Dissimilar friction stir spot welding of low carbon steel and Al-Mg alloy by formation of IMCs
Dissimilar friction stir spot welding of low carbon steel and Al-Mg alloy by formation of IMCs
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DOI：
10.1179/136217109x400439
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发表时间：
2009-04-01
影响因子：
3.3
通讯作者：
Jung, S-B
中科院分区：
文献类型：
--
作者：
Lee, C. -Y.;Choi, D. -H.;Jung, S-B
采用搅拌点焊法获得了低碳钢与铝镁合金异种搭接接头。由于工具熔深有限，且焊接工具的销钉高度低于顶侧铺设的铝板厚度，因此在焊核附近没有形成机械混合层。这些焊接条件使得使用由普通工具钢制成的焊接工具焊接钢板成为可能。随着刀具穿透深度(TPD)的增加，接头的拉伸剪切力增大，在TPD为0.5 mm时达到最大值3.0kN，但超过0.5 mm的刀具穿透会导致顶侧铝板的变形。界面观察结果表明，Fe/Al合金之间形成了由多种金属间化合物(IMCs)组成的相互作用层。因此，随着TPD的增加，含有Fe3Al和Fe4Al13金属间化合物的强结合区域的尺寸增大，导致在有限的TPD下接头强度增加。
Dissimilar lap joints of low carbon steel and Al-Mg alloy were obtained by friction stir spot welding. Mechanically mixed layer between top and bottom plates was not formed at the weld nugget due to the limited tool penetration and the pin height of welding tool lower than the thickness of Al plate laid in top side. These welding conditions made it possible to weld steel plate using welding tools made out of a general tool steel. With increasing tool penetration depth (TPD), tensile shear force of joint increased and maximum value of 3.0 kN was obtained at the TPD of 0.5 mm, but excessive tool penetration beyond 0.5 mm was caused in a deformation of Al plate of top side. In the result of interface observation, interaction layer was formed between Fe and Al alloy, which was constituted by various intermetallic compounds (IMCs). Consequently, the size of strongly bonded area containing Fe3Al and Fe4Al13 IMCs increased with TPD, which resulted in the increase in joint strength under the limited TPD.