| 镁/铝异种金属填充式摩擦点焊接头特性 |
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| 引用本文： | 封小松,郭立杰,苗玉刚,韩端锋.镁/铝异种金属填充式摩擦点焊接头特性[J].焊接学报,2013(11):41-44. |
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| 作者姓名： | 封小松 郭立杰 苗玉刚 韩端锋 |
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| 作者单位： | 上海航天设备制造总厂, 上海 200245,上海航天设备制造总厂, 上海 200245,哈尔滨工程大学船舶工程学院, 哈尔滨 150001,哈尔滨工程大学船舶工程学院, 哈尔滨 150001 |
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| 基金项目： | 国防基础科研资助项目(A 0320110014) |
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| 摘 要： | 采用填充式摩擦点焊技术对镁/铝异种金属进行工艺试验,并对点焊接头的力学性能和微观组织进行分析.结果表明,当采用合理的搭接接头设计和工艺参数进行镁/铝异种金属摩擦点焊时,可获得表面平整、抗剪切能力强的焊点,其焊点剪切力可达1865 N.组织分析发现,在焊核与镁母材之间的竖直界面处易出现少量的孔洞、微裂纹等缺陷,接头的断裂正发生在该区;而在镁/铝之间的水平界面结合良好,存在一定厚度的界面层组织,且该界面层组织的硬度要比两侧母材的硬度明显高很多,这与摩擦点焊过程中脆硬相的金属间化合物的形成有关.
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| 关 键 词： | 填充式摩擦点焊 异种金属 力学性能 微观组织 |
| 收稿时间： | 2013/7/23 0:00:00 |
Joint characteristics of refill friction spot welding of magnesium/aluminium dissimilar metals |
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| FENG Xiaosong,GUO Lijie,MIAO Yugang and HAN Duanfeng.Joint characteristics of refill friction spot welding of magnesium/aluminium dissimilar metals[J].Transactions of The China Welding Institution,2013(11):41-44. |
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| Authors: | FENG Xiaosong GUO Lijie MIAO Yugang and HAN Duanfeng |
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| Affiliation: | Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, China,Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, China,College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China and College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China |
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| Abstract: | Experiments of refill friction spot welding of Mg/Al dissimilar metals were carried out.The mechanical properties and microstructure of the joints were tested and analyzed.The results showed that the weld spots had smooth appearance and high shear strength,and the shear stress could reach 1865 kN at the proper welding parameters if the lap joints were properly designed.Little cavity and microcracks are found on the nugget/Mg vertical interface,where is the fracture zone.At the horizontal nugget/Al interface with certain thickness,where the microhardness is obviously higher than that of two-side materials, which has some relation with the formation of brittle and hard intermetallics. |
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| Keywords: | refill friction spot welding dissimilar metals mechanical properties microstructure |
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