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应用扫描电镜、电子探针、透射电镜、Ｘ射线衍射以及压痕实验对硬质合金与胎体金属的界面组织结构与力学性能进行了分析．结果表明：焊接热输入对界面的力学性能影响很大，大的焊接线能量易导致界面缺陷的产生和硬质合金力学性能的降低堆焊焊条中，硬质合金与胎体金属之间仅发生元素的扩散，形成扩散型界面；但堆焊层中，界面附近不仅产生元素的扩散，其中 Ｗ， Ｃｏ， Ｎｉ等元素的扩散较为激烈，而且发生反应，形成扩散型和化合物型混合的界面，增加了界面的结合强度．
The interfacial microstructure and mechanical properties of cemented carbide and matrix metal were analyzed by scanning electron microscopy, electron probe, transmission electron microscopy, X-ray diffraction and indentation test. The results show that the welding heat input has a great influence on the mechanical properties of the interface. The large welding line energy easily leads to the interface defects and the mechanical properties of the cemented carbides decrease. In the surfacing electrode, only between the cemented carbide and the matrix metal occurs Element diffusion, the formation of diffusion-type interface; but surfacing layer, near the interface not only the proliferation of elements, including W, Co, Ni and other elements of the more intense diffusion, and reaction, the formation of diffuse and compound-type interface, Increased the bonding strength of the interface.