Welds made by high power laser beam have deep and narrow geometry. Addition of filler wire by the arc source, forming the laser-arc hybrid welding (LAHW) process, is very important to obtain required mechanical properties. Distribution of molten wire throughout the entire weld depth is of concern since it tends to have low transportation ability to the root. Accurate identification of filler metal distribution is very challenging. Metal-cored wires can provide high density of non-metallic inclusions (NMIs) which are important for acicular ferrite nucleation. Accurate filler distribution can be recognized based on statistical characterization of NMIs in the weld. In the present study, it was found that the amount of filler metal decreased linearly towards the root. The filler metal tends to accumulate in the upper part of the weld and has a steep decrease at 45–55 % depth which also has wavy pattern based on longitudinal cuts. Substantial hardness variation in longitudinal direction was observed, where in the root values can reach > 300 HV. Excessive porosity was generated at 75 % depth due to unstable and turbulent melt flow based on morphology of prior austenite grains. The delicate balance of process parameters is important factor for both process stability and filler metal distribution.

高功率激光束焊接的焊缝深而窄。电弧源添加填充焊丝，形成激光电弧混合焊接（LAHW）工艺，对于获得所需的机械性能非常重要。熔融焊丝在整个焊接深度上的分布是值得关注的，因为它往往对根部的输送能力较低。准确识别填充金属分布非常具有挑战性。金属芯线可提供高密度的非金属夹杂物（NMI），这对于针状铁素体成核非常重要。基于焊缝中NMI的统计特征，可以识别出准确的填料分布。在本研究中，发现填充金属的量朝着根部线性减少。填充金属往往会在焊缝的上部堆积，并且在45–55％的深度处会急剧下降，并且基于纵向切割也具有波状图案。观察到纵向硬度有很大变化，其根部值可达到> 300 HV。基于先前奥氏体晶粒的形貌，由于不稳定和湍流的熔体流动，在75％的深度处产生了过多的孔隙。工艺参数的微妙平衡是工艺稳定性和填充金属分布的重要因素。基于先前奥氏体晶粒的形貌，由于不稳定和湍流的熔体流动，在75％的深度处产生了过多的孔隙。工艺参数的微妙平衡是工艺稳定性和填充金属分布的重要因素。基于先前奥氏体晶粒的形貌，由于不稳定和湍流的熔体流动，在75％的深度处产生了过多的孔隙。工艺参数的微妙平衡是工艺稳定性和填充金属分布的重要因素。