Effect of Laser Processing Parameters on the Formation of Intermetallic Compounds in Fe-Al Dissimilar Welding
Effect of Laser Processing Parameters on the Formation of Intermetallic Compounds in Fe-Al Dissimilar Welding
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DOI：
10.1007/s11665-014-1106-5
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发表时间：
2014-09-01
影响因子：
2.3
通讯作者：
McPherson, Norman
中科院分区：
文献类型：
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作者：
Meco, Sonia;Ganguly, Supriyo;McPherson, Norman
由于形成不同类型的Fe-Al金属间化合物（IM），钢与铝的熔焊是困难的。在这项工作中，2毫米厚的钢连接到6毫米铝重叠配置使用8千瓦连续光纤激光器。使用散焦激光束来控制能量输入，并允许仅熔化铝，并通过润湿钢基材形成结合。实验上，通过分别改变功率密度（PD）和相互作用时间来改变工艺能量，以了解这些参数中的每一个对IM形成的影响。据观察，IM形成是PD和相互作用时间的复杂函数。还发现，这种接头的机械强度不能简单地与IM层厚度相关，而是还取决于熔融铝对钢基体的润湿面积。为了形成可行的接头，PD需要超过阈值，其中尽管IM生长将增加，但由于增加的润湿，强度将更好。在PD超过阈值的情况下，相互作用时间的任何增加都将对结合强度产生负面影响。
Fusion welding of steel to aluminum is difficult due to formation of different types of Fe-Al intermetallics (IMs). In this work, 2 mm-thick steel was joined to 6 mm aluminum in overlap configuration using a 8 kW CW fiber laser. A defocused laser beam was used to control the energy input and allow melting of the aluminum alone and form the bond by wetting of the steel substrate. Experimentally, the process energy was varied by changing the power density (PD) and interaction time separately to understand the influence of each of these parameters on the IM formation. It was observed that the IM formation is a complex function of PD and interaction time. It was also found that the mechanical strength of such joint could not be simply correlated to the IM layer thickness but also depends on the area of wetting of the steel substrate by molten aluminum. In order to form a viable joint, PD needs to be over a threshold value where although IM growth will increase, the strength will be better due to increased wetting. Any increase in interaction time, with PD over the threshold, will have negative effect on the bond strength.