| 镁-钢异种金属无匙孔搅拌摩擦点焊过程分析 |
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| 引用本文： | 王希靖,李卫红,赵钢. 镁-钢异种金属无匙孔搅拌摩擦点焊过程分析[J]. 焊接学报, 2014, 35(12): 23-26 |
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| 作者姓名： | 王希靖 李卫红 赵钢 |
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| 作者单位： | 兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室, 兰州 730050 |
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| 基金项目： | 国家自然科学基金资助项目(51265030) |
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| 摘 要： | 在最优焊接参数下,对AZ31B镁板和DP600镀锌钢板进行无匙孔搅拌摩擦搭接点焊试验,得到剪切力达到8.7 k N的接头.整个点焊过程分为插入(I)、搅拌与回抽(II)、回抽完毕(III)三个阶段.显微组织分析表明,焊核区,钢的晶粒细长,流向明显.热力影响区,钢和镁合金均发生动态再结晶,钢的晶粒粗长,镁合金晶粒最为粗大,但在搅拌针回抽区域,镁合金晶粒细小且分布均匀,全部为再结晶等轴晶粒.热影响区,钢的晶粒更为粗长,镁合金的晶粒也较为粗大.接头主元素分析表明,(I)阶段,镁与钢的界面没有发生扩散;(II),(III)阶段,在焊核区主元素之间发生了扩散.
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| 关 键 词： | 无匙孔搅拌摩擦点焊 点焊过程 组织 |
| 收稿时间： | 2013-05-20 |
Process analysis on friction stir spot welding without key hole between magnesium and steel dissimilar alloys |
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| WANG Xijing,LI Weihong and ZHAO Gang. Process analysis on friction stir spot welding without key hole between magnesium and steel dissimilar alloys[J]. Transactions of The China Welding Institution, 2014, 35(12): 23-26 |
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| Authors: | WANG Xijing LI Weihong ZHAO Gang |
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| Affiliation: | State Key Laboratory of Gansu Advanced Non-ferrous Materials, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | The magnesium alloy AZ31B sheet to DP600 galvanized steel sheet were spot welded by friction stir spot welding (FSSW) without keyhole under the condition of the optimal welding parameters. The sound joint with strength of 8. 7 kN was obtained. The whole spot welding process was divided into three phases,pin inserting (I),pin stirring and withdrawing (II), pin withdrawing finished (III). The microstructure analysis showed that in the welding nugget zone,the grain of steel became lathy that flowed significantly. Both the steel and the magnesium alloy in the thermo-mechanically affected zone underwent a dynamic recrystallization process resulting in a coarse grain. The grain of the steel was longer and the grain magnesium alloy became much more coarsened. In the stirring pin withdrawing zone,the grain size of magnesium alloy was small with a uniform distribution. These equiaxed grains were completely transformed. In the heat affected zone,the steel grain was thicker and longer, and the magnesium alloy grain was coarse. The element distribution analysis showed that in the first stage,the interface between magnesium and steel had no diffusion,while in the stage II and stage III,the diffusion of main elements occured in the nugget area. |
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| Keywords: | friction stir spot welding without key hole welding process microstructure |
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