Effect of Surface States on Joining Mechanisms and Mechanical Properties of Aluminum Alloy A5052 and Polyethylene Terephthalate PET by Dissimilar Friction Spot WeldingReport as inadecuate




Effect of Surface States on Joining Mechanisms and Mechanical Properties of Aluminum Alloy A5052 and Polyethylene Terephthalate PET by Dissimilar Friction Spot Welding - Download this document for free, or read online. Document in PDF available to download.

1

Department of Mechanical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia

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Centre of Advanced Manufacturing and Material Processing, University of Malaya, Kuala Lumpur 50603, Malaysia

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Department of System Safety, Nagaoka University of Technology, Nagaoka 940-2188, Japan





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Author to whom correspondence should be addressed.



Academic Editor: Nong Gao

Abstract In this research, polyethylene terephthalate PET, as a high-density thermoplastic sheet, and Aluminum A5052, as a metal with seven distinct surface roughnesses, were joined by friction spot welding FSW. The effect of A5052’s various surface states on the welding joining mechanism and mechanical properties were investigated. Friction spot welding was successfully applied for the dissimilar joining of PET thermoplastics and aluminum alloy A5052. During FSW, the PET near the joining interface softened, partially melted and adhered to the A5052 joining surface. The melted PET evaporated to form bubbles near the joining interface and cooled, forming hollows. The bubbles have two opposite effects: its presence at the joining interface prevent PET from contacting with A5052, while bubbles or hollows are crack origins that induce crack paths which degrade the joining strength. On the other hand, the bubbles’ flow pushed the softened PET into irregularities on the roughened surface to form mechanical interlocking, which significantly improved the strength. The tensile-shear failure load for an as-received surface 0.31 μ m Ra specimen was about 0.4–0.8 kN while that for the treated surface >0.31 μ m Ra specimen was about 4.8–5.2 kN. View Full-Text

Keywords: friction spot welding; surface roughness; dissimilar welding; polyethylene terephthalate PET; aluminum alloy; bubble friction spot welding; surface roughness; dissimilar welding; polyethylene terephthalate PET; aluminum alloy; bubble





Author: Farazila Yusof 1,2,* , Mohd Ridha bin Muhamad 1,2, Raza Moshwan 1,2, Mohd Fadzil bin Jamaludin 1,2 and Yukio Miyashita 3

Source: http://mdpi.com/



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