Feedback Control of Melt Pool Temperature During Laser Cladding Process
Feedback Control of Melt Pool Temperature During Laser Cladding Process
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DOI：
10.1109/tcst.2010.2093901
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发表时间：
2011-11-01
影响因子：
4.8
通讯作者：
Mazumder, Jyoti
中科院分区：
文献类型：
--
作者：
Song, Lijun;Mazumder, Jyoti
激光熔覆是一个多参数依赖的过程，反馈控制对于过程稳定至关重要。本文提出了一种具有输入约束的广义预测控制策略，以稳定高功率二极管激光熔覆过程中的熔池温度。使用双色高温计来监测熔池温度。使用子空间方法通过实验确定了将激光驱动信号（激光功率）与熔池温度相关的状态空间动态模型。使用状态空间模型实时实现具有输入约束的广义预测控制器。闭环过程能够将熔池温度跟踪到参考温度曲线。在表面不平整的基材上激光熔覆 H13 工具钢表明，闭环工艺能够补偿 40 层沉积后 3 毫米深度的底部填充。
Laser cladding is a multiple-parameter-dependent process, and a feedback control is critical for the process stabilization. This paper presents a generalized predictive control strategy with input constraints to stabilize the melt pool temperature during a high-power diode laser cladding process. A dual-color pyrometer was used to monitor the melt pool temperature. A state-space dynamic model relating the laser drive signal (laser power) to the melt pool temperature was identified experimentally using the subspace method. A generalized predictive controller with input constraints was implemented in real time using the state-space model. The closed-loop process was able to track the melt pool temperature to a reference temperature profile. Laser cladding of H13 tool steel on a substrate with uneven surface showed that the closed-loop process was able to compensate for an under-fill with 3-mm depth after 40-layer depositions.