Oscillating Laser Conduction Joining of Dissimilar PET to Stainless Steel

How to improve the bonding strength of polymers to metals has been one of the challenges in joining fields. It is generally assumed that laser transmission joining is better than laser conduction joining (LCJ) for transparent polymers, and few studies have been focused on LCJ. However, by introducin...

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Bibliographic Details
Published in:Polymers 2022-11, Vol.14 (22), p.4956
Main Authors: Liao, Wei, Zhao, Suning, Gao, Ming
Format: Article
Language:English
Subjects:
Aluminum alloys
Bonding strength
Chemical reactions
Decomposition
Dissimilar metals
Energy
Energy distribution
Heat
High temperature
Lasers
Molecular chains
Morphology
Polyethylene terephthalate
Polymers
Polymethyl methacrylate
Research methodology
Shear forces
Shear tests
Stainless steel
Stainless steels
Thermal decomposition
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Summary:How to improve the bonding strength of polymers to metals has been one of the challenges in joining fields. It is generally assumed that laser transmission joining is better than laser conduction joining (LCJ) for transparent polymers, and few studies have been focused on LCJ. However, by introducing beam oscillation, an excellent result was obtained in the LCJ of transparent polyethylene terephthalate (PET) to 304 stainless steel. The interface defects of thermal decomposition and bubbles could be eliminated or reduced more efficiently in oscillating laser conduction joining (O-LCJ) rather than transmission joining. Correspondingly, the tensile shear force of joint O-LCJ could be increased by 23.8%, and the plasticity characterized by tensile displacement could be increased by seven times. The improvement mechanism was attributed to two factors by calculating the interface energy distribution and analyzing the force state at the interface. One is the homogenization of interface energy distribution caused by beam oscillation, which decreases the degradation and destruction of polymer macromolecular chains induced by high temperature. The other is the formation of interface bi-directional forces that both inhibit the porosity formation and intensify the chemical reactions. The results bring new insights and provide a new pathway to improve the joining performances of dissimilar polymers to metals.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14224956