研究目的
To examine whether the laser output power of a direct diode laser can be reduced whilst keeping weld seam volumes constant by using a reduced spot diameter in combination with beam oscillation.
研究成果
Using a smaller focal spot diameter in combination with circular beam oscillation significantly increases the process efficiency of laser beam welding, allowing for reduced energy consumption while maintaining weld seam volumes. The potential for energy reduction is higher in the deep-welding regime, indicating the need for further investigation.
研究不足
The study focuses on specific steel types (DC01 and 22MnB5) and does not explore the full potential for higher energies per unit length in the deep-welding regime. Further research is needed to determine the optimum oscillation amplitude and frequency.
1：Experimental Design and Method Selection:
The study compares two configurations of laser beam welding: one with a larger focal spot diameter (664 μm) and linear beam guidance, and another with a smaller focal spot diameter (368 μm) and circular beam oscillation.
2：Sample Selection and Data Sources:
Bead on plate welds are generated using DC01 and 22MnB5 steel, commonly used in automotive applications.
3：List of Experimental Equipment and Materials:
A Trumpf TruDiode direct diode laser with a maximum output power of 4 kW, emitting at wavelengths from 900 nm to 980 nm, is used. Optical fibres and F-Theta lenses are employed to achieve the desired focal spot diameters.
4：Experimental Procedures and Operational Workflow:
Experiments are conducted with feed rates from
5：5 m/min to 5 m/min and laser powers up to 7 kW, with and without beam oscillation. Data Analysis Methods:
Cross-sectional areas of weld seams are compared to evaluate the influence of focal spot diameter and beam oscillation on process efficiency.
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