The influence of the feed rate on the geometry of the capillary and the process stability during laser beam welding of the AlMgSi aluminum alloy AA6082 was investigated by means of online-X-ray videography. Processes at feed rates between 4 m/min and 50 m/min with laser powers of up to 16 kW were considered. The X-ray images were used to generate three dimensional reconstructions of the geometry of the capillary which allowed to calculate the absorptance and the local distribution of the laser irradiance inside of the capillary by means of a ray-tracing approach. The stability of the capillary increased with increasing feed rates, which resulted in the avoidance of both depth fluctuations and processing pores. The stabilization of the capillary is attributed to the change of the capillary’s geometry which leads to a corresponding change of the absorptance of the laser power.

通过在线X射线照相技术研究了进料速率对AlMgSi铝合金AA6082激光束焊接过程中毛细管几何形状和工艺稳定性的影响。考虑了进料速度在4 m / min至50 m / min之间，激光功率高达16 kW的过程。X射线图像用于产生毛细管几何形状的三维重建，其允许通过射线追踪方法来计算毛细管内部的激光辐照度的吸收率和局部分布。毛细管的稳定性随进料速度的增加而增加，从而避免了深度波动和加工孔的产生。