【摘要】 针对钛/钢直接焊接产生脆性金属间化合物从而影响焊接接头的性能的问题，以0.1 mm厚的铌和C7701白铜箔为复合中间层，对2 mm厚的钛和1 mm厚的Q235低碳钢进行电阻点焊，研究了焊接电流和焊接时间对接头熔核直径和力学性能的影响，分析了接头的微观组织。结果表明：当接头熔核为两侧独立熔核时，钢侧熔核和残余Nb之间形成了FeNb金属间化合物和(Nb)固溶体层。当接头熔核为单一混合熔核时，接头形成TiFe+α-Ti的单一混合熔核。随着焊接电流的增大和焊接时间的延长，接头的熔核直径增大，抗剪载荷呈现先增大后减小的变化趋势；当焊接电流为7 kA、焊接时间为300 ms时，接头的抗剪载荷最大，约为7.995 kN。更多还原

【Abstract】 To mitigate the formation of brittle Ti-Fe intermetallic compounds, resistance spot welding of 2 mm thick titanium and 1 mm thick Q235 low-carbon steel was conducted using a 0.1 mm thick composite interlayer consisting of niobium and C7701 white copper foil. The effects of welding current and welding time on nugget diameter and mechanical properties of the joints were investigated, along with microstructural analysis. Results indicated that when nuggets were separated on both sides, a layer comprising FeNb intermetallic compounds and(Nb) solid solution formed between the steel-side nugget and the residual Nb layer. In contrast, a single mixed nugget consisting of TiFe and α-Ti was observed when the joint nugget was unified. With increasing welding current and duration, the nugget diameter expanded, while the shear load first increased and then decreased. The maximum shear load, approximately 7.995 kN, was obtained at 7 kA and 300 ms.更多还原