【摘要】 通过引入冶金-结构协同调控的第三体，对厚度均为2 mm的AZ31B镁板和Q235钢板进行了电阻点焊，研究了接头的组织与性能。结果表明：当第三体腿径为6 mm,焊接电流为12 kA,焊接时间为200 ms时，可获得最大抗剪强度为7.55 kN的接头，此时接头呈现典型的复合熔核形貌；深入分析发现：冶金调控的第三体熔化状态、熔核模式、断裂模式与焊接参数之间存在显著关联性；进一步研究证实：熔核模式与界面冶金反应层厚度的协同作用，是决定镁/钢电阻点焊接头力学性能的关键因素。更多还原

【Abstract】 Resistance spot welding was carried out on AZ31B magnesium plate and Q235 steel plate with a thickness of 2 mm by introducing a third body for metallurgical structural synergistic regulation, and microstructure and properties of the joints were studied. The results show that when the leg diameter of the third body is 6 mm, the welding current is 12 kA, and the welding time is 200 ms, a joint with a maximum shear strength of 7.55 kN can be obtained, and the joint exhibits a typical composite nugget morphology. Through in-depth analysis, it is found that there is a significant correlation between the melting state of the metallurgically regulated third body, nugget mode, fracture mode and the welding parameters. Further research confirms that the synergistic effect of the nugget mode and the interface metallurgical reaction layer thickness is a key factor determining the mechanical properties of the magnesium/steel resistance spot welding joints.更多还原