Abstract: The molten beads of copper wire is prepared by simulated short circuit, and the metallographic phase and quantitative analysis of Cu+Cu2O eutectic is studied. It is found that the metallographic phase of Cu+Cu2O eutectic is different in primary and second molten beads. The content of Cu+Cu2O eutectic in primary spatter molten beads is 15.28% , where it is 5.10% in second spatter molten beads. But the content of the primary molten beads on wire is 0.33%, and 0.19% in second molten bead on wire. The short circuit molten bead can be distinguished by the metallographic phase and content of eutectic, and it is more evidently in spatter molten beads.

Key words: short circuit molten beads, spatter molten beads, Cu+Cu2O eutectic, quantitative analysis of metallographic