Using multiple laser scanner units in Laser Powder Bed Fusion (LPBF) allows a significant increase in productivity compared to single scanner systems. However, the part quality can be affected by the interaction between simultaneous melting processes. This study focuses on part defects caused by the interference between an incident laser beam and the plume ejected from an adjacent melt pool generated by another laser beam. Experiments were conducted on a gantry-based LPBF prototype machine with a movable processing head containing five laser scanner units. The machine includes a camera-based observation system to capture the volumetric propagation of the plume. Within the experiments, multiple laser scanner units were used for simultaneous processing, each generating separate test specimens. A correlation between the occurrence of voids and the plume propagation pattern of an adjacent melt pool is found. The investigations cover two operating modes of the gantry-based LPBF machine. In the jump-and-shoot mode, the processing head is positioned in fixed locations over the powder bed and not moved during exposure. The findings were then transferred to processing with a synchronized movement of the gantry system during exposure (on-the-fly mode). On the basis of this work, suitable multi-scanner processing strategies can be derived to prevent laser-plume interaction between adjacent melt pools.

与单扫描仪系统相比，在激光粉末床融合（LPBF）中使用多个激光扫描仪单元可以显着提高生产率。但是，零件质量会受到同时熔化过程之间相互作用的影响。这项研究的重点是零件的缺陷，这些缺陷是由入射激光束与另一激光束产生的从相邻熔池中喷出的烟流之间的干扰引起的。实验是在基于龙门的LPBF原型机上进行的，该原型机带有可移动的处理头，其中包含五个激光扫描仪单元。该机器包括一个基于摄像头的观察系统，以捕获羽流的体积传播。在实验中，多个激光扫描仪单元用于同时处理，每个单元生成单独的测试样本。发现空隙的发生与相邻熔池的羽流传播模式之间的相关性。研究涵盖了基于龙门的LPBF机器的两种操作模式。在跳拍模式下，处理头位于粉末床上方的固定位置，并且在曝光期间不移动。然后在曝光期间（飞行模式）将发现的结果转移到龙门系统同步移动的处理过程中。在这项工作的基础上，可以得出合适的多扫描仪处理策略，以防止相邻熔池之间的激光-粉末相互作用。处理头位于粉末床上方的固定位置，并且在曝光期间不会移动。然后在曝光期间（飞行模式）将发现的结果转移到龙门系统同步移动的处理过程中。在这项工作的基础上，可以得出合适的多扫描仪处理策略，以防止相邻熔池之间的激光-粉末相互作用。处理头位于粉末床上方的固定位置，并且在曝光期间不会移动。然后在曝光期间（飞行模式）将发现的结果转移到龙门系统同步移动的处理过程中。在这项工作的基础上，可以得出合适的多扫描仪处理策略，以防止相邻熔池之间的激光-粉末相互作用。