【摘要】 采用冷金属过渡方法(CMT)对铝和镀锌钢板异种材料进行了熔钎焊连接。使用扫描电镜(SEM)、能谱分析(EDAX)和拉伸试验对焊接接头界面区显微组织及接头性能进行研究。试验结果表明,铝和镀锌钢能得到成形良好的搭接接头。在CMT熔钎焊的方法下,形成了中间厚两边薄的界面区,并且在熔化区一侧边缘形成了富锌区,界面区组织成分也由致密的FeAl3金属间化合物层变为α固溶体和FeAl3化合物混合层,而富锌区是由富铝的α固溶体和残留的铝组成。在进行拉伸试验时,断裂发生在铝母材的热影响区,接头强度为72.09 MPa。更多还原

【Abstract】 Welding-brazing experiment of aluminum and galvanized steel was conducted with cold metal transfer method.The interface microstructure and mechanical property of the joint were analyzed by SEM,EDAX and transverse tensile test.The results indicate that good lap joint between aluminum and galvanized steel sheet can be made in appropriate parameters.The interface turns to be thin from middle to the edge with the components changing from FeAl₃ intermetallics to a compound of α solid solution and FeAl₃ intermetallics.Meanwhile,a rich-zinc zone composed of α solid solution and aluminum at the edge of weld metal exists. In the tensile test,fracture appears in the heat affected zone of aluminum base metal,and its tensile-strength is 72.09 MPa.更多还原