以8.0 mm厚的高氮钢板为试验材料，采用Nd: YAG激光-熔化极活性气体保护焊(Metal Active Gas，MAG)电弧复合焊接方法，研究了单一成分活性剂(TiO2，B2O3，Cr2O3)对复合焊焊缝缺陷的影响。研究表明，在相同的工艺参数下，与无活性剂焊缝相比，活性剂TiO2，B2O3，Cr2O3均能使焊缝形貌得到改善；活性剂TiO2和Cr2O3能增加焊缝熔宽、余高，减小咬边深度，但活性剂B2O3使焊缝熔宽和余高减小，咬边深度增加。无活性剂和有活性剂的高氮钢激光-电弧复合焊焊缝熔合区的气孔数均比焊缝区的气孔数多；而活性剂的加入，增加了焊缝熔合区和焊缝区的气孔数。

Nd:YAG laser-metal active gas(MAG) arc hybrid welding is used to weld the high nitrogen steel plate of 8.0 mm thick. The effects of surfactant (TiO2，B2O3，Cr2O3)on weld defects of hybrid welding are studied. The results show that compared with the weld without surfactant, TiO2，B2O3，Cr2O3 can make weld appearance improved with the same process parameter; TiO2 and Cr2O3 can increase weld width and weld reinforcement and reduce the bit depth, but B2O3 make weld width and weld reinforcement reduced and make the bit depth increased. The porosity in weld fusion zone with surfactant or without surfactant is higher than the porosity of weld area on laser-arc hybrid welding with the high nitrogen steel, and activating fluxes can increase the porosity of both weld fusion zone and weld area.