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为了解决铝合金零件激光修复与再制造中的气孔等质量问题,以正交试验规则为基础,采用高吸收率半导体激光在铝合金表面设计了熔覆实验,并采用统计模型进行了优化。结果表明,在有效控制保护气氛的前提下,通过优化工艺参数能够显著的减少熔覆层中的气孔缺陷。基于统计模型模拟的结果显示,适当降低扫描速度有利于减少涂层中气孔的数量。功率变化的影响相对较小,但可以显著影响涂层的成形质量。分析认为这主要与不同条件下熔覆过程中的气泡的排出行为差异有关。
In order to solve the quality problems such as stomata in the laser repair and remanufacturing of aluminum alloy parts, a cladding experiment was designed on the surface of the aluminum alloy based on the orthogonal experiment rules. The laser cladding experiment was carried out on the surface of the aluminum alloy. The statistical model was used to optimize the laser cladding. The results show that under the precondition of effective control of the protective atmosphere, the pore defects in the cladding layer can be significantly reduced by optimizing the process parameters. The results of simulation based on statistical models show that reducing the scanning speed properly can reduce the number of pores in the coating. The effect of power variation is relatively small, but it can significantly affect the quality of the coating forming. The analysis shows that this is mainly related to the difference of bubble discharge behavior under different conditions.