研究目的
Investigating the influence of laser power and brazing speed on the thermal cycle and intermetallic layer thickness in high speed laser weld-brazing of aluminium-steel angle joints.
研究成果
The power influences both the maximal temperature and the cooling speed of the thermal cycle, while the brazing speed primarily affects the maximal temperature. The simulation can distinguish process configurations leading to the thickest intermetallic layer, demonstrating its utility in optimizing the weld-brazing process.
研究不足
The study is limited to specific configurations of laser power and brazing speed. The simulation's accuracy is affected by differences between the modeled and actual heat source power distributions.
1：Experimental Design and Method Selection:
The study involves joining AA6016-T4 aluminium and DX56D+Z140M steel sheets using a fluxless laser weld-brazing process with ER4043 AlSi5 filler wire at high brazing speed. Thermal cycles are measured with K-thermocouples and compared to simulated thermal cycles obtained through SYSWELD Software.
2：Sample Selection and Data Sources:
The configuration studied corresponds to typical automotive roof/body-side angle joints.
3：List of Experimental Equipment and Materials:
A 6kW-100mm.mrad diode laser source, optical fiber of 1000μm, ALO3 laser head, ABB robot, K-thermocouples, and SYSWELD Software for simulation.
4：Experimental Procedures and Operational Workflow:
The joining process is fully robotized and automated, with measurements of thermal cycles at the interface and comparison to simulations.
5：Data Analysis Methods:
Thermal cycles are evaluated based on maximal temperature, time of interaction at high temperature, and cooling speed. The theoretical growth of intermetallic compounds is calculated using a diffusion-based model.
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