Abstract
In the process of laser transmission welding (LTW) polymer with metal film as the laser absorber, few research reports related to the welding interface morphology and the causes have been published. In this study, carbon black coated copper film was selected as the laser absorber for polycarbonate (PC) laser transmission welding. Three typical fracture forms were analyzed and the relevant welding strength and width were also listed. In order to research the welding interface morphology and chemical bond distribution, the morphology of welding interface on the longitudinal section was observed by optical microscope and the tests of scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) on the cross section were performed. Dispersive bubbles and undulated copper film were found around the welding interface. To prove the causes of multiple undulating features, a thermal expansion test and thermal stress simulation analysis were done. The results indicated the expansion of PC has a more significant impact on the form of thermal stresses and the thermal stresses around the laser spot lead to the formation of multiple undulations at the weld.
Published Version
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