本文对Ｃｒ—Ｃｒ—Ｃｕ合金材料制造的电极在点焊镀锌钢板时的失效形式进行了分析．结果表明：Ｃｒ—Ｚｒ－Ｃｕ合金材料制造的电极在点焊镀锌钢板时的失效形式主要是电极头部的塑性变形、电极端面的合金化以及再结晶和粘附。点焊镀锌钢板时电极失效的主要原因是Ｃｒ—Ｚｒ—Ｃｕ名金材料的软化温度低，点焊温度下的硬度、强度低和端面的合金化。 In this paper, the failure modes of electrodes made of Cr-Cr-Cu alloy during spot welding of galvanized steel were analyzed. The results show that the failure modes of the electrodes made of Cr-Zr-Cu alloy are mainly plastic deformation of the electrode head, alloying of the electrode faces and recrystallization and adhesion. The main reason for electrode failure when spot welding galvanized steel is that the softening temperature of the Cr-Zr-Cu name-bearing material is low, the hardness at the spot-welding temperature, the strength is low, and the alloying of the end surface.