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- W2053242550 abstract "Within the plastic industry laser transmission welding ranks among the most important joining techniques and opens upnew application areas continuously. So far, a big disadvantage of the process was the fact that the joining partners needdifferent optical properties. Since thermoplastics are transparent for the radiation of conventional beam sources (800-1100 nm) the absorbance of one of the joining partners has to be enhanced by adding an infrared absorber (IR-absorber).Until recently, welding of absorber-free parts has not been possible.New diode lasers provide a broad variety of wavelengths which allows exploiting intrinsic absorption bands ofthermoplastics. The use of a proper wavelength in combination with special optics enables laser welding of two opticallyidentical polymer parts without absorbers which can be utilized in a large number of applications primarily in themedical and food industry, where the use of absorbers usually entails costly and time-consuming authorization processes.In this paper some aspects of the process are considered as the influence of the focal position, which is crucial when bothjoining partners have equal optical properties. After a theoretical consideration, an evaluation is carried out based onwelding trials with polycarbonate (PC). Further aspects such as gap bridging capability and the influence of thickness ofthe upper joining partner are investigated as well." @default.
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- W2053242550 date "2014-03-06" @default.
- W2053242550 modified "2023-09-23" @default.
- W2053242550 title "Investigations on laser transmission welding of absorber-free thermoplastics" @default.
- W2053242550 cites W3115790077 @default.
- W2053242550 doi "https://doi.org/10.1117/12.2039703" @default.
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