【摘要】 为实现核能设备的轻量化，研究锆合金和钛合金的电阻点焊，并对焊点的成型、焊核的微观组织以及接头的力学性能进行分析。结果表明：由于母材物理性能的差异，熔核呈非对称结构，熔核尺寸与电流正相关，当电流为12 kA时，直径达到6.6 mm。熔核中观察到(Zr, Ti)固溶体，在Ti6Al4V侧形成纵横交错的微小马氏体。接头拉伸表明接头峰值拉剪载荷随着焊接电流的增加而先增大后减小，在电流10 kA时，峰值拉剪载荷达到最大值7.75 kN。而随着焊接电流的增加，接头断裂特征由脆性断裂向塑性断裂转变，断裂破坏模式由界面断裂向拉出断裂转变。更多还原

【Abstract】 In order to achieve the lightweight of nuclear energy equipment, resistance spot welding of zirconium alloy and titanium alloy was studied, and the welding formation, the microstructure of the nugget and the mechanical property of the joint were analyzed. The results indicated that the welding joint appeared as an asymmetric nugget due to the differences in the physical properties of the base metal, and the size of the nugget zone had positive relation with the welding current increasing, the nugget zone diameter reached to 6.6 mm when the welding current was 12 kA.(Zr, Ti) solid solution was observed in the nugget, and the crisscrossing micro-martensite was formed in Ti6Al4V side. The tensile result showed that the peak tensile-shear load first increased and then decreased with the current increasing, the peak tensile-shear load reached the maximum value of 7.75 kN when the welding current reached 10 kA. And the fracture characteristics changed from brittle fracture to plastic fracture, the fracture failure mode changed from interfacial fracture mode to pull-out fracture mode with the increase of current.更多还原