Pending
31 Mar 2020Editorial Decision: Revise Major
12 May 20201st Revision Received
13 May 2020Assigned to Editor
13 May 2020Submission Checks Completed
13 May 2020Reviewer(s) Assigned
26 May 2020Review(s) Completed, Editorial Evaluation Pending
01 Jun 2020Editorial Decision: Revise Minor
01 Jun 20202nd Revision Received
02 Jun 2020Submission Checks Completed
02 Jun 2020Assigned to Editor
02 Jun 2020Reviewer(s) Assigned
02 Jun 2020Review(s) Completed, Editorial Evaluation Pending
04 Jun 2020Editorial Decision: Accept