铝/钢异种合金激光-电弧复合焊接接头的界面性能及抗拉强度  

Interfacial properties and tensile strength of laser arc hybrid welded dissimilar Al/steel joint

作　　者：梅述文 成群林[1] 姜勇[1] 胡佩佩[1] 孙锡建 高明[2] 

机构地区：[1]上海航天精密机械研究所,上海201600 [2]华中科技大学武汉光电国家实验室,武汉430074

出　　处：《中国有色金属学报》2015年第2期351-359,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家工信部04专项资助项目(2013ZX04001101)

摘　　要：以铝硅共晶合金Al-12Si为填充材料，采用光纤激光一冷金属过度（CMT）复合焊接技术制备铝／钢异种金属优质对接接头。通过SEM、EDS和XRD分析，结果表明：不锈钢和熔合区界面存在明显的金属间化合物（IMCs）层。从接头上部到下部，IMCs界面层逐渐增厚，并由锯齿状变成板块状。IMCs层通常表现为两层结构，分别为靠近钢基体侧的θ-Fe4（Al，Si）_13层和靠近焊缝侧的ζ-Al8（Fe，Cr）2Si层组成。当激光偏移量为0．4mm时，热输入的优化范围为80～110J／mm。在此范围内，IMCs界面层厚度范围为3～8．5μm，接头抗拉强度大于130MPa，达到铝母材的80％以上。Dissimilar metals of Al alloy to stainless steel was conducted by fiber laser-cold metal transfer （CMT） hybrid welding technique using Al-12Si filler wire. By the analyses of SEM, EDS and XRD, the results show that a IMCs layer is found at the interface between stainless steel and fusion zone. From top to bottom of the joint, the thickness of IMCs layer increases gradually and the shape changes from serrated to plate-like. The IMCs layer is usually composed of two layers, the θ-Fe4（A1,Si）13 layer near to stainless steel and the ζ5-A18（Fe,Cr）2Si layer near to fusion zone. When the offset is 0.4 mm, the optimal range of heat input is 80-110 J/mm. Within this range, the thickness of IMCs layer is 3-8.5 μm, and the tensile strength of the joint is greater than 130 MPa, which is more than 80% of the tensile strength of aluminum base material.

关 键 词：铝合金 不锈钢 金属间化合物 激光-电弧复合焊接 异种连接 

分 类 号：TG457.1[金属学及工艺—焊接]