Principle of plastic laser welding: two plastic parts to be welded are combined by pressure, and an infrared laser is positioned at the part to be bonded. The laser beam passes through the upper transparent material and is absorbed by the lower material, and the absorbed laser energy is converted into heat energy. Because the two layers of materials are pressed together, the heat energy is transmitted from the absorption layer to the transparent layer, Melt and bond the two layers of material. At the same time, due to the thermal expansion of the material itself, the internal pressure and external pressure work together to ensure the firm welding of the two parts. For the lower layer material that does not absorb light, absorbent needs to be added for treatment.
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