| 外加磁场对铝合金电阻点焊质量的影响 |
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| 引用本文： | 李洋,姚杞,张禹,罗震,郭客.外加磁场对铝合金电阻点焊质量的影响[J].焊接学报,2015,36(12):69-72. |
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| 作者姓名： | 李洋 姚杞 张禹 罗震 郭客 |
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| 作者单位： | 1.天津大学 材料科学与工程学院, 天津 300072 |
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| 基金项目： | 国家自然科学基金资助项目(50975197,51275342) |
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| 摘 要： | 分析了外加磁场对铝合金电阻点焊接头质量的影响,包括熔核尺寸、接头力学性能和微观组织. 结果表明,外加磁场增大了熔核直径、提高了点焊接头的剪切力和吸收能. 在不同工艺参数下,熔核直径增长在5%~25%,剪切拉伸力可提高10%~30%. 在一些焊接参数下,外加磁场可以降低焊接电流、减短焊接时间,从而提高焊接效率、降低能耗. 外加磁场可促进点焊熔核内等轴晶的生成和细化晶粒.当焊接电流很小或很大、焊接时间过短或过长时,都会降低外加磁场的效应. 因此当对点焊施加外磁场时,应在合理的工艺参数下进行,以最大限度地发挥外加磁场的作用.
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| 关 键 词： | 电阻点焊 外加磁场 铝合金 点焊质量 |
| 收稿时间： | 2014/3/6 0:00:00 |
Effect of external magnetic field on aluminum alloy resistance spot welds |
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| LI Yang,YAO Qi,ZHANG Yu,LUO Zhen and GUO Ke.Effect of external magnetic field on aluminum alloy resistance spot welds[J].Transactions of The China Welding Institution,2015,36(12):69-72. |
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| Authors: | LI Yang YAO Qi ZHANG Yu LUO Zhen and GUO Ke |
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| Affiliation: | 1.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China2.School of Chemical Engineering, University of Science and Technology, Anshan 114051, China;Research Institute of Mining Design of the AnSteel Group, Anshan 114001, China |
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| Abstract: | This paper systematically analysis the effect of external magnetic field (EMF) on the nugget size, mechanical properties, and microstructure of aluminum alloy resistance spot welds. The results showed that the nugget diameter, tensile shear force and energy absorption were increased under the help of EMF. Under different welding parameters, the nugget diameter can be increased by 5%~25%, and the tensile shear force can be enhanced by 10%~30%. The EMF can reduce the welding current, shorten the welding time, thereby improves the welding efficiency and reduce energy consumption. The EMF promoted the formation of equiaxed crystal and refined the grain size. Besides, the study also found that both small and larger welding current and short and long welding time will reduce the effect of EMF. Accordingly, in order to maximize the effect of the EMF on resistance spot welds, reasonable welding parameters should be carried out. |
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| Keywords: | resistance spot welding external magnetic field aluminum alloy weld quality |
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