page_title: Laser welding of polymers
section_title: Quasi-simultaneous heating (QSLW)
hierarchical_section_title: Laser welding of polymers / Laser application configurations / Quasi-simultaneous heating (QSLW)
caption_attribution_description: English: This work is based on Figure 26.34. In Benatar, Avraham (2017). Applied Plastics Engineering Handbook (Second Edition). William and Adrew. pp. 575-591
context_page_description: Laser welding of polymers is a set of method used to join polymeric components through the use of a laser. Laser radiation can be generated by CO₂ lasers Nd:YAG lasers, Diode lasers and Fiber lasers. When a laser encounters the surface of plastics, it can be reflected, absorbed or penetrate through the thickness of a component. Laser welding of plastics is based on the energy absorption of laser radiation, which can be reinforced by additives and fillers. Laser welding techniques that have been developed include direct laser welding, laser surface heating, through transmission laser welding and intermediate film welding. Because of high joining speeds, low residual stresses and excellent weld appearances, laser welding processes have been widely used for automotive and medical applications.
context_section_description: In the quasi-simultaneous heating, a work area is irradiated by the use of scanning mirrors. The mirrors raster the laser beam over the entire work area rapidly, creating a simultaneously melted region. Some of the important parameters for this technique include: laser wavelength, laser power, heating time, cooling time, polymer properties.
caption: Laser heating configurations
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