The infusible matters in the center of 45AgCuZn solder are one of the primary defects that affected seriously the usability, so the scanning electron microscope is used to analyze them.

• 银铜锌钎焊丝存在中心不熔物是其主要缺陷之一,严重影响其使用效果,采用扫描电镜的方法对45银铜锌焊料进行了分析。