采用热补偿电阻点焊方法对A6061铝合金与Q235低碳钢进行焊接，探讨了焊接电流、电极压力对接头熔核尺寸和抗剪力的影响，观察分析了熔核界面区反应物形貌及分布等微观组织结构特征。试验结果表明，A6061铝合金与Q235低碳钢采用热补偿电阻点焊方法能在较低的焊接电流条件下获得具有较大熔核与较高抗剪力的点焊接头；接头熔核直径及抗剪力随焊接电流、电极压力的增大而增大；无飞溅条件下接头最大抗剪力为4．25kN，对应的焊接电流为17．5kA；接头界面处生成了主要由Fe2Al5和FeAl3构成的金属间化合物层。
Aluminum alloy A6061 and low carbon steel Q235 sheets were welded using a technique of thermal compensation resistance spot welding. The effects of welding current and electrode pressure on the nugget size and tensile shear strength of the joint were investigated, the interfacial mierostrueture was observed and the feature and distribution of the interracial reactant were analyzed. The results indicate the joint of aluminum alloy A6061 and low carbon steel Q235 with larger nugget and higher tensile shear strength are obtained under relatively low welding current by thermal compensation resistance spot welding method. Both the tensile shear strength and nugget diameter increased with the increasing of welding current and electrode pressure. The joint with the maximum tensile shear load of 4. 25 kN without splash is obtained at the condition of 17.5 kA welding current. Intermetallie layer mainly composed of Fe2Al5 and FeAl3 is formed at the interface of aluminum alloy and steel.
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