研究目的
Investigating the identification of weld seam interruptions during laser transmission welding of glass fiber reinforced plastics using a pyrometer integrated into a 3D-scanner.
研究成果
The study demonstrates that weld seam interruptions can be clearly identified during welding PA6-GF30/PA6-GF30 using the described measurement configuration, even with small fault zones, small weld seam widths, and thicknesses of the upper joining partner up to 2.2 mm. A temperature difference of 5 °C is adequate as a monitoring criterion for welding parts with a sheet thickness of 1.2 mm, while for 2.2 mm, the criterion has to be increased to 10 °C due to less detected heat radiation.
研究不足
The scattering of heat radiation caused by the fiber reinforcement of the plastics leads to a reduction of the accessible heat radiation, making the identification of gaps considerably more difficult. The study is limited to PA6-GF30 with a glass fiber content of 30 percent (wt.) and a weld seam width of approximately 1 mm.
1：Experimental Design and Method Selection:
The study uses a 3D-scanner with a coaxially coupled pyrometer for in-process monitoring of laser transmission welding. The optical setup is designed using ZEMAX software, considering the spectral characteristics of the optics.
2：Sample Selection and Data Sources:
Injection molded PA6-GF30 samples with notches of different depths are used to create gaps in the joining zone. Two different sheet thicknesses are used for the upper joining partner.
3：List of Experimental Equipment and Materials:
A broadband pyrometer with an InGaAs-detector, a 3D-scanner, and PA6-GF30 samples.
4：Experimental Procedures and Operational Workflow:
The laser beam is guided along the weld trajectory during heating and cooling periods, with the heat radiation measured in both periods. This procedure is repeated until the predefined set-path criterion is reached.
5：Data Analysis Methods:
The temperature signal is analyzed to identify weld seam interruptions, with the position of the temperature signal allocated to the position onto the specimen using a real-time measurement system.
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