Investigation of Ultrasonic Assisted Friction Stir Spot Welding of Magnesium Alloy to Aluminum Alloy
Investigation of Ultrasonic Assisted Friction Stir Spot Welding of Magnesium Alloy to Aluminum Alloy
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DOI：
10.1007/s11223-016-9730-y
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发表时间：
2016-03
影响因子：
0.7
通讯作者：
S. Ji;Z. W. Li;Longxuan Ma;Y. Yue;S. Gao
中科院分区：
文献类型：
--
作者：
S. Ji;Z. W. Li;Longxuan Ma;Y. Yue;S. Gao
提出了一种新的焊接方法：超声辅助搅拌摩擦点焊（UAFSSW）。将UAFSSW成功应用于异种AZ31镁合金和6061铝合金的焊接。结果表明：无论是常规FSSW还是UAFSSW，均能获得较好的上部Mg合金和下部Al合金组合。超声振动有利于下部铝合金的向上流动，有利于搅拌区宽度的增大，有利于搅拌区晶粒的细化。Al-Mg接头的所有截面均在SZ区形成金属间化合物（IMC）。常规FSSW接头的裂纹沿异种材料界面精确扩展，呈现倒v形形貌。到达钩缺陷最高点后，UAFSSW接头裂纹延伸至锁眼处，下部板材上留下部分镁合金。传统的FSSW和UAFSSW接头在接合界面处显示出不同的IMC成分。
A new welding method: ultrasonic assisted friction stir spot welding (UAFSSW) was put forward in the present study. UAFSSW was successfully applied to weld dissimilar AZ31 Mg alloy and 6061 Al alloy. Results show that for either conventional FSSW or UAFSSW, sound joints are obtained with the upper Mg alloy and lower Al alloy configurations. Ultrasonic vibration is beneficial for the upward flow of lower aluminum alloy, the increase of the stir zone (SZ) width and the refinement of the grains in the SZ. All cross sections of the Al–Mg joints exhibit the formation of intermetallic compounds (IMC) in the SZ. The crack of the conventional FSSW joint propagates exactly along the interface between the dissimilar materials and exhibits an inverted V-shaped morphology. After reaching the highest point of the hook defect, crack of the UAFSSW joint extends to the keyhole, leaving a portion of Mg alloy on the lower sheet. Conventional FSSW and UAFSSW joints show different IMC compositions at the faying interface.