铝合金与低碳钢的复合电极电阻点焊接头特性  

Characterization of resistance spot welded joint between aluminum alloy and mild steel with compound electrodes

作　　者：邱然锋[1,2] 李久勇 崔立虎 石红信 

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]有色金属共性技术河南省协同创新中心,洛阳471003

出　　处：《焊接学报》2017年第9期47-50,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(U1204520);河南省国际合作项目(162102410023);河南省高校科技创新人才计划资助项目(16HASTIT050)

摘　　要：针对铝/钢难以焊接这一课题,研发了基于复合电极的电阻点焊新工艺,并对铝合金A6061与低碳钢Q235进行了点焊.介绍了复合电极的设计、制造流程,观察分析了结合界面区反应层形貌及分布等微观组织特点,探讨了焊接电流对熔核尺寸和接头抗剪载荷的影响.在结合界面上观察到了反应层的生成,其厚度随位置的变化而变化.焊接接头熔核直径与抗剪载荷随焊接电流的增加而增大.结果表明,在铝合金与低碳钢的电阻点焊中,镶嵌式复合电极的使用能够起到抑制界面反应层在焊点中央区域生长的效果.The new technology of resistance spot welding with compound electrodes is developed to solve the welding issue of aluminum/steel. Aluminum alloy A6061 and low carbon steel Q235 sheets are welded by this method. The design and manufacturing process of composite electrode were introduced; the interfacial characterization is observed and analyzed. The effect of welding current on the nugget size and tensile shear strength of the joint is investigated. A reaction layer forms at the weld interface; its thickness varies with the position at the weld interface.Both the tensile shear strength and nugget diameter of the joint increase with the increasing of welding current. The results reveal that the growth of interfacial reaction layer can be suppressed by use of compound electrodes in the central region of the weld during resistance spot welding between aluminum alloy and steel.

关 键 词：铝合金 低碳钢 复合电极 电阻点焊 

分 类 号：TG441.2[金属学及工艺—焊接]