The wettability and spreadability of weld beads have significant influences on the forming accuracy of spare parts of armored equipments by welding rapid forming technology.The wettability and spreadability was characterized by the weld bead reinforcement,weld width and wetting angle.Effects of contents of FeSi45 and FeS in flux-cored components on wettability and spreadability for weld beads were researched by single weld bead.The transition mode of weld droplets was investigated by high velocity camera.The results indicate that the weld beads have better wettability and spreadability when the quality percent contents of FeSi45 and FeS in flux-cored components are 11.21％ and 0.2％ than other conditions.Under welding conditions with small current,the transition mode of weld droplets keeps big droplet without converting for the addition of FeSi45 and FeS.The transition process is steady,and there are no visible spatters.The superior enthalpy of droplets is important reason,for the good wettability and spreadability of weld beads.%焊缝金属的润湿铺展性对装甲装备备件的焊接快速成形精度具有重要影响.采用焊缝熔宽、余高和润湿角表征焊缝金属的润湿铺展性,通过单道焊试验研究了焊丝药芯成分中FeSi45和FeS的添加量对焊缝金属润湿铺展性的影响规律,采用高速摄像研究了焊丝的熔滴过渡形式.结果表明:药芯成分中FeSi45和FeS的添加量分别为11.21％、0.2％时,可以获得润湿铺展性较好的焊缝；在小电流焊接条件下,药芯中添加FeSi45和FeS不会致使熔滴过渡形式发生改变,仍为大滴过渡,并且熔滴过渡稳定,无明显飞溅；在大滴过渡情况下熔滴的热焓较大,是焊缝金属润湿铺展良好的重要原因.
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