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The ABS (acrylonitrile/butadiene/styrene) is a complex mixture consisting of styrene-acrylonitrilecopolymer, a graft polymer of styrene-acrylonitrile and polybutadiene and some unchangedpolybutadiene rubber. The presence of these rubber occlusions makes him inhomogeneous from theoptical point of view. Experimental investigations involved two types of ABS(acrylonitrile/butadiene/styrene) plates. The first component is a natural ABS, semitransparent to thelaser wavelength as it is mentioned above, and the second one is a black pigmented ABS, opaque innear-infrared spectrum. The general optical and thermal characteristics for the two materials are listedin table 1. The values are given at ambient temperature (≈24◦C). For the 2mm thickness ABS naturalplates the transmission coefficient presented in table 1 indicates a strong scattering of the laser beamwith negligible absorption. This conclusion was drawn after infrared measurements of the temperatureraise during its laser irradiation.The experiments were carried out using a diode laser LASERLINE with a maximum outputpower of 100 W and a focal length of 0.150 m. The laser wavelength is 0.940 μm and the focal spot hasa rectangular shape (lx=1.7 mm, ly=1.3 mm).To improve the contact between the two polymers a specially designed clamping device has beenused. The analyzed welding configuration was a T-type geometry for through-transmission laserwelding. The experimental setup is shown in figure 1.The weld failure force was determined with a MTS machine presented in figure 2 with a specialfixture for the T-geometry. The traction speed was 5mm/min.Basics of the process modelling
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