Journal
OPTICS AND LASER TECHNOLOGY
Volume 88, Issue -, Pages 205-214Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2016.09.028
Keywords
Joining; Direct bonding; Bonding; Polymers; Diode; LAMP; AISI304; Polycarbonate; Hybrid joint; Morphology; Mechanical characterization; Direct joining
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Laser-Assisted Metal and Plastic bonding (LAMP) of AISI304 sheets with polycarbonate sheets is investigated in this work. The process was performed by means of a high power diode laser with a maximum power of 200 W. The study introduces an integrated experimental approach aimed at understanding how the main process conditions (laser power and scanning speed) influence the direct-bonds quality, dimensions and presence of defects. To this end, the bonds dimension, shear strength, formation and dimension of bubbles in the bonded region were related to the temperature measurements and process parameters. According to the achieved results, the processing window that enables a good adhesion of the two materials is relatively small; this is due the activation of the adhesion phenomena that require overcoming an energy threshold. However, excessive energy levels reduce the bonds strength due to the increase in defects (bubbles) dimension that may combine (coalescence) leading to the formation of a central tunnel where the two substrates are completely detached.
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