采用激光-氩弧复合焊接技术实现了硬质合金与因瓦合金的焊接,采用扫描电镜、能谱仪以及电子探针等研究了焊缝界面的显微组织、化学成分和元素扩散情况.结果表明:激光和氩弧双热源的作用消除了焊缝界面硬质合金侧的η相,同时在因瓦合金侧形成Fe4WC2枝晶;焊缝硬质合金侧的界面元素扩散系数远高于单独使用氩弧焊焊接条件下的,镍、铁元素的最大扩散系数达到22.7 cm2·s-1,最大扩散距离达到200μm.%The joining of cemented carbide and invar alloy was obtained by laser-arc hybrid welding scanning electron microscopy, energy-dispersive spectrometers, electron probe micro analyzer were used to investigate the microstructure, chemical composition and element diffusion near interface. The results show that the combination of laser and arc eliminated η phases which were in the side of cemented carbide of welded seam interface. Fe4 WC2 dendrite crystals were formed in the side of invar alloy. The element diffusion coefficient in the side of cemented carbide was higher than that under the condition of single arc welding. The diffusion coefficient of nickel and iron was up to 22. 7 cm2 · s-1 , maximum arc welding diffusion distance was up to 200 μm.
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