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A Modeling Approach for Plastic-Metal Laser Direct Joining

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Abstract

Laser processing has been identified as a feasible approach to direct joining of metal and plastic components without the need for adhesives or mechanical fasteners. The present work sees development of a modeling approach for conduction and transmission laser direct joining of these materials based on multi-layer optical propagation theory and numerical heat flow simulation. The scope of this methodology is to predict process outcomes based on the calculated joint interface and upper surface temperatures. Three representative cases are considered for model verification, including conduction joining of PBT and aluminum alloy, transmission joining of optically transparent PET and stainless steel, and transmission joining of semi-transparent PA 66 and stainless steel. Conduction direct laser joining experiments are performed on black PBT and 6082 anticorodal aluminum alloy, achieving shear loads of over 2000 N with specimens of 2 mm thickness and 25 mm width. Comparison with simulation results shows that consistently high strength is achieved where the peak interface temperature is above the plastic degradation temperature. Comparison of transmission joining simulations and published experimental results confirms these findings and highlights the influence of plastic layer optical absorption on process feasibility.

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Authors and Affiliations

  1. Dipartimento di Ingegneria e Architettura, Università degli Studi di Parma, Parco Area delle Scienze, 181/A, Parma, Italy

    Adrian H. A. Lutey & Luca Romoli

  2. Dipartimento di Ingegneria Industriale, Università di Bologna, viale Risorgimento, 2, Bologna, Italy

    Alessandro Fortunato & Alessandro Ascari

Authors
  1. Adrian H. A. Lutey
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  2. Alessandro Fortunato
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Correspondence to Adrian H. A. Lutey.

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Lutey, A.H.A., Fortunato, A., Ascari, A. et al. A Modeling Approach for Plastic-Metal Laser Direct Joining. Lasers Manuf. Mater. Process. 4, 136–151 (2017). https://doi.org/10.1007/s40516-017-0042-2

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  • DOI: https://doi.org/10.1007/s40516-017-0042-2

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