Effect of external magnetic field on resistance spot welds of aluminum alloy
Effect of external magnetic field on resistance spot welds of aluminum alloy
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DOI：
10.1016/j.matdes.2013.12.005
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发表时间：
2014-04
影响因子：
8.4
通讯作者：
Yang Li;Z. Luo;Y. Fuyu;Duan Rui;Q. Yao
中科院分区：
文献类型：
--
作者：
Yang Li;Z. Luo;Y. Fuyu;Duan Rui;Q. Yao
在双相钢电阻点焊中，外磁场对提高焊接质量有重要作用。然而，公开文献中很少有研究电动势对铝合金电阻点焊的影响。本文研究了不同焊接参数下电动势对铝合金RSW工艺的影响。系统地讨论了电动势对焊缝尺寸、拉伸剪切力、显微组织和显微硬度的影响。结果表明，在电动势作用下，焊缝直径、拉伸剪切力和显微硬度均有一定程度的提高。对于不同的焊接参数，电动势对焊缝性能的敏感性是不同的。电动势效应对焊接时间的变化较为敏感，而对电极力的变化不敏感。电动势的影响随焊接电流的增大而减小。这表明较低的焊接电流和较长的焊接时间可以使电动势的效果更有效。
External magnetic field (EMF) has been demonstrated to have significant effect on the improvement of welding quality in the resistance spot welding (RSW) of dual-phase steel. However, very little work in open literature studied the influence of the EMF on the resistance spot welds of aluminum alloy. In this paper, the effect of EMF on the RSW process of aluminum alloy under different welding parameters is studied. Impacts of the EMF on weld size, tensile shear force, microstructure, and microhardness have been systematically discussed. The results show that under the action of the EMF, the weld diameter, tensile shear force, and microhardness were all improved to certain degree. The sensitivity of the EMF on the weld performance is different for different welding parameters. The effect of EMF is more sensitive to the change of welding time, and insensitive to the change of electrode force. Besides, the effect of EMF is declined with the welding current increased. This indicates that a lower welding current with a long welding time may make the effect of EMF more efficient.